© 2008 Microchip Technology Inc. DS21394D-page 1
TC14433/A
Features:
• Accuracy: ±0.05% of Reading ±1 Count
• Two Voltage Ranges: 1.999V and 199.9 mV
• Up to 25 Conversions Per Second
•Z
IN > 1000M Ohms
• Single Positive Voltage Reference
• Auto-Polarity and Auto -Zero
• Overrange and Underra nge Signals Available
• Operates in Auto-Ranging Circuits
• Uses On-Chip System Clock or External Clock
• Wide Supply Range: ±4.5V to ±8V
Applications:
• Portable Instruments
• Digital Voltmeters
• Digital Panel Meters
• Digital Scales
• Digital Thermometers
• Remote A/D Sensing Systems
Description
The TC14433 is a low-power, high-performance,
monolithic CMOS 3-1/2 digit A/D converter. The
TC14433 combine s both analog an d digital circuits on
a single IC, thus minimizing the number of external
components.
This dual slope A/D converter provides automatic
polarity and zero correction with the addition of two
external resistors and two capacitors. The full scale
voltage range of this ratiometric IC extends from
199.9 millivolts to 1.999 volts. The TC14433 can
operate over a wide range of power supply voltages,
including batteries and standard 5-volt supplies.
The TC14433A features improved performance over
the industry standard TC14433. Rollover, which is the
measurement of identical positive and negative
signals, is specified to have the same reading within
one count for the TC14433A. Power consumption of
the TC14433A is typically 4 mW, approximately one-
half that of the industry standard TC14433.
The TC14433/A is available in 24-Pin PDIP, 24-Pin
SOIC (TC14433 device only), and 28-Pin PLCC
packages.
Package Type
Note 1: NC = No internal connection (In 28-Pin PLCC).
2: 24-Pin SOIC (Wide) package, only for TC14433
device.
1
2
3
4
16
15
14
5
6
7
8
13
19
18
17
9
10
11
12
20
21
22
23
24 VDD
Q3
Q2
Q1
Q0
DS1
DS3
DS2
DS4
EOC
OR
R1
C1
CO1
CO2
R1/C1
CLK0
CLK1
DU
VEE VSS
VAG
VX
VREF
TC14433/A
24-Pin PDIP (Wide)
24-Pin SOIC (Wide)
VREF
NC
VDD
Q3
Q1
Q0
DS2
DS3
DS1
DS4
Q2
VAG
VX
CO1
VEE
CO2
R1/C1
C1
R1
VSS
EOC
NC NC
NC
DU
CLK0
CLK1
19
20
21
22
23
24
25
11
10
9
8
7
6
5
TC14433/A
12 13 14 15 17 18
4 3 2 1 27 2628
16
28-Pin PLCC
OR
3-1/2 Digit, Analog-to-Digital Converter
TC14433/A
DS21394D-page 2 © 2008 Microchip Technology Inc.
Typical Application
3
1
4
5
6
7
8
23
22
21
20
13
9
14
15 19 18 17 16
11 10 2 12 24 4
2
3
5
9
10
11
12
13
14
15
17
6
5
4
3
2
1
10
11
12
13
14
15
16
R1*
VX
20 kΩ
D
CS
R
TC14433
Q
Q
D
C
S
R
+5V -5V
16
+5V +5V Segment
Resistors
150Ω (7)
+5V
Q
Q
-5V
-5V
-5V
-5V 8
Minus Sign
200Ω
51 kΩ
67
+5V
-5V
-5V
-5V
MPS-A12
(4)
Common
Anode Led
Display
MPS-A12
300
RC
14013B
5
3
9
11
1
2
13
12
6
71410
fgedcba
+5V 1µF
48
DS4
DS3
DS2
DS1
-5V
MCP1525
4543B
1413
VIN VOUT
VSS
Plus Sign
110Ω
1µF
0.1 µF**
0.1 µF**
kΩ0.1 µF 0.1 µF
0.1 µF
50 µF
*R1 = 470 kΩ for 2V Range
*R1 = 27 kΩ for 200 mV Range
**Mylar Capacitor
© 2008 Microchip Technology Inc. DS21394D-page 3
TC14433/A
1.0 ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings†
Supply Voltage (VDD – VEE).............. ... ..-0.5V to +18V
Voltage on Any Pin:
Reference to VEE .....................-0.5V to (VDD + 0.5)
DC Current, Any Pin: .. .. ... ............................ ....±10 mA
Power Dissipation (TA ≤ 70°C):
Plastic PLCC .................................................1.0W
Plastic PDIP..............................................940 mW
SOIC.........................................................940 mW
Operating Temperature Range ............-40°C to +85°C
Storage Temperature Range..............-65°C to +160°C
† Notice: Stresses above thos e listed under “Absolute
Maximum Ratings” may cause permanent damage to
the device. These are stress ratings only and functional
operation of the device at these or any other conditions
above those indicated in the operation sections of the
specifications is not implied. Exposure to Absolute
Maximum Rating conditions for extended perio ds may
affect device reliability.
TC14433/A ELECTRICAL SPECIFICATIONS
Electrical Characteristics: Unless otherwise specified, VDD = +5V, VEE = -5V, C1 = 0.1 µF, (Mylar), C0 = 0.1 µF,
RC = 300 kΩ, R1 = 470 kΩ @ VREF = 2V, R1 = 27 kΩ @ VREF = 200 mV, TA = +25°C.
Parameter Symbol Min Typ Max Min Typ Max Units Test Conditions
Analog Input
Rollover Error (Positive) and
Negative Full Scale
Symmetry
SYE -1 — +1 — — — Counts 200 mV Full Scale
VIN -VIN = +VIN
Linearity Output Reading
(Note 1) NL -0.05 +0.05 +0.05 — — — %rdg VREF = 2V
-1 count — +1 count — — — %rdg VREF = 200 mV
Stability Output Reading
(Note 2) SOR — — 2 — — — LSD VX = 1.99V,
VREF = 2V
—— 3 ———LSDV
X = 199 mV,
VREF = 200 mV
Zero Output Reading ZOR — 0 0 — — — LSD VX = 0V, VREF = 2V
Bias Current: Analog Input
Reference Input
Analog Ground
IIN — ±20 ±100 — — — pA
— ±20 ±100 — — — pA
— ±20 ±100 — — — pA
Common mode Rejection CMRR — 65 — — — — dB VX = 1.4V, VREF = 2V,
FOC = 32 kHz
Note 1: Accuracy – The accur acy of the meter at full scale is the accuracy of the setting of the reference voltage. Zero is
recalculated during each conversion cycle. The meaningful specification is linearity. In other words, the deviation from
correct reading for all inputs othe r than positive full scale and zero is defined as the linearity specification.
2: The LSD stability for 200 mV scale is defined as the range that the LSD will occupy 95% of the time.
3: Pin numbers refer to 24-pin PDIP.
TC14433/A
DS21394D-page 4 © 2008 Microchip Technology Inc.
TEMPERATURE SPECIFICATIONS
Digital
Output Voltage
(Pins 14 to 23) (Note 3) VOL — 0 0.05 — — 0.05 V VSS = 0V, “0” Level
— -5 -4.95 — — -4.95 V VSS = -5V, “0” Level
Output Voltage
(Pins 14 to 23) (Note 3) VOH 4.95 5 — 4.95 — — V VSS = 0V, “1” Level
4.95 5 — 4.95 — — V VSS = -5V, “1” Level
Output Current
(Pins 14 to 23) IOH -0.2 -0.36 — -0.14 — — mA VSS = 0V, VOH = 4.6V
Source
- 0.5 -0.9 — -0.35 — — mA VSS = -5V, VOH = 5V
Source
Output Current
(Pins 14 to 23) IOL 0.51 0.88 — 0.36 — — mA VSS = 0V, VOL = 0.4V
Sink
1.3 2.25 — 0.9 — — mA VSS = -5V,
VOL = -4.5V Sink
Clock Frequency fCLK —66—— — — kHzR
C = 300 kΩ
Input Current -DU IDU — ±0.00
001 ±0.3 — — ±1 µA
Power
Quiescent Current:
TC14433A: IQ———————V
DD to VEE, ISS = 0
— 0.4 2 — — 3.7 mA VDD = 5, VEE = -5
— 1.4 4 — — 7.4 mA VDD = 8, VEE = -8
Quiescent Current:
TC14433 ———————V
DD to VEE, ISS = 0
— 0.9 2 — — 3.7 mA VDD = 5, VEE = -5
— 1.8 4 — — 7.4 mA VDD = 8, VEE = -8
Supply Rejection PSRR — 0.5 — — — — mV/V VDD to VEE, ISS = 0,
VREF = 2V,
VDD = 5, VEE = -5
TC14433/A ELECTRICAL SPECIFICATIONS (CONTINUED)
Electrical Characteristics: Unless otherwise specified, VDD = +5V, VEE = -5V, C1 = 0.1 µF, (Mylar), C0 = 0.1 µF,
RC = 300 kΩ, R1 = 470 kΩ @ VREF = 2V, R1 = 27 kΩ @ VREF = 200 mV, TA = +25°C.
Parameter Symbol Min Typ Max Min Typ Max Units Test Conditions
Note 1: Accuracy – The accuracy of the meter at full scale is the accuracy of the setting of the reference voltage. Zero is
recalculated during each conversion cycle. The meaningful specification is linearity. In other words, the deviation from
correct reading for all inputs othe r than positive full scale and zero is defined as the linearity specification.
2: The LSD stability for 200 mV scale is defined as the range that the LSD will occupy 95% of the time.
3: Pin numbers refer to 24-pin PDIP.
Electrical Characteristics: Unless otherwise indicated, VDD = +5V and VEE = -5V.
Parameters Sym Min Typ Max Units Conditions
Temperature Ranges
Operating Temperature Range TA-40 — +85 °C Note
Storage Temperature Range TA-65 — +150 °C
Thermal Package Resistances
Thermal Resistance, 24LD PDIP θJA — 60.5 — °C/W
Thermal Resistance, 24LD CERDIP θJA —N/A—°C/W
Thermal Resistance,24LD SOIC Wide θJA —70—°C/W
Thermal Resistance, 28LD PLCC θJA — 61.2 — °C/W
Note: The internal junction temperature (TJ) must not exceed the absolute maximum specification of +150°C.
© 2008 Microchip Technology Inc. DS21394D-page 5
TC14433/A
2.0 TYPICAL PERFORMANCE CURVES
Note: Unless otherwise specified, VDD = +5V, VEE = -5V, C1 = 0.1 µF, (Mylar), C0 = 0.1 µF, RC = 300 kΩ, R1 = 470 kΩ @ VREF = 2V,
R1 = 27 kΩ @ VREF = 200 mV, TA = +25°C.
FIGURE 2-1: Rollover Error vs. Power
Supply Skew
FIGURE 2-2: Sink Current at VDD = 5V.
FIGURE 2-3: Clock Frequency vs.
Resistor (RC)
FIGURE 2-4: Quiescent Power Supply
Current vs. Ambient Temperature.
FIGURE 2-5: Sink Current at VDD = 5V.
FIGURE 2-6: % Change to Clock
Frequency vs. Ambient Temperature.
Note: The graphs and tables provided following this note are a statistical summary based on a limited number of
samples and are provided for informational purposes only. The performance characteristics listed herein
are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified
operating range (e.g., outside specified pow er supply range) and therefore outside the warranted range.
ROLLOVER ERROR (IN LSD)
AT FULL SCALE
(PLUSE COUNT LESS MINUS COUNT)
-3
-2
-1
0
1
-4 -3 -2 -1
Typical Rollover Error vs. Power Supply Skew
(VDD I-IVEE I) - SUPPLY VOLTAGE SKEW (V)
01234
2
3
4
Note: Rollover Error is the Difference in Output
Reading for the same Analog Input Switched
from Positive to Negative.
0
1
2
3
4
5
01234 5
-40°C
+25°C
+85°C
Typical N-Channel Sink Current at VDD – VSS = 5 Volts
I
D
- SINK CURRENT (mA)
V
DS
- DRAIN TO SOURCE VOLTAGE (V
DC
)
1M
10k
10kΩ100kΩ1MΩ
100k
CLOCK FREQUENCY
16,400 ±1.5%
CONVERSION RATE =
Typical Clock Frequency vs. Resistor (R
C
)
I
CLK
- CLOCK FREQUENCY (Hz)
R
C
- CLOCK FREQUENCY RESISTOR
Note: ±5% Typical Variation over
Supply Voltage Range
of ±4.5V to ±8V
CLOCK FREQUENCY
80
MULTIPLEX RATE =
Typical Quiescent Power Supply Current vs.Temp.
I
Q
- QUIESCENT CURRENT (mA)
T
A
- TEMPERATURE (°C)
0
1
2
3
4
-40 -20 0 20 40 60 80 10
0
V
EE
= -8V
V
DD
= +8V
V
EE
= -5V
V
DD
= +5V
0
-1
-2
-3
0-1-2-3-4-5
Typical P-Channel Sink Current at V
DD
– V
SS
= 5 Volts
I
D
- SINK CURRENT (mA)
V
DS
- DRAIN TO SOURCE VOLTAGE (V
DC
)
-40°C
+25°C
+85°C
4
3
2
1
0
-1
-2
-3
-4
-40 -20 0 20 40 60 80
Normalized at 25°C
±5V Supply
±8V Supply
I
CLK
- CLOCK FREQUENCY
(% CHANGE)
Typical % Change fo Clock Frequency vs. Temp.
CLOCK FREQUENCY
16,400 ±1.5%
CONVERSION RATE =
CLOCK FREQUENCY
80
MULTIPLEX RATE =
T
A
- TEMPERATURE (°C)
TC14433/A
DS21394D-page 6 © 2008 Microchip Technology Inc.
3.0 PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 3-1.
TABLE 3-1: PIN FUNCTION TABLE
Pin No.
24-Pin PDIP,
SOIC
Pin No.
28-Pin
PLCC Symbol Description
12V
AG This is the analog ground. It has a high input impedance. The pin determines
the reference level for the unknown input voltage (V X) and the reference
voltage (VREF).
23V
REF Reference voltage – Full scale output is equal to the voltage applied to VREF.
Therefore, full scale voltage of 1.999V requires 2V reference and 199.9 mV
full scale requires a 200 mV reference. VREF functions as system reset also.
When switched to VEE, the system is reset to the beginning of the
conversion cycle.
34V
XThe unknown input voltage (VX) is measured as a ratio of the reference
voltage (VREF) in a ratiomet ri c A/D conv e rsi o n.
45R
1This pin is for external components used for the integration function in the
dual slope conversion. Typical values are 0.1 µF (Mylar) capacitor for C1.
56R
1/C1R1 = 470 kΩ (resistor) for 2V full scale.
67C
1R1 = 27 kΩ (resistor) for 200 mV full scale. Clock frequency of 66 kHz gives
250 ms conversion time.
79CO
1These pins are used for connecting the offset correction capacitor. The
recommended value is 0.1 µF.
810CO
2These pins are used for connecting the offset correction capacitor. The
recommended value is 0.1 µF.
9 11 DU Display update input pin. When DU is connected to the EOC output, every
conversion is displayed. New data will be strobed into the output latches
during the conversion cycle if a positive edge is received on DU, prior to the
ramp down cycle. When this pin is driven from an external sourc e, the
voltage should be referenced to VSS.
10 12 CLK1Clock input pins. The TC14433 has its own oscillator system clock.
Connecting a single resistor between CLK1 and CLK0 sets the clock
frequency.
11 13 CLK0A crystal or OC circuit may be inserted in lieu of a resistor for improved
CLK1, the clock input, can be driven from an external clock source, which
need only have standard CMOS output drive. This pin is referenced to VEE
for external cl ock i npu t s . A 3 00 kΩ resistor yields a clock frequency of about
66 kHz. See Section 2.0 “Typical Performance Curves”. (Also see
Figure 5-3 for alternate circuits.)
12 14 VEE Negative power current. Connection pin for the most negative supply. Please
note the current for the output drive circuit is returned through VSS. Typical
supply current is 0.8 mA.
13 16 VSS Negative power supply for output circuitry. This pin sets the low voltage level
for the output pins (BCD, Digit Selects, EOC, OR). When connected to
analog ground, the output voltage is from analog ground to VDD. If
connected to VEE, the output swin g is from VEE to VDD. The recommended
operating range fo r VSS is between the VDD -3 volts and VEE.
14 17 EOC End of conversion output generates a pulse at the end of each conversion
cycle. This generated pulse width is equal to one half the period of the
system clock.
15 18 OR Overrange pin. Normally this pin is set high. When VX exceeds VREF the OR
is low.
© 2008 Microchip Technology Inc. DS21394D-page 7
TC14433/A
16 19 DS4Digit select pin. T he dig it sele ct output goes high when the respective digit is
selected. The MSD (1/2 digit turns on immediately after an EOC pulse).
17 20 DS3The remaining digits turn on in sequence from MSD to LSD.
18 21 DS2To ensure that the BCD data has settled, an inter digit blanking time of two
clock periods is included.
19 23 DS1Clock frequency divided by 80 equals multiplex rate. For example, a system
clock of 60 kHz gives a multiplex rate of 0.8 kHz.
20 24 Q0See Figure 5-4 for digit sele ct timing diagram.
21 25 Q1BCD data output pin. Multiplexed BCD outputs contain three full digits of
information during digit select DS2, DS3, DS4.
22 26 Q2During DS1, the 1/2 digit, overrange, underrange and polarity information is
available.
23 27 Q3Refer to the Truth Table 5-1.
24 28 VDD Positive power supply. This is the most positive power supply pin.
— 1 NC Not Used.
— 8 NC Not Used.
— 15 NC Not Used.
— 22 NC Not Used.
TABLE 3-1: PIN FUNCTION TABLE (CONTINUED)
Pin No.
24-Pin PDIP,
SOIC
Pin No.
28-Pin
PLCC Symbol Description
TC14433/A
DS21394D-page 8 © 2008 Microchip Technology Inc.
4.0 DETAILED DESCRIPTION
The TC14433 CMOS IC becomes a modified dual-
slope A/D with a minimum of external components.
This IC has the customary CMOS digital logic circuitry,
as well as CMOS analog circuitry. It provides the user
with digital functions such as (counters, latches,
multiplexers), and analog functions such as
(operational amplifiers and comparators) on a single
chip. Refer to the Functional Block diagram, Figure 4-3.
Features of the TC14433/A include auto-zero, high
input impedances and auto-polarity. Low power
consumption and a wide range of power supply
voltages are also advantages of this CMOS device.
The system’s auto-zero function compensates for the
offset voltage of the internal amplifiers and compara-
tors. In this “ratiometric system,” the output reading is
the ratio of the unknown voltage to the reference
voltage, where a ratio of 1 is equal to the maximum
count of 1999. It takes approximately 16,000 clock
periods to complete one conversion cycle. Each
conversion cycle may be divided into 6 segments.
Figure 4-1 shows the conversion cycle in 6 segments
for both positive and negative inputs.
i
FIGURE 4-1: Integrator Waveforms at
Pin 6.
Segment 1 – The offset capacitor (CO), which compen-
sates for the input offset voltages of the buffer and
integrator amplifiers, is charged during this period.
However, the integrator capacitor is shorted. This
segment requires 4000 clock periods.
Segment 2 – During this segment, the integrator output
decreases to the comparator threshold voltage. At this
time, a number of counts equivalent to the input o ffset
voltage of the comparator is stored in the offset latches
for later use in the auto-zero process. The time for this
segment is variable and less than 800 clock periods.
Segment 3 – This segment of the conversion cycle is
the same as Segment 1.
Segment 4 – Segment 4 is an up going ramp cycle with
the unknown input voltage (VX as the input to the
integrator. Figure 4-2 shows the equivalent
configuration of the analog section of the TC14433.
The actual configuration of the analog section is
dependent upon the polarity of the input voltage during
the previous conversion cycle.
FIGURE 4-2: Equivalent Circuit Diagrams
of the Analog Section Durin g Seg men t 4 of the
Timing Cycle
Segment 5 – This segment is a down-going ramp
period with the reference voltage as the input to the
integrator. Segment 5 of the conversion cycle has a
time equal to the numbe r of counts stored in the offset
storage latches during Segment 2. As a result, the
system zeros automatically.
Segment 6 – This is an extension of Segment 5. The
time period for this portion is 4000 clock periods. The
results of the A/D conversion cycle are determined in
this portion of the conversion cycle.
Start
123456
Typical
Positive
Input Voltage
Typical
Negative
Input Voltage
Time
Segment
Number
End
VX
VX
C1
Comparator
R1
Buffer Integrator
+
–
+
–
+
–
VX
© 2008 Microchip Technology Inc. DS21394D-page 9
TC14433/A
FIGURE 4-3: Functional Block Diagram.
Latches
1s' 10s' 100s' 1,000s'Clock
RC
Control Logic CMOS
Analog Subsystem
Display
Update 9
DU
End of
Conversion
EOC
14
R1R1/C C1
456CO1CO2
78
2
1
3
VREF
VAG
VX
Reference Voltage
Analog Ground
Analog Input
Offset
Polarity Detect
10
CLK111
CLK0
OR Overrange
Multiplexer
TC14433/A
20-23
16 -19 DS1 – DS4
Digit Strobe
Q – Q3
BDC Data
Integrator
15
Overflow
VDD = Pin 24
VSS = Pin 13
VEE = Pin 12
TC14433/A
DS21394D-page 10 © 2008 Microchip Technology Inc.
5.0 TYPICAL APPLICATIONS
The typical application circu it is an example of a 3-1/2
digit voltmeter using the TC14433 with Common-
anode displays. This system requires a 2.5V reference.
Full scale may be adjusted to 1.999V or 199.9 mV.
Input overrange is ind icated by flash ing a disp lay. This
display uses LEDs with common anode digit lines.
Power supply for this system is shown as a dual ±5V
supply; however , the TC14433 will operate over a wide
voltage range
The circuit in Figure 5-1 shows a 3-1/2 digit LCD
voltmeter. The 14024B provides the low frequency
square wave signal drive to the LCD backplane. Dual
power supplies are shown here; however, one supply
may be used when VSS is connected to VEE. In this
case, VAG must be at least 2.8V above VEE.
When only segments b and c of th e decoder are con-
nected to the 1/2 digit of the display, 4, 0, 7 and 3
appear as 1.
The overrange indication (Q3 = 0 and Q0 = 1) occurs
when the count is greater than 1999; (e.g., 1.999V for
a reference of 2V) The underrange indication, useful for
auto-ranging circuits, occurs when the count is less
than 180; (e.g., 0.180V for a reference of 2V).
TABLE 5-1: TRUTH TABLE
Figure 5-2 is an example of a 3-1/2 digit LED voltmeter
with a minimum of external components, (only 11
additional components). In this circuit, the 14511B
provides the segment drive and the 75492 or 1413
provides sink for digit current. Display is blanked during
the overrange condition.
Note: If the most significant digit is connected to
a display other than a “ 1” only, such as a
full digit display, segments other than b
and c must be disconnected. The BCD to
7-segment decoder must blank on BCD
inputs 1010 to 1111 (see Table 5-1).
Coded
Condition
of MSD
Q
3
Q
2
Q
1
Q
0
BDC to 7-Segm en t
Decoding
+01110 Blank
Blank
Blank
Blank
-01010
+0 UR 1111
-0 UR 1011
+101004 – 1
0 – 1
7 – 1
3 – 1
Hook up
only segments
b and c to MSD
-10000
+1 OR 0111
-1 OR 0011
Note 1: Q3 – 1/2 digit, low for “1”, high for “0”.
Q2 – Polarity: “1” = positive, “0” = negative.
Q0 – Out of range condition exists if Q0 = 1.
When used in conjunction with Q3, the type
of out of range condition is indicated; i.e.,
Q3= 0 → OR or Q3 = 1 → UR.
© 2008 Microchip Technology Inc. DS21394D-page 11
TC14433/A
FIGURE 5-1: 3-1/2 Digit Voltmeter with LCD Display.
C01C02
RC
R1
VX
VAG
VREF
VDD VSS VEE EOEDU
14013B
DS4
DS3
DS2
DS1
Q0
Q1
Q2
Q3
300 kΩ
470 kΩ
-V
-V
14013B
+V
+V
14543B +V
14070B
1/4 1/2 Digit
Plus
Sign
Minus
Sign
14070B 1/4
1/4 14070B
-V 14024B
C
R
+V
D
CRR
D
CRR+V
-V
TC14433
MCP1525
VIN
V+
VOUT
VSS
1µF
20
0.1 µF 0.1 µF
R1/C1C1
Q
Q
Q
Q
g f e d c b a
BI D C B A Ph LD
14543B
+V
-V
g f e d c b a
BI D C B A Ph LD
+V
14543B
-V
g f e d c b a
BI D C B A Ph LD
kΩ
TC14433/A
DS21394D-page 12 © 2008 Microchip Technology Inc.
FIGURE 5-2: 3-1/2 Digit LED Voltmeter with Low Component Count Using Common Cathode
Display.
FIGURE 5-3: Alternate Oscillator Circuits.
Note 1: For VREF = 2000V; V: 1.999V full scale.
2: For VREF = 200 mV; V: 199.9 mV full scale (change 470 kΩ to R = 27 kΩ and decimal point position.
3: Peak digit current for an eight displayed is 7 times the segment current:
*To increase segment current capability, add two 75491 ICs between 14511B and resistor network.
The use of the 1413 as digit driver increases digit current capability over the 75492.
**V can range between -2.8V and -11V.
CLK1
CLK0
OR
TC14433
Input
VX300 kΩResitor Network
or Individual
Resistor* R
+5V
Minus
Control
+5V
RM
Common
Cathode
Led Display
75492
OR
1413*
Digit Drivers
VEE**
(Minus)
Alternate Overrange Circuit
with Separat ed LED
+5VOR 1/6
1/7 1413
75492 RR
OR
B1
A
B
C
D
LT
LE
I4511B
RDP
VIN
+5V
VOUT
VSS
1µF
20kΩ
MCP1525
470 kΩ0.1 µF 0.1 µF
C01C02
R1R1/C C1
VX
VAG
DU
EOE
VREF
VSS
VSS
VDD VDD
VEE
Q0
Q1
Q2
DS4DS3DS2DS1
a
b
c
d
e
f
g
(B) LC Oscillator Circuit
10
LC
11
C
For L = 5 mH and C = 0.01 µF @ 22.5 kHz10 pF < C1 and C2 < 200 pF
TC14433
TC14433
CLK1
C1
C2
CLK0
CLK1
CLK0
11
10
18 MΩ
47 kΩ
(A) Crystal Oscillator Circuit
f1
2πLC
------------------=
© 2008 Microchip Technology Inc. DS21394D-page 13
TC14433/A
FIGURE 5-4: Digit Select Timing Diagram.
EOC 1/2 Clock Cycle
18 Clock Cycles
2 Clock Cycles
16,400 Clock Cycles
Between EOC Pulses
DS1
1/2 Digit
(MSD)
DS2
DS3
DS4
LCD
ª
TC14433/A
DS21394D-page 14 © 2008 Microchip Technology Inc.
6.0 PACKAGING INFORMATION
6.1 Package Marking Information
Legend: XX...X Customer-specific information
Y Year code (last digit of calendar year)
YY Year code (last 2 digits of calendar year)
WW Week code (week of January 1 is week ‘01’)
NNN Alphanumeric traceability code
Pb-free JEDEC designator for Matte Tin (Sn)
*This package is Pb-free. The Pb-free JEDEC designator ( )
can be found on the outer packaging for this package.
Note: In the event the full Microchip part number cannot be marked on one line, it will
be carried over to the next line, thus limiting the number of available
characters for customer-specific information.
3
e
3
e
24-Lead PDIP
XXXXXXXXXXXXXX
XXXXXXXXXXXXXX
YYWWNNN
XXXXXXXXXXXXXX
24-Lead SOIC (.300”)
XXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXX
YYWWNNN
28-Lead PLCC
XXXXXXXXXX
XXXXXXXXXX
YYWWNNN
Example:
Example:
Example:
TC14433EPG^^
0814256
TC14433EOG^^
0814256
TC14433
ELI^^
0814256
3
e
3
e
© 2008 Microchip Technology Inc. DS21394D-page 15
TC14433/A
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%DVHWR6HDWLQJ3ODQH $  ± ±
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0ROGHG3DFNDJH:LGWK (  ± 
2YHUDOO/HQJWK '  ± 
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/HDG7KLFNQHVV F  ± 
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2YHUDOO5RZ6SDFLQJ H% ± ± 
E1
N
NOTE 1
123
D
A
A1 b1
b
L
A2
e
E2
c
eB
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TC14433/A
DS21394D-page 16 © 2008 Microchip Technology Inc.
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0ROGHG3DFNDJH7KLFNQHVV $  ± ±
6WDQGRII $  ± 
2YHUDOO:LGWK ( %6&
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)RRWSULQW / 5()
)RRW$QJOH  ± 
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D
N
E
E1
NOTE 1
123
b
e
A
A1
A2
h
h
c
L
L1
α
β
φ
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© 2008 Microchip Technology Inc. DS21394D-page 17
TC14433/A
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6WDQGRII $  ± ±
&RUQHU&KDPIHU &+  ± 
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D
CH2 x 45°
D1
NOTE 1 N123
E
E1
CH1 x 45°
CH3 x 45°
AA1
A3
E2
b
b1
A2
c
e
D2
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TC14433/A
DS21394D-page 18 © 2008 Microchip Technology Inc.
6.2 Taping Form
Carrier Tape, Number of Components Per Reel and Reel Size
Package Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size
24-Lead PLCC 24 mm 16 mm 750 330 mm
Component Taping Orientation for 28-Lead PLCC Devices
Standard Reel Component Orientation
for 713 Suffix Device
© 2008 Microchip Technology Inc. DS21394D-page 19
TC14433/A
APPENDIX A: REVISION HISTORY
Revision D (July 2008)
The following is the list of modificatio ns:
1. Changed Operating Temperature in Absolute
Maximum Ratings to -40°C to +85°C.
2. Added Packaging Marking information.
3. Added Package Outline Drawings.
4. Added Appendix A: “Revision History”
5. Added “Product Iden tification System”.
Revision C (January 2006)
• Undocumented changes
Revision B (May 2002)
• Undocumented changes
Revision A (March 2001)
• Original Release of this Document.
TC14433/A
DS21394D-page 20 © 2008 Microchip Technology Inc.
NOTES:
© 2008 Microchip Technology Inc. DS21394D-page 21
TC14433/A
PRODUCT IDENTIFICATION SYSTEM
To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office.
Device: TC14433: 3 1/2 Digit, A/D Converter
TC14433T: 3 1/2 Digit, A/D Converter
(Tape and Reel)
TC14433A: 3 1/2 Digit, A/D Converter
TC14433AT: 3 1/2 Digit, A/D Converter
(Tape and Reel)
Temperature Range: E = -40°C to +85°C
Package: LI = Plastic Leaded Chip Carrier, Square, 28-lead
PG = Plastic Dual In-Line, 600 mil Body, 24-lead
OG = Plastic Small Outline, Wide 7.50 mm, 24-l ead
PART NO. X/XX
PackageTemperature
Range
Device
Examples:
a) TC14433ELI: 24LD PLCC package.
b) TC14433TELI: Tape and Reel,
24LD PLCC package.
c) TC14433EPG: 24LD PDIP package.
d) TC14433TEPG: Tape and Reel,
24LD PDIP package.
e) TC14433EOG: 24LD SOIC package.
f) TC14433TEOG: Tape and Reel,
24-LD SOIC package.
a) TC14433AELI: 28LD PLCC package.
b) TC14433ATELI: Tape and Reel,
28LD PLCC package.
c) TC14433AEPG: 24LD PDIP package.
d) TC 14433ATEPG: Tape and Reel,
24LD PDIP package.
e) TC14433AEOG: 24LD SOIC package.
f) TC14433ATEOG: Tape and Reel,
24-LD SOIC package.
TC14433/A
DS21394D-page 22 © 2008 Microchip Technology Inc.
NOTES:
© 2008 Microchip Technology Inc. DS21394D-page 23
Information contained in this publication regarding device
applications and the like is provided only for your convenience
and may be superseded by updates. It is your responsibility to
ensure that your application meets with your specifications.
MICROCHIP MAKES NO REPRESENTATIONS OR
WARRANTIES OF ANY KIND WHETHER EXPRESS OR
IMPLIED, WRITTEN OR ORAL, STATUTORY OR
OTHERWISE, RELATED TO THE INFORMATION,
INCLUDING BUT NOT LIMITED TO ITS CONDITION,
QUALITY, PERFORMANCE, MERCHANTABILITY OR
FITNESS FOR PURPOSE. Microchip disclaims all liability
arising from this information and its use. Use of Microchip
devices in life support and/or safety applications is entirely at
the buyer’s risk, and the buyer agrees to defen d, indemnify and
hold harmless Microchip from any and all damages, claims,
suits, or expenses resulting from such use. No licenses are
conveyed, implicitly or otherwise, under any Microchip
intellectual property rights.
Trademarks
The Microchip name and logo, the Microchip logo, Accuron,
dsPIC, KEELOQ, KEELOQ logo, MPLAB, PIC, PICmicro,
PICST ART, PRO MA TE, rfPIC and SmartShunt are registered
trademarks of Microchip Technology Incorporated in the
U.S.A. and other countries.
FilterLab, Linear Active Thermistor, MXDEV, MXLAB,
SEEV AL, SmartSensor and The Embedded Control Solutions
Company are registered trademarks of Microchip Technology
Incorporated in the U.S.A.
Analog-for-the-Digital Age, Application Maestro, CodeGuard,
dsPICDEM, dsPICDEM.net, dsPICworks, dsSPEAK, ECAN,
ECONOMONITOR, FanSense, In-Circuit Serial
Programming, ICSP, ICEPIC, Mindi, MiWi, MPASM, MPLAB
Certified logo, MPLIB, MPLINK, mTouch, PICkit, PICDEM,
PICDEM.net, PICtail, PIC32 logo, PowerCal, PowerInfo,
PowerMate, PowerTool, REAL ICE, rfLAB, Select Mode, Total
Endurance, UNI/O, WiperLock and ZENA are trademarks of
Microchip Technology Incorporated in the U.S.A. and other
countries.
SQTP is a service mark of Microchip T echnology Incorporated
in the U.S.A.
All other trademarks mentioned herein are property of their
respective companies.
© 2008, Microchip Technology Incorporated, Printed in the
U.S.A., All Rights Reserved.
Printed on recycled paper.
Note the following details of the code protection feature on Microchip devices:
• Microchip products meet the specification contained in their particular Microchip Data Sheet.
• Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the
intended manner and under normal conditions.
• There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our
knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Dat a
Sheets. Most likely, the person doing so is engaged in theft of intellectual property.
• Microchip is willing to work with the customer who is concerned about the integrity of their code.
• Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not
mean that we are guaranteeing the product as “unbreakable.”
Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection featur es of our
products. Attempts to break Microchip’ s code protection feature may be a violation of the Digit al Millennium Copyright Act. If such acts
allow unauthorized access to you r software or other copyrighted work, you may have a right to sue for relief under that Act.
Microchip received ISO/TS-16949:200 2 certif ication for its worldwide
headquarters, design and wafer fabrication facilities in Chandler and
Tempe, Arizona; Gresham, Oregon and design centers in California
and India. The Company’s quality system processes and procedures
are for its PIC® MCUs and dsPIC® DSCs, KEELOQ® code hopping
devices, Serial EEPROMs, microperi pherals, nonvola tile memo ry and
analog product s. In addition, Microchip ’s quality system for the design
and manufacture of development systems is ISO 9001:2000 certified.
DS21394D-page 24 © 2008 Microchip Technology Inc.
AMERICAS
Corporate Office
2355 West Chandler Blvd.
Chandler, AZ 85224-6199
Tel: 480-792-7200
Fax: 480-792-7277
Technical Support:
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www.microchip.com
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China - Hong Kong SAR
Tel: 852-2401-1200
Fax: 852-2401-3431
China - Nanjing
Tel: 86-25-8473-2460
Fax: 86-25-8473-2470
China - Qingdao
Tel: 86-532-8502-7355
Fax: 86-532-8502-7205
China - Shanghai
Tel: 86-21-5407-5533
Fax: 86-21-5407-5066
China - Shenyang
Tel: 86-24-2334-2829
Fax: 86-24-2334-2393
China - Shenzhen
Tel: 86-755-8203-2660
Fax: 86-755-8203-1760
China - Wuhan
Tel: 86-27-5980-5300
Fax: 86-27-5980-5118
China - Xiamen
Tel: 86-592-2388138
Fax: 86-592-2388130
China - Xian
Tel: 86-29-8833-7252
Fax: 86-29-8833-7256
China - Zhuhai
Tel: 86-756-3210040
Fax: 86-756-3210049
ASIA/PACIFIC
India - Bangalore
Tel: 91-80-4182-8400
Fax: 91-80-4182-8422
India - New Delhi
Tel: 91-11-4160-8631
Fax: 91-11-4160-8632
India - Pune
Tel: 91-20-2566-1512
Fax: 91-20-2566-1513
Japan - Yokohama
Tel: 81-45-471- 6166
Fax: 81-45-471-6122
Korea - Daegu
Tel: 82-53-744-4301
Fax: 82-53-744-4302
Korea - Seoul
Tel: 82-2-554-7200
Fax: 82-2-558-5932 or
82-2-558-5934
Malaysia - Kuala Lumpur
Tel: 60-3-6201-9857
Fax: 60-3-6201-9859
Malaysia - Penang
Tel: 60-4-227-8870
Fax: 60-4-227-4068
Philippines - Manila
Tel: 63-2-634-9065
Fax: 63-2-634-9069
Singapore
Tel: 65-6334-8870
Fax: 65-6334-8850
Taiwan - Hsin Chu
Tel: 886-3-572-9526
Fax: 886-3-572-6459
Taiwan - Kaohsiung
Tel: 886-7-536-4818
Fax: 886-7-536-4803
Taiwan - Taipei
Tel: 886-2-2500-6610
Fax: 886-2-2508-0102
Thailand - Bangkok
Tel: 66-2-694-1351
Fax: 66-2-694-1350
EUROPE
Austria - Wels
Tel: 43-7242-2244-39
Fax: 43-7242-2244-393
Denmark - Copenhagen
Tel: 45-4450-2828
Fax: 45-4485-2829
France - Paris
Tel: 33-1-69-53-63-20
Fax: 33-1-69-30-90-79
Germany - Munich
Tel: 49-89-627-144-0
Fax: 49-89-627-144-44
Italy - Milan
Tel: 39-0331-742611
Fax: 39-0331-466781
Netherlands - Drunen
Tel: 31-416-690399
Fax: 31-416-690340
Spain - Madrid
Tel: 34-91-708-08-90
Fax: 34-91-708-08-91
UK - Wokingham
Tel: 44-118-921-5869
Fax: 44-118-921-5820
WORLDWIDE SALES AND SERVICE
01/02/08