General Description
The MAX5430/MAX5431 are digitally programmable
high-precision resistor arrays for PGAs. The MAX5430/
MAX5431 operate from a single 15V supply or dual
±15V supplies, and consume only 35µA supply current.
These devices are intended for programmable-gain
amplifier (PGA) applications and consist of fixed resis-
tor-dividers. Each device has digitally controlled con-
tacts with four precision noninverting gains of 1, 2, 4,
and 8 with ratio accuracy of 0.025% (MAX5430A/
MAX5431A), 0.09% (MAX5430B/MAX5431B), or 0.5%
(MAX5430C/MAX5431C). The MAX5431 includes an
on-chip matching resistor for op amp input bias-current
compensation.
The MAX5430/MAX5431 are available in space-saving
8-pin SOT23 and 10-pin µMAX®packages, and speci-
fied over the extended temperature range of (-40°C to
+85°C).
Applications
General-Purpose Programmable Noninverting
Amplifier
Programmable Instrumentation Amplifier
Features
♦Four Noninverting PGA Gain Configurations:
AV= 1, 2, 4, and 8
♦Precision 0.025% Ratio Accuracy
♦On-Chip Matching Resistor for Op Amp Bias-
Current Compensation (MAX5431)
♦Single-Supply +12V to +15V, or Dual-Supply ±12V
to ±15V Operation
♦Low 35µA Supply Current
♦CMOS/TTL Logic Compatible 2-Wire Parallel
Interface
♦Space-Saving 8-Pin SOT23 and 10-Pin µMAX
Packages
♦+3V Logic Compatibility
MAX5430/MAX5431
±15V Digitally Programmable
Precision Voltage-Dividers for PGAs
________________________________________________________________ Maxim Integrated Products 1
1
2
3
4
5
10
9
8
7
6
GND
MATCH_L
MATCH_H
VDD
MAX5431
µMAX
TOP VIEW
H
W
D0
D1
VSS
L
Pin Configurations
Ordering Information
DECODER
MATCH_H
MATCH_L
MAX5431 ONLY
H
VDD
W
L
GND
VSS
MAX5430
MAX5431
D0
D1
Functional Diagram
19-2222; Rev 2; 7/05
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
PART TEMP
RANGE
PIN-
PACKAGE
GAIN
ACCURACY
MAX5430AEKA
-40°C to +85°C
8 SOT23 0.025%
MAX5430BEKA
-40°C to +85°C
8 SOT23 0.09%
MAX5430CEKA
-40°C to +85°C
8 SOT23 0.5%
MAX5431AEUB
-40°C to +85°C 10 µMAX
0.025%
MAX5431BEUB
-40°C to +85°C 10 µMAX
0.09%
MAX5431CEUB
-40°C to +85°C 10 µMAX
0.5%
Pin Configurations continued at end of data sheet.
µMax is a registered trademark of Maxim Integrated Products, Inc.
MAX5430/MAX5431
±15V Digitally Programmable
Precision Voltage-Dividers for PGAs
2_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VDD = +15V, VSS = -15V, GND = 0, TA= TMIN to TMAX. Typical values are at TA= +25°C, unless otherwise noted.) (Note 1)
Stresses beyond those 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 beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Note 1: All devices are 100% production tested at TA= +25°C. SOT23 packages are guaranteed by design from TA= TMIN to TMAX.
Note 2: Gain accuracy is measured without load at pin W.
VDD to GND............................................................-0.3V to +17V
VSS to GND.............................................................-17V to +0.3V
D0, D1 to GND .........................................................-0.3V to +6V
H, L, W, MATCH_ to GND ................(VSS - 0.3V) to (VDD + 0.3V)
Current Into Any Signal Pin...............................................±50mA
Continuous Power Dissipation (TA= +70°C)
8-Pin SOT23 (derate 8.9mW/°C above +70°C)............714mW
10-Pin µMAX (derate 10.3mW/°C above +70°C) .........825mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-60°C to +150°C
Junction Temperature......................................................+150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
DC PERFORMANCE
MAX543_A
0.025
MAX543_B
0.09
Divider Ratio Accuracy
(Note 2) VH = +5V, VL = -5V
MAX543_C 0.5
%
Resistance between H and L
(Figure 1) RHL 57 kΩ
Capacitance at Analog Pins
CANALOG
2pF
Ratio = 1 0.5
Matching Resistor Ratio = 2, 4, 8 14 kΩ
Ratio = 1 0.5
Wiper Resistance RWRatio = 2, 4, 8 14 kΩ
W, H, L, MATCH_H, MATCH _L
Voltage Range
VANALOG
VSS
VDD
V
DIGITAL INPUTS
Input High Voltage VIH 2.4 V
Input Low Voltage VIL 0.8 V
Input Leakage Current D0, D1 = 5V or GND ±1 µA
Input Capacitance CIN 5pF
POWER REQUIREMENTS
Negative Supply Current ISS 125µA
Positive Supply Current IDD 35 60 µA
Positive Power-Supply Voltage VDD
10.8 15.75
V
Negative Power-Supply Voltage
VSS
-15.75
0V
DYNAMIC PERFORMANCE
Switching Time
tD2W
,
tH2W
0.3 µs
MAX5430/MAX5431
±15V Digitally Programmable
Precision Voltage-Dividers for PGAs
_______________________________________________________________________________________ 3
-0.0020
-0.0015
-0.0005
-0.0010
0
0.0005
0.0015
0.0020
0.0010
-40 -10 5 20
TEMPERATURE (°C)
-25 35 506580
MAX543_A DIVIDER RATIO ACCURACY
vs. TEMPERATURE (RATIO = 1)
MAX5430 toc01
DIVIDER RATIO ACCURACY (%)
-0.010
-0.006
-0.008
-0.002
-0.004
0.002
0
0.004
0.008
0.010
0.006
-40 -10 5 20
TEMPERATURE (°C)
-25 35 50 65 80
MAX543_A DIVIDER RATIO ACCURACY
vs. TEMPERATURE (RATIO = 2)
MAX5430 toc02
DIVIDER RATIO ACCURACY (%)
-0.010
-0.006
-0.008
-0.002
-0.004
0.002
0
0.004
0.008
0.006
0.010
-40 -10 5 20
TEMPERATURE (°C)
-25 35 50 65 80
MAX543_A DIVIDER RATIO ACCURACY
vs. TEMPERATURE (RATIO = 4)
MAX5430 toc03
DIVIDER RATIO ACCURACY (%)
-0.010
-0.006
-0.008
-0.002
-0.004
0.002
0
0.004
0.008
0.006
0.010
-40 -10 5 20
TEMPERATURE (°C)
-25 35 506580
MAX543_A DIVIDER RATIO ACCURACY
vs. TEMPERATURE (RATIO = 8)
MAX5430 toc04
DIVIDER RATIO ACCURACY (%)
-0.0020
-0.0015
-0.0005
-0.0010
0.0005
0
0.0010
0.0015
0.0020
-40 -10 5 20
TEMPERATURE (°C)
-25 35 50 65 80
MAX543_B DIVIDER RATIO ACCURACY
vs. TEMPERATURE (RATIO = 1)
MAX5430 toc05
DIVIDER RATIO ACCURACY (%)
-0.020
-0.015
-0.005
-0.010
0
0.005
0.015
0.010
0.020
-40 -10 5 20
TEMPERATURE (°C)
-25 35 506580
MAX543_B DIVIDER RATIO ACCURACY
vs. TEMPERATURE (RATIO = 2)
MAX5430 toc06
DIVIDER RATIO ACCURACY (%)
-0.010
-0.006
-0.008
-0.004
0
-0.002
0.010
0.008
0.006
0.004
0.002
-40 -10 5 20-25 35 506580
MAX543_B DIVIDER RATIO ACCURACY
vs.TEMPERATURE (RATIO = 4)
MAX5430 toc07
DIVIDER RATIO ACCURACY (%)
TEMPERATURE (°C)
-0.010
-0.006
-0.008
-0.002
-0.004
0.002
0
0.004
0.008
0.006
0.010
-40 -10 5 20
TEMPERATURE (°C)
-25 35 506580
MAX543_B DIVIDER RATIO ACCURACY
vs. TEMPERATURE (RATIO = 8)
MAX5430 toc08
DIVIDER RATIO ACCURACY (%)
-0.010
-0.006
-0.008
-0.004
0
0.004
0.006
0.008
0.010
11 12 13 14 15
MAX543_A DIVIDER RATIO ACCURACY
vs. POSITIVE SUPPLY (VSS = -15V)
MAX5430 toc09
POSITIVE SUPPLY (V)
DIVIDER RATIO ACCURACY (%)
RATIO 1
-0.002
0.002
RATIO 2
RATIO 8
RATIO 4
Typical Operating Characteristics
(VDD = +15V, VSS = -15V or VSS = GND, VH= 5V, VL=-5V, TA= 25°C, unless otherwise noted.) (Note 3)
MAX5430/MAX5431
±15V Digitally Programmable
Precision Voltage-Dividers for PGAs
4_______________________________________________________________________________________
Typical Operating Characteristics (continued)
(VDD = +15V, VSS = -15V or VSS = GND, VH= 5V, VL=-5V, TA= 25°C, unless otherwise noted.) (Note 3)
-0.010
-0.004
-0.006
-0.008
-0.002
0
0.002
0.004
0.006
0.008
0.010
11 12 13 14 15
MAX543_B DIVIDER RATIO ACCURACY
vs. POSITIVE SUPPLY (VSS = -15V)
MAX5430 toc10
POSITIVE SUPPLY (V)
DIVIDER RATIO ACCURACY (%)
RATIO 2 RATIO 4
RATIO 1
RATIO 8
11 12 13 14 15
MAX543_A DIVIDER RATIO ACCURACY
vs. POSITIVE SUPPLY (VSS = 0V)
MAX5430 toc11
POSITIVE SUPPLY (V)
DIVIDER RATIO ACCURACY (%)
RATIO 2
RATIO 4
RATIO 1
RATIO 8
-0.010
-0.004
-0.006
-0.008
-0.002
0
0.002
0.004
0.006
0.008
0.010 VL = 0
-0.010
-0.004
-0.006
-0.008
-0.002
0
0.002
0.004
0.006
0.008
0.010
11 12 13 14 15
MAX543_B DIVIDER RATIO ACCURACY
vs. POSITIVE SUPPLY (VSS = 0V)
MAX5430 toc12
POSITIVE SUPPLY (V)
DIVIDER RATIO ACCURACY (%)
RATIO 2
RATIO 4
RATIO 1 RATIO 8
VL = 0
-15 -12 -6-9 -3 0
MAX543_A DIVIDER RATIO ACCURACY
vs. NEGATIVE SUPPLY
MAX5430 toc13
NEGATIVE SUPPLY (V)
DIVIDER RATIO ACCURACY (%)
-0.010
-0.004
-0.006
-0.008
-0.002
0
0.002
0.004
0.006
0.008
0.010
RATIO 2
RATIO 1
RATIO 8
RATIO 4
VL = 0
0
10
5
20
15
25
30
-40 -10 5 20-25 35 50 65 80
SUPPLY CURRENT
vs. TEMPERATURE
MAX5430 toc15
TEMPERATURE (°C)
SUPPLY CURRENT (µA)
D0, D1 = 0V
D0, D1 = 5V
Note 3: For MAX543_C accuracy Typical Operating Characteristics, refer to MAX543_B accuracy Typical Operating Characteristics.
-15 -12 -6-9 -3 0
MAX543_B DIVIDER RATIO ACCURACY
vs. NEGATIVE SUPPLY
MAX5430 toc14
NEGATIVE SUPPLY (V)
DIVIDER RATIO ACCURACY (%)
-0.010
-0.004
-0.006
-0.008
-0.002
0
0.002
0.004
0.006
0.008
0.010
RATIO 2
RATIO 1 RATIO 8
RATIO 4
MAX5430/MAX5431
±15V Digitally Programmable
Precision Voltage-Dividers for PGAs
_______________________________________________________________________________________ 5
Pin Description
PIN
MAX5431 MAX5430
NAME FUNCTION
18V
DD Positive Power Supply
2—
MATCH_H
Matching Resistor High Terminal
37GND Ground
46HHigh Terminal of Resistive-Divider
55LLow Terminal of Resistive-Divider
6—
MATCH_L
Matching Resistor Low Terminal
74V
SS Negative Power Supply
83WWiper Terminal of Resistive-Divider
92D1 Second Bit Digital Input (MSB) (Table 1)
10 1 D0 First Bit Digital Input (LSB) (Table 1)
Detailed Description
The MAX5430/MAX5431 are digitally programmable pre-
cision resistor arrays. These devices have fixed resistor-
dividers with digitally controlled contacts, providing four
precision noninverting gains of 1, 2, 4, and 8 for PGA
applications (see Functional Diagram and Figure 1). The
MAX5430/MAX5431 achieve ratio accuracies of 0.025%
(MAX5430A/MAX5431A), 0.09% (MAX5430B/MAX5431B),
or 0.5% (MAX5430C/MAX5431C).
The end-to-end resistance from H to L is 57kΩ. The
impedance seen at W is designed to be the same 14kΩ
for gain settings 2, 4, and 8, ensuring excellent op amp
input-resistance balance, regardless of gain setting. In
a gain of 1 configuration, H is internally connected to W
with a typical resistance of 500Ω.
Matching Resistor (MAX5431)
The MAX5431 includes a matching resistor to compen-
sate the offset voltage due to the input bias current of
the op amp. The resistance from MATCH_H to
MATCH_L is a fixed matching resistor, equal to the
resistance seen at W for gains of 2, 4, and 8. In the
gain of 1, an internal switch short circuits MATCH_H
and MATCH_L. This internal switch matches the imped-
ance of the switch between H and W.
Figure 1. Simplified Functional Diagram
4R
2R
RATIO = 2
RATIO = 1
R
L
W
H
RATIO = 4
RATIO = 8
R
DIGITAL INPUTS
D1 D0 GAIN
00 1
01 2
10 4
11 8
Table 1. Logic-Control Truth Table
Digital Interface Operation
The MAX5430/MAX5431 feature a simple two-bit paral-
lel programming interface. D1 and D0 program the gain
setting according to the Logic-Control Truth Table (see
Table 1). The digital interface is CMOS/TTL logic com-
patible.
Applications Information
Programmable-Gain Amplifier
The MAX5430/MAX5431 are ideally suited for high-pre-
cision PGA applications. The typical application circuit
of Figure 2 uses the MAX5431 with matching resistor to
compensate for voltage offset due to op amp input bias
currents. Use the MAX5430 with an ultra-low input bias
current op amp (see Figure 3).
Power Supplies and Bypassing
The MAX5430/MAX5431 operate from dual ±15V sup-
plies or a single 15V supply. For dual supplies, bypass
VDD and VSS with 0.1µF ceramic capacitors to GND.
For single supply, connect VSS to GND and bypass
VDD with a 0.1µF ceramic capacitor to GND.
Switching Time and Layout Concerns
The switching time of the MAX5430/MAX5431 depends
on the capacitive loading at W. For best performance,
reduce parasitic board capacitance by minimizing the
circuit board trace from W to the op amp inverting input,
and choose an op amp with low input capacitance.
MAX5430/MAX5431
±15V Digitally Programmable
Precision Voltage-Dividers for PGAs
6_______________________________________________________________________________________
15V
MATCH_L
W
H
15V
MATCH_H
VSS
VDD
GNDL
MAX5431
VIN
VOUT
15V
W
H
15V
VSS
VDD
GNDL
MAX5430
VIN
VOUT
Figure 2. MAX5431 Typical Application Circuit PGA with Input
IBIAS Matching
Figure 3. Programmable-Gain Amplifier Using the MAX5430
1
2
8
7
SOT23
TOP VIEW
3
4
6
5
MAX5430
VDD
D0
VSS L
H
W
D1 GND
Pin Configurations (continued)
Chip Information
TRANSISTOR COUNT: 121
PROCESS: CMOS
MAX5430/MAX5431
±15V Digitally Programmable
Precision Voltage-Dividers for PGAs
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 7
©2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.
SOT23, 8L .EPS
REV.DOCUMENT CONTROL NO.APPROVAL
PROPRIETARY INFORMATION
TITLE:
3.002.60E
C
E1
E
BETWEEN 0.08mm AND 0.15mm FROM LEAD TIP.
8. MEETS JEDEC MO178.
8∞
0.60
1.75
0.30
L2
0∞
e1
e
L
1.50E1
0.65 BSC.
1.95 REF.
0.25 BSC.
GAUGE PLANE
SEATING PLANE C
C
L
PIN 1
I.D. DOT
(SEE NOTE 6)
L
C
L
C
A2
e1
D
DETAIL "A"
5. COPLANARITY 4 MILS. MAX.
NOTE:
7. SOLDER THICKNESS MEASURED AT FLAT SECTION OF LEAD
6. PIN 1 I.D. DOT IS 0.3 MM ÿ MIN. LOCATED ABOVE PIN 1.
4. PACKAGE OUTLINE INCLUSIVE OF SOLDER PLATING.
3. PACKAGE OUTLINE EXCLUSIVE OF MOLD FLASH & METAL BURR.
HEEL OF THE LEAD PARALLEL TO SEATING PLANE C.
2. FOOT LENGTH MEASURED FROM LEAD TIP TO UPPER RADIUS OF
1. ALL DIMENSIONS ARE IN MILLIMETERS.
L2
L
A1
A
0.45
1.30
0.15
1.45
MAX
0.28b
0.90A2
0.00A1
0.90
A
MIN
SYMBOL
3.00
0.20
2.80D
0.09
C
SEE DETAIL "A"
L
C
be
D
1
21-0078 1
PACKAGE OUTLINE, SOT-23, 8L BODY
0
0
10LUMAX.EPS
PACKAGE OUTLINE, 10L uMAX/uSOP
1
1
21-0061 I
REV.DOCUMENT CONTROL NO.APPROVAL
PROPRIETARY INFORMATION
TITLE:
TOP VIEW
FRONT VIEW
1
0.498 REF
0.0196 REF
S
6°
SIDE VIEW
α
BOTTOM VIEW
0° 0° 6°
0.037 REF
0.0078
MAX
0.006
0.043
0.118
0.120
0.199
0.0275
0.118
0.0106
0.120
0.0197 BSC
INCHES
1
10
L1
0.0035
0.007
e
c
b
0.187
0.0157
0.114
H
L
E2
DIM
0.116
0.114
0.116
0.002
D2
E1
A1
D1
MIN
-A
0.940 REF
0.500 BSC
0.090
0.177
4.75
2.89
0.40
0.200
0.270
5.05
0.70
3.00
MILLIMETERS
0.05
2.89
2.95
2.95
-
MIN
3.00
3.05
0.15
3.05
MAX
1.10
10
0.6±0.1
0.6±0.1
Ø0.50±0.1
H
4X S
e
D2
D1
b
A2 A
E2
E1 L
L1
c
α
GAGE PLANE
A2 0.030 0.037 0.75 0.95
A1
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
