Figure 1. ADS-945 Functional Block Diagram
REF
DAC
3-STATE OUTPUT REGISTER
53
52
51
50
49
48
47
46
45
44
43
42
41
40
TIMING AND
CONTROL LOGIC
ANALOG INPUT 4
START CONVERT 32
T/H STATUS 29
+1
BUFFER
DIGITAL CORRECTION LOGIC
FLASH
ADC
1
FLASH
ADC
2
3
AMP
GAIN
CIRCUIT
GAIN ADJUST 9
OFFSET
CIRCUIT
OFFSET ADJUST 18
14
+15V
SUPPLY
12
–15V
SUPPLY
55
+5V DIGITAL
SUPPLY
34 OUTPUT ENABLE
T/H
+10 REF. OUT 7
T/H STATUS 30
BIT 1 (MSB)
BIT 2
BIT 3
BIT 4
BIT 5
BIT 6
BIT 7
BIT 8
BIT 9
BIT 10
BIT 11
BIT 12
BIT 13
BIT 14 (LSB)
33 OVERFLOW
1,2,3,5,6,8,13,15,17,
19-25,62,64-68,70-76
ANALOG GROUND
27,28,31,35,37-39,54,58-60
DIGITAL
GROUND
36, 61
NO
CONNECT
57
–5.2V DIGITAL
SUPPLY
26 MISSING PIN
10,11,56 DO NOT CONNECT
CASE
DGND
AGND
BLOCK DIAGRAM
The low-cost ADS-945 is a high-performance,
14-bit, 10MHz sampling A/D converter. This
device accurately samples full-scale input signals
up to Nyquist frequencies with no missing codes.
The dynamic performance of the ADS-945
has been optimized to achieve a THD of –80dB
and a SNR of 75dB.
Packaged in a 2" x 4" module, the function-
ally complete ADS-945 contains a fast-settling
sample/hold amplifi er, a subranging (two-pass)
A/D converter, a precise voltage reference, timing/
control logic, three-state outputs, and error-
correction circuitry. Digital inputs and outputs are
TTL compatible (except for pins 29 and 30 which
are ECL).
Requiring ±15V, +5V and –5.2V supplies,
the ADS-945 typically dissipates 4.0W. The unit
is offered with a bipolar input range of ±1.25V.
Models are available for use in either commercial
(0 to +70°C) or military (–55 to +125°C) operat-
ing temperature ranges. Typical applications
include radar signal analysis, medical/graphic
imaging, and FFT spectrum analysis.
PRODUCT OVERVIEW
FEATURES
■ 14-bit resolution
■ 10MHz minimum throughput
■ Functionally complete
■ No missing codes
■ Low power, 4.0W
■ Excellent dynamic performance
■ Internally clamped input
■ Edge triggered
■ TTL compatible
■ 2" x 4" module
■ Very low profi le
INPUT/OUTPUT CONNECTIONS
PIN FUNCTION PIN FUNCTION
1 ANALOG GROUND 70-76 ANALOG GROUND
4 ANALOG INPUT 69 +5V ANALOG SUPPLY
5-6 ANALOG GROUND 64-68 ANALOG GROUND
7 +10V REFERENCE OUT 63 –5.2V ANALOG SUPPLY
8 ANALOG GROUND 62 ANALOG GROUND
9 GAIN ADJUST 61 NO CONNECT
10-11 DO NOT CONNECT 58-60 DIGITAL GROUND
12 –15V SUPPLY 57 –5.2V DIGITAL SUPPLY
13 ANALOG GROUND 56 DO NOT CONNECT
14 +15V SUPPLY 55 +5V DIGITAL SUPPLY
15-17 ANALOG GROUND 54 DIGITAL GROUND
18 OFFSET ADJUST 53 BIT 1 (MSB)
19-25 ANALOG GROUND 52 BIT 2
26 MISSING PIN 51 BIT 3
27 DIGITAL GROUND 50 BIT 4
28 DIGITAL GROUND 49 BIT 5
29 T/H STATUS 48 BIT 6
30 T/H STATUS 47 BIT 7
31 DIGITAL GROUND 46 BIT 8
32 START CONVERT 45 BIT 9
33 OVERFLOW 44 BIT 10
34 OUTPUT ENABLE (OE) 43 BIT 11
35 DIGITAL GROUND 42 BIT 12
36 NO CONNECT 41 BIT 13
37 DIGITAL GROUND 40 BIT 14 (LSB)
38 DIGITAL GROUND 39 DIGITAL GROUND
ADS-945
14-Bit, 10MHz Sampling A/D Converters
®®
DATEL • 11 Cabot Boulevard, Mansfi eld, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: help@datel.com
01 Apr 2011 MDA_ADS-945.B02 Page 1 of 8
PHYSICAL/ENVIRONMENTAL
PARAMETERS MIN. TYP. MAX. UNITS
Operating Temp. Range, Case
ADS-945 0 — +70 °C
ADS-945EX –55 — +125 °C
Thermal Impedance
Tjc — 10 — °C/Watt
Tca — 8 — °C/Watt
Storage Temperature Range –65 — +150 °C
Package Type 2" x 4" module
Weight 2.1 oz. (60 grams)
ABSOLUTE MAXIMUM RATINGS
PARAMETERS LIMITS UNITS
+15V Supply (Pins 14) 0 to +16 Volts
–15V Supply (Pin 12) 0 to –16 Volts
+5V Supply (Pins 55, 69) 0 to +6 Volts
–5V Supply (Pin 57, 63) 0 to –6 Volts
Digital Input (Pin 32, 34) –0.3 to +VDD +0.3 Volts
Analog Input (Pin 4) –15 to +15 Volts
Lead Temperature (10 seconds) +300 °C
+25°C 0 TO +70°C –55 TO +125°C
ANALOG INPUT MIN. TYP. MAX. MIN. TYP. MAX. MIN. TYP. MAX. UNITS
Input Voltage Range d— ±1.25 — — ±1.25 — — ±1.25 — Volts
Input Resistance 300 500 — 300 500 — 300 500 — k
Input Capacitance — 10 15 — 10 15 — 10 15 pF
Input Bias Current — ±3 — — ±3 — — ±3 — A
DIGITAL INPUT
Logic Levels
Logic "1" +2.0 — — +2.0 — — +2.0 — — Volts
Logic "0" — — +0.8 — — +0.8 — — +0.8 Volts
Logic Loading "1" — — +20 — — +20 — — +20 µA
Logic Loading "0" — — –20 — — –20 — — –20 µA
Start Convert Positive Pulse Width ➂ 10 50 — 10 50 — 10 50 — ns
STATIC PERFORMANCE
Resolution — 14 — — 14 — — 14 — Bits
Integral Nonlinearity (dc input) — ±0.5 — — ±0.75 — — ±1 — LSB
Differential Nonlinearity (fi n = 10kHz) –0.99 ±0.5 +1.5 –0.99 ±0.5 +1.5 –0.99 ±0.75 +2.5 LSB
Full Scale Absolute Accuracy — ±0.2 ±0.4 — ±0.3 ±0.5 — ±0.3 ±0.7 %FSR
Bipolar Offset Error (Tech Note 2) — ±0.15 ±0.25 — ±0.25 ±0.5 — ±0.3 ±0.7 %FSR
Gain Error (Tech Note 2) — ±0.1 ±0.2 — ±0.2 ±0.4 — ±0.3 ±0.7 %
No Missing Codes (fi n = 10kHz) 14 — — 14 — — 14 — — Bits
DYNAMIC PERFORMANCE
Peak Harmonics (–0.5dB)
dc to 1mHz — –80 –75 — — — — — — dB
1MHz to 2.5MHz — –80 –75 — — — — — — dB
2.5MHz to 5MHz — –79 –73 — –79 –73 — –75 –69 dB
Total Harmonic Distortion (–0.5dB)
dc to 1MHz — –80 –75 — — — — — — dB
1MHz to 2.5MHz — –80 –74 — — — — — — dB
2.5MHz to 5MHz — –78 –71 — –78 –71 — –75 –68 dB
Signal-to-Noise Ratio (w/o distortion, –0.5dB)
dc to 1MHz 71 75 — — — — — — — dB
100kHz to 2.5MHz 71 75 — — — — — — — dB
2.5MHz to 5MHz 70 74 — 69 74 — 67 72 — dB
Signal-to-Noise Ratio f (& distortion, –0.5dB)
dc to 100kHz 70 77 — — — — — — — dB
1MHz to 2.5MHz 70 74 — — — — — — — dB
2.5MHz to 5MHz 69 73 — 69 73 — 65 70 — dB
Noise — 110 — — 110 — — 110 — Vrms
Two-Tone Intermodulation Distortion
(fi n = 2.45MHz, 1.975MHz, fs = 10MHz, –0.5dB) — –84 — — –84 — — –84 — dB
Input Bandwidth (–3dB)
Small Signal (–20dB input) — 100 — — 100 — — 100 — MHz
Large Signal (–0.5dB input) — 50 — — 50 — — 50 — MHz
Feedthrough Rejection (fi n = 4.85MHz) — 90 — — 90 — — 90 — dB
Slew Rate — ±650 — — ±650 — — ±650 — V/s
Aperture Delay Time — ±8 — — ±8 — — ±8 — ns
Aperture Uncertainty — 2 — — 2 — — 2 — ps rms
S/H Acquisition Time ( to ±0.003%FSR, 2.5V step) — 40 — — 40 — — 40 — ns
Overvoltage Recovery Time ➄ — 30 100 — 30 100 — 30 100 ns
A/D Conversion Rate 10 — — 10 — — 10 — — MHz
FUNCTIONAL SPECIFICATIONS
(TA = +25°C, ±VCC = ±15V, +VDD = +5V,VDD = –5.2V, 10MHz sampling rate, and a minimum 10 minute warmup ➀ unless otherwise specifi ed.)
ADS-945
14-Bit, 10MHz Sampling A/D Converters
®®
DATEL • 11 Cabot Boulevard, Mansfi eld, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: help@datel.com
01 Apr 2011 MDA_ADS-945.B02 Page 2 of 8
TECHNICAL NOTES
Footnotes:
➀ All power supplies must be on before applying a start convert pulse. All supplies
and the clock (START CONVERT) must be present during warmup periods. The
device must be continuously converting during this time.
➁ The input to the ADS-945 is internally clamped at ±2.3V.
➂ An 50ns wide start convert pulse is used for all production testing. For applications
requiring less than a 10MHz sampling rate, a wider start convert can be used.
➃ Effective bits is equal to:
➄ This is the time required before the A/D output data is valid after the analog input
is back within the specifi ed range.
➅ Typical +5V and –5.2V current drain breakdowns are as follows:
+5V Analog = +195mA –5.2V Analog = –170mA
+5V Digital = + 95mA –5.2V Digital = –180mA
+5V Total = +290mA –5.2V Total = –350mA
(SNR + Distortion) – 1.76 + 20 log Full Scale Amplitude
Actual Input Amplitude
6.02
1. Obtaining fully specifi ed performance from the ADS-945 requires careful
attention to pc-card layout and power supply decoupling. The device's ana-
log and digital ground systems are connected to each other internally. For
optimal performance, tie all ground pins directly to a large analog ground
plane beneath the package.
Bypass all power supplies to ground with 10F tantalum capacitors in
parallel with 0.1F ceramic capacitors. The bypass capacitors should be
located as close to the unit as possible.
2. The ADS-945 achieves its specifi ed accuracies without the need for exter-
nal calibration. If required, the device's small initial offset and gain errors
can be reduced to zero using the adjustment circuitry shown in Figure 2.
The typical adjustment range is ±0.2%FSR for this circuitry.
When using this circuitry, or any similar offset and gain-calibration hard-
ware, make adjustments following warmup. To avoid interaction, always
adjust offset before gain.
3. To enable the three-state outputs, apply a logic "0" (low) to OUTPUT
ENABLE (pin 34). To disable, apply a logic "1" (high) to pin 34.
4. A passive bandpass fi lter is used at the input of the A/D for all production
testing.
5. The ADS-945's digital outputs should not be directly connected to a noisy
data bus. Drive the bus with 573 or 574 type latches and use "low-noise"
logic, such as the 74ALS series.
+25°C 0 TO +70°C –55 TO +125°C
ANALOG OUTPUT MIN. TYP. MAX. MIN. TYP. MAX. MIN. TYP. MAX. UNITS
Reference Output +9.95 +10 +10.05 +9.95 +10 +10.05 +9.95 +10 +10.05 Volts
Reference Temperature Drift — ±40 — — ±40 — — ±40 — ppm/°C
Reference Load Current — — 2.0 — — 2.0 — — 2.0 mA
DIGITAL OUTPUTS
Logic Levels
Logic "1" +2.7 — — +2.7 — — +2.7 — — Volts
Logic "0" — — +0.5 — — +0.5 — — +0.5 Volts
Logic Loading "1" — — –0.4 — — –0.4 — — –0.4 mA
Logic Loading "0" — — –8 — — –8 — — –8 mA
Delay, Rising Edge of Start Convert to Output Data Valid — — 35 — — 35 — — 35 ns
Delay, Edge of ENABLE to Output Data Valid/Invalid — — 18 — — 18 — — 18 ns
Output Coding Complementary Offset Binary
POWER REQUIREMENTS
Power Supply Ranges
+15V Supply +14.25 +15.0 +15.75 +14.25 +15.0 +15.75 +14.25 +15.0 +15.75 Volts
–15V Supply –14.25 –15.0 –15.75 –14.25 –15.0 –15.75 –14.25 –15.0 –15.75 Volts
+5V Supply +4.75 +5.0 +5.25 +4.75 +5.0 +5.25 +4.9 +5.0 +5.25 Volts
–5.2V Supply –4.95 –5.2 –5.45 –4.95 –5.2 –5.45 –5.1 –5.2 –5.45 Volts
Power Supply Currents ➅
+15V Supply — +35 +45 — +35 +45 — +35 +45 mA
–15V Supply — –10 –20 — –10 –20 — –10 –20 mA
+5V Supply — +290 +320 — +290 +320 — +290 +320 mA
–5.2V Supply — –350 –390 — –350 –390 — –350 –390 mA
Power Dissipation — 4.0 4.3 — 4.0 4.3 — 4.0 4.3 Watts
Power Supply Rejection — — ±0.04 — — ±0.04 — — ±0.04 %FSR/%V
ADS-945
14-Bit, 10MHz Sampling A/D Converters
®®
DATEL • 11 Cabot Boulevard, Mansfi eld, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: help@datel.com
01 Apr 2011 MDA_ADS-945.B02 Page 3 of 8
CALIBRATION PROCEDURE (Refer to Figure 2 and Table 1)
Note: Connect pin 18 to ANALOG GROUND (pin 19) for operation without
zero/offset adjustment. Connect pin 9 to ANALOG GROUND (pin 8) for
operation without gain adjustment.
Any offset and/or gain calibration procedures should not be implemented
until devices are fully warmed up. To avoid interaction, offset must be
adjusted before gain. The ranges of adjustment for the circuit in Figure 2
are guaranteed to compensate for the ADS-945's initial accuracy errors and
may not be able to compensate for additional system errors.
A/D converters are calibrated by positioning their digital outputs exactly
on the transition point between two adjacent digital output codes. This can
be accomplished by connecting LED's to the digital outputs and adjusting
until certain LED's "fl icker" equally between on and off. Other approaches
employ digital comparators or microcontrollers to detect when the outputs
change from one code to the next.
For the ADS-945, offset adjusting is normally accomplished at the point
where the MSB is a 1 and all other output bits are 0's and the LSB just
changes from a 0 to a 1. This digital output transition ideally occurs when
the applied analog input is +½ LSB (+76.3V).
Gain adjusting is accomplished when all bits are 0's and the LSB just
changes from a 0 to a 1. This transition ideally occurs when the analog
input is at +full scale minus 1 ½ LSB's (+1.249771V).
Note: Due to inherent system noise, the averaging of several conversions
may be needed to accurately adjust both offset and gain to 1LSB of
accuracy.
Zero/Offset Adjust Procedure
1. Apply a train of pulses to the START CONVERT input (pin 32) so the con-
verter is continuously converting.
2. Apply +76.3V to the ANALOG INPUT (pin 4).
3. Adjust the offset potentiometer until the output bits are 10 0000 0000 0000
and the LSB fl ickers between 0 and 1.
Gain Adjust Procedure
1. Apply +1.249771V to the ANALOG INPUT (pin 4).
2. Adjust the gain potentiometer until all output bits are 0's and the LSB fl ick-
ers between 0 and 1.
3. To confi rm proper operation of the device, vary the applied input voltage to
obtain the output coding listed in Table 1.
Note: A single +5V supply can be used for both the +5V ANALOG and the
+5V DIGITAL. If separate supplies are used, the difference between the two
can not exceed 100mV. This also applies to the –5.2V supply requirements.
Datel recommends using ferrite beads to separate the analog and digital sup-
plies (FAIR-RITE # 2643000301).
ADS-945
20k7
53
52
51
50
49
48
47
46
45
44
43
42
41
40
34
33
30
29
4
BIT 1 (MSB)
BIT 2
BIT 3
BIT 4
BIT 5
BIT 6
BIT 7
BIT 8
BIT 9
BIT 10
BIT 11
BIT 12
BIT 13
BIT 14 (LSB)
OUTPUT ENABLE
OVERFLOW
T/H STATUS
T/H STATUS
ANALOG INPUT
ANALOG
SUPPLY
DIGITAL
SUPPLY
55
54
58-60
OFFSET
ADJUST
18
0.1μF
10μF
64-68
63
0.1μF
10μF
69
++
–5.2V
+5V
32
START CONVERT
7
+10 REF. OUT
0.1μF
10μF 0.1μF
10μF
++
–5.2V
+5V
57
0.1μF
10μF
13
15-17
13
0.1μF
10μF
12
++
–15V
+15V
DIGITAL
SUPPLY
ANALOG
SUPPLY
0.1μF
9
GAIN
ADJUST 20k7
DIGITAL
GROUND
ANALOG
GROUND
ANALOG
GROUND
–15V
+15V +15V
–15V
Figure 2. ADS-945 Connection Diagram
Table 1. Output Coding
OUTPUT CODING INPUT RANGE
±1.25V
BIPOLAR
SCALE
MSB LSB
00 0000 0000 0000 +1.249847 +FS –1 LSB
00 0111 1111 1111 +0.937500 +3/4 FS
00 1111 1111 1111 +0.625000 +1/2FS
01 1111 1111 1111 0.000000 0
10 1111 1111 1111 –0.625000 –1/2FS
11 0111 1111 1111 –0.937500 –3/4FS
11 1111 1111 1110 –1.249847 –FS +1 LSB
11 1111 1111 1111 –1.250000 –FS
ADS-945
14-Bit, 10MHz Sampling A/D Converters
®®
DATEL • 11 Cabot Boulevard, Mansfi eld, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: help@datel.com
01 Apr 2011 MDA_ADS-945.B02 Page 4 of 8
Figure 3. ADS-945 Evaluation Board Schematic (DATEL Dwg. #A-23442)
LATCHES
DATA
0.1" GRID
HOLE PATTERN
-5.2VA-5.2V -15V
+15V+5VA+5V
-5.2V
+5V
+5V
-V
+V
+15V
-15V
-5.2VA
+5VA
+5VD
(LSB) BIT 14
BIT 13
BIT 12
BIT 11
BIT 10
BIT 9
BIT 8
BIT 7
BIT 6
BIT 5
BIT 4
BIT 1
BIT 3
BIT 2
(MSB)
-5.2VD
-5.2VA
+5VA
OS3
ENABLE
CLOCK
T/H
T/H
OFFSET
+15V
-15V
GAIN
VREF
IN
+
+5V
CP OC
GND
+5V
Q8
Q7
Q6
Q5
Q4
Q3
Q2
Q1
3D
8D
7D
6D
5D
4D
2D
1D
CP OC
GND
+5V
Q8
Q7
Q6
Q5
Q4
Q3
Q2
Q1
3D
8D
7D
6D
5D
4D
2D
1D
++
-15V
-15V
+15V
+15V
+
+
-15V/80MA
+15V/50MA
+15V
-15V
-5.2V
+5VD
+5VA
-5.2VD
-5.2VA
+5VA
+5VD
-5.2VD
-5.2VA
+5VA/350MA
O.F.
DNC
U4
C26
C23
C22
C17
C16
C15
C14
C9
C21
C20
C19
C18
U1
C29
C28
C27
U7
U6
C2
C1
D1
L2
L1
JPR1
JPR2
P2
P1
X1
R2
R1
P4
R12
51.1
R3
L11
L10
L3
L4
L5
L6
NC
R5
L7
D2
D3 C3
D4 C4
JPR3
SG3
SG1
SG2 SG4
P3
D
D
D
D
D
D
EXT
INT
INT
EXT
CONNECTOR
CONNECTOR
8
1,7
14
CW
OFFSET
CW
GAIN
EXT. CLOCK
MSB BIT 1
BIT 9
BIT 10
BIT 11
BIT 12
BIT 13
LSB BIT 14
OVERFLOW
CLOCK
EOC
BIT 8
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
ENABLE
AGND
AGND
DGND
DGND
LT1016
10PF
ADS945
ALS573
ALS573
OUTPUT ENABLE
CLOCK
DATA OUTPUT
POWER SUPPLY
10MHZ
20K
20K
10K
51.1
(OPT)
8
7
6
5
4
3
2
1
76
75
74
73
72
71
70
69
68
67
66
65
64
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
3938
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
20
129
813
14
7
615
11
10
165
417
183
219
1
20
129
813
147
615
11
10
165
417
183
219
1
3
2
1
3
2
1
2
34 33
32 31
30 29
28 27
26 25
24 23
22 21
20 19
18 17
16 15
14 13
12 11
10 9
87
65
43
21
26 25
24 23
22 21
20 19
18 17
16 15
14 13
12 11
10 9
87
65
43
21
3
2
1
3
2
1
1
3
ADS-945
14-Bit, 10MHz Sampling A/D Converters
®®
DATEL • 11 Cabot Boulevard, Mansfi eld, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: help@datel.com
01 Apr 2011 MDA_ADS-945.B02 Page 5 of 8
Figure 4. ADS-945 Timing Diagram
DATA N-1 VALID DATA N VALID
INVALID
DATA
90ns typ.
Note: Scale is approximately 10ns per division.
DATA N+1 VALID
START
CONVERT
OUTPUT
DATA
T/H
T/H
NN+1
Acquisition Time
10ns typ.
35ns max.
50ns typ.
60ns typ.
Hold
N+2
40ns typ.
Hold
Hold
10ns typ.
Figure 5. ADS-945 FFT Analysis Figure 6. ADS-945 Grounded Input Histogram
This histogram represents the typical peak-to-peak
noise (including quantization noise) associated with
the ADS-945. 16,384 conversions were processed with
the input to the ADS-945 tied to analog ground.
9000
8000
7000
6000
5000
4000
3000
2000
1000
0
Digital Output Code
TIMING NOTES
1. The ADS-945 is an edge-triggered device requiring no additional external
timing signals. The rising edge of the start convert pulse initiates a con-
version.
2. A start convert pulse of 50ns is recommended when sampling at 10MHz.
3. The falling edge of the subsequent start convert pulse (N+1) or the rising
edge of the N+2 pulse can be used to latch data from conversion N (1
pipeline delay).
ADS-945
14-Bit, 10MHz Sampling A/D Converters
®®
DATEL • 11 Cabot Boulevard, Mansfi eld, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: help@datel.com
01 Apr 2011 MDA_ADS-945.B02 Page 6 of 8
Figure 8. ADS-945 Dynamic Performance vs. Input Frequency at +25°C
SNR+D vs. Input FrequencySNR vs. Input Frequency
THD vs. Input Frequency
1 10 100 1000 10000 100000
Frequency (kHz)
Peak Harmonic (–dB)
90
80
70
60
50
40
30
20
10
0
SNR (dB)
SNR+D (dB)
THD (–dB)
PH vs. Input Frequency
1 10 100 1000 10000 100000
Frequency (kHz)
90
80
70
60
50
40
30
20
10
0
1 10 100 1000 10000 100000
Frequency (kHz)
Peak Harmonic (–dB)
90
80
70
60
50
40
30
20
10
0
THD (–dB)
1 10 100 1000 10000 100000
Frequency (kHz)
90
80
70
60
50
40
30
20
10
0
Figure 7. ADS-945 Histogram and Differential Nonlinearity
ADS-945
14-Bit, 10MHz Sampling A/D Converters
®®
DATEL • 11 Cabot Boulevard, Mansfi eld, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: help@datel.com
01 Apr 2011 MDA_ADS-945.B02 Page 7 of 8
MECHANICAL DIMENSIONS INCHES (mm)
0.15 MIN.
(3.81) 2.06 MAX.
(52.32)
4.06
(103.12)
MAX.
4.02
(102.11)
MAX.
0.29 MAX.
(7.37)
0.06 (1.52)
0.25 Square
(6.35) TYP.
Epoxy glass
(
FR-4
)
base
Metal case
0.100 (2.54) TYP.
3.700
(93.98)
1.80
(45.72)
Missing pin 26
is for keying
purposes
Insulated surface with
internal ground plane
1
3839
76
2.02 MAX.
(51.31)
ORDERING INFORMATION
MODEL
NUMBER
OPERATING
TEMP. RANGE ACCESSORIES
ADS-945 0 to +70°C
ADS-945 Evaluation Board (without ADS-945)
ADS-945EX –55 to +125°C
ADS-945
14-Bit, 10MHz Sampling A/D Converters
. makes no representation that the use of its products in the circuits described herein, or the use of other
technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not
imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifi cations are subject to change
without notice.
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01 Apr 2011 MDA_ADS-945.B02 Page 8 of 8