GENERAL DESCRIPTION
The low-cost ADS-937 is a 16-bit, 1MHz sampling A/D
converter. This device accurately samples full-scale input
signals up to Nyquist frequencies with no missing codes.
This feature, combined with excellent signal-to-noise ratio
(SNR) and total harmonic distortion (THD), makes the ADS-
937 the ideal choice for both time-domain (CCD/medical
imaging, scanners, process control) and frequency-domain
(radar, telecommunications, spectrum analysis) applications.
Packaged in a 32-pin, side-brazed, metal-sealed, ceramic
TDIP, the functionally complete ADS-937 contains a
fastsettling sample-hold amplifi er, a subranging (two-pass)
A/D converter, an internal reference, timing/control logic,
and error correction circuitry. Digital input and output levels
are TTL. The ADS-937 only requires the rising edge of the
start convert pulse to operate.
Requiring ±15V and ±5V supplies, the ADS-937 typically
dissipates 1.25 Watts. The device is offered with both
bipolar (±5V) and unipolar (0 to –10V) analog input ranges.
Models are available for use in either commercial (0 to
+70°C) or military (–55 to +125°C) operating temperature
ranges. A proprietary, auto-calibrating, error-correcting
circuit enables the device to achieve specifi ed performance
over the full military temperature range.
Figure 1. ADS-937 Functional Block Diagram
INPUT/OUTPUT CONNECTIONS
PIN FUNCTION PIN FUNCTION
1 ANALOG INPUT 32 BIT 1 (MSB)
2 GROUND 31 BIT 2
3 UNIPOLAR 30 BIT 3
4 OFFSET ADJUST 29 BIT 4
5 +5V REFERENCE OUT 28 BIT 5
6 GAIN ADJUST 27 BIT 6
7 COMPENSATION 26 BIT 7
8 -15V SUPPLY 25 BIT 8
9 +15V SUPPLY 24 BIT 9
10 +5V SUPPLY 23 BIT 10
11 -5V SUPPLY 22 BIT 11
12 GROUND 21 BIT 12
13 GROUND 20 BIT 13
14 +5V SUPPLY 19 BIT 14
15 EOC 18 BIT 15
16 START CONVERT 17 BIT 16 (LSB)
FEATURES
■ 16-bit resolution
■ 1MHz sampling rate
■ No missing codes over full HI-REL temperature
range
■ Very low power, 1.25 Watts
■ Small, 32-pin, side-brazed ceramic TDIP
■ Edge-triggered
■ Excellent performance
■ Ideal for both time and frequency-domain
applications
■ Low cost
R
EF D
A
C
A
32
BI
T
1
(
MSB
)
31
BI
T
2
30
BI
T
3
2
9
T
IB4
2
8
BI
T
5
2
7
BI
T
6
2
6
B
IT
7
2
5
BI
T
8
24
BI
T
9
2
3
B
I
T
1
0
2
2
B
I
T
1
1
2
1
BI
T
1
2
2
0
B
I
T
1
3
1
9
BI
T
1
4
1
8
BI
T
1
5
1
7
BI
T
1
6
(
LSB
)
TIMI
N
G
A
N
D
C
O
N
T
R
O
L
L
OG
I
C
ANAL
OG
INP
UT
1
S
TAR
T
CO
NVER
T
1
6
E
OC
1
5
–
+
S/
H
B
U
FF
E
R
D
I
GI
T
A
L
C
O
RR
E
C
T
I
O
N
L
OGI
C
FLA
S
H
A
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C
1
FLA
S
H
A
D
C
2
6
AMP
G
AI
N
C
IR
CU
I
T
C
O
M
PEN
S
ATI
O
N
7
+5V
R
EFEREN
CE
OUT
5
1
0
+5
V
A
N
A
L
O
G
SU
PP
L
Y
1
1
–5
V
A
N
A
L
O
G
SU
PP
L
Y
2,
1
2
A
N
A
L
O
G
G
R
OUN
D
1
4
+5
V
DI
G
ITA
L
SU
PP
L
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9
+
1
5
V
SU
PP
L
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8
–
1
5
V
SU
PP
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Y
1
3
DI
G
ITA
L
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OUN
D
O
FF
S
E
T
A
D
JUST
4
U
NIP
O
LA
R
3
G
AIN
A
D
JUST
6
BLOCK DIAGRAM
22 Jun 2012 MDA_ADS-937.A04 Page 1 of 8
ADS-937
16-Bit, 1MHz 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
+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 ➁
Bipolar — ±5 — — ±5 — — ±5 — Volts
Unipolar — 0 to -10 — — 0 to -10 — — 0 to -10 — Volts
Input Resistance — 1 — — 1 — — 1 — k
Input Capacitance — 7 15 — 7 15 — 7 15 pF
DIGITAL INPUTS
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 20 500 — 20 500 — 20 500 — ns
STATIC PERFORMANCE
Resolution — 16 — — 16 — — 16 — Bits
Integral Nonlinearity — ±0.75 — — ±1.5 — — ±2 — LSB
Differential Nonlinearity (fin = 10kHz) –0.95 ±0.5 +1 –0.95 ±0.5 +1 –0.95 ±0.5 +1.5 LSB
Full Scale Absolute Accuracy — ±0.1 ±0.25 — ±0.2 ±0.4 — ±0.25 ±0.5 %FSR
Bipolar Zero Error (Tech Note 2) — ±0.1 ±0.15 — ±0.1 ±0.25 — ±0.15 ±0.5 %FSR
Bipolar Offset Error (Tech Note 2) — ±0.1 ±0.2 — ±0.15 ±0.3 — ±0.2 ±0.5 %FSR
Gain Error (Tech Note 2) — ±0.1 ±0.3 — ±0.25 ±0.5 — ±0.4 ±0.7 %
Unipolar Offset Error (Tech Note 2) — ±0.1 ±0.15 — ±0.1 ±0.25 — ±0.15 ±0.5 %FSR
No Missing Codes (fin = 10kHz) 16 — — 16 — — 16 — — Bits
DYNAMIC PERFORMANCE
Peak Harmonics (–0.5dB)
dc to 100kHz — –90 -84 — –90 -84 — –88 -83 dB
100kHz to 500kHz — –88 -81 — –88 -81 — –87 -80 dB
Total Harmonic Distortion (–0.5dB)
dc to 100kHz — –87 -82 — –87 -82 — –86 -81 dB
100kHz to 500kHz — –86 -81 — –86 -81 — –85 -80 dB
Signal-to-Noise Ratio
(w/o distortion, –0.5dB)
dc to 100kHz 85 88 — 85 88 — 84 87 — dB
100kHz to 500kHz 84 87 — 84 87 — 83 87 — dB
Signal-to-Noise Ratio ➃
(& distortion, –0.5dB)
dc to 100kHz 81 85 — 81 85 — 80 84 — dB
100kHz to 500kHz 80 84 — 80 84 — 78 83 — dB
Noise — 110 — — 110 — — 110 — µVrms
Two-Tone Intermodulation
Distortion (fin = 100kHz,
240kHz, fs = 1MHz, –0.5dB) — –85 — — –85 — — –85 — dB
Input Bandwidth (–3dB)
Small Signal (–20dB input) — 4.5 — — 4.5 — — 4.5 — MHz
Large Signal (–0.5dB input) — 4 — — 4 — — 4 — MHz
Feedthrough Rejection (fin = 500kHz) — 84 — — 84 — — 84 — dB
Slew Rate — ±33 — — ±33 — — ±33 — V/µs
Aperture Delay Time — +20 — — +20 — — +20 — ns
Aperture Uncertainty — 5 — — 5 — — 5 — ps rms
S/H Acquisition Time
( to ±0.003%FSR, 10V step) — 260 300 — 260 300 — 260 300 ns
Overvoltage Recovery Time ➄ — 500 1000 — 500 1000 — 500 1000 ns
A/D Conversion Rate 1 — — 1 — — 1 — — MHz
PARAMETERS MIN. TYP. MAX. UNITS
Operating Temp. Range, Case
ADS-937MC 0 — +70 °C
ADS-937MM/883 –55 — +125 °C
Thermal Impedance
Ĭjc — 5 — °C/Watt
Ĭca — 22 — °C/Watt
Storage Temperature Range –65 — +150 °C
Package Type 32-pin, side-brazed, metal-sealed, ceramic TDIP
Weight 0.56 ounces (16 grams)
ABSOLUTE MAXIMUM RATINGS
PARAMETERS LIMITS UNITS
+15V Supply (Pin 9) 0 to +16 Volts
–15V Supply (Pin 8) 0 to –16 Volts
+5V Supply (Pins 10, 14) 0 to +6 Volts
–5V Supply (Pin 11) 0 to -6 Volts
Digital Input (Pin 16) –0.3 to +VDD +0.3 Volts
Analog Input (Pin 1) ±15 Volts
Lead Temperature (10 seconds) +300 °C
PHYSICAL/ENVIRONMENTAL
FUNCTIONAL SPECIFICATIONS
(TA = +25°C, ±VCC = ±15V, +VDD = ±5V, 1MHz sampling rate, and a minimum 1 minute warm-up ➀ unless otherwise specifi ed.)
22 Jun 2012 MDA_ADS-937.A04 Page 2 of 8
ADS-937
16-Bit, 1MHz 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
THERMAL REQUIREMENTS
All DATEL sampling A/D converters are fully characterized and
specifi ed over operating temperature (case) ranges of 0 to +70°C
and –55 to +125°C. All room-temperature (TA = +25°C) production
testing is performed without the use of heat sinks or forced-air
cooling. Thermal impedance fi gures for each device are listed in
their respective specifi cation tables. These devices do not normally
require heat sinks, however, standard precautionary design
and layout procedures should be used to ensure devices do not
overheat. The ground and power planes beneath the package, as
well as all pcb signal runs to and from the device, should be as
heavy as possible to help conduct heat away from the package.
Electrically-insulating, thermally-conductive "pads" may be installed
underneath the package. Devices should be soldered to boards
rather than "socketed", and of course, minimal air fl ow over the
surface can greatly help reduce the package temperature.
+25°C 0 TO +70°C –55 TO +125°C
MIN. TYP. MAX. MIN. TYP. MAX. MIN. TYP. MAX. UNITS
ANALOG OUTPUT
Internal Reference
Voltage +4.95 +5.0 +5.05 +4.95 +5.0 +5.05 +4.95 +5.0 +5.05 Volts
Drift — ±30 — — ±30 — — ±30 — ppm/°C
External Current — 1 — — 1 — — 1 — mA
DIGITAL OUTPUTS
Logic Levels
Logic "1" +2.4 — — +2.4 — — +2.4 — — Volts
Logic "0" — — +0.4 — — +0.4 — — +0.4 Volts
Logic Loading "1" — — –4 — — –4 — — –4 mA
Logic Loading "0" — — +4 — — +4 — — +4 mA
Output Coding (Offset) Binary / Complementary (Offset) Binary
POWER REQUIREMENTS
Power Supply Ranges
+15V Supply +14.5 +15.0 +15.5 +14.5 +15.0 +15.5 +14.5 +15.0 +15.5 Volts
–15V Supply –14.5 –15.0 –15.5 –14.5 –15.0 –15.5 –14.5 –15.0 –15.5 Volts
+5V Supply +4.75 +5.0 +5.25 +4.75 +5.0 +5.25 +4.75 +5.0 +5.25 Volts
–5V Supply –4.75 –5.0 –5.25 –4.75 –5.0 –5.25 –4.75 –5.0 –5.25 Volts
Power Supply Currents
+15V Supply — +7 +9 — +7 +9 — +7 +9 mA
–15V Supply — -12 -17 — -12 -17 — -12 -17 mA
+5V Supply — +133 +145 — +133 +145 — +133 +145 mA
-5V Supply — -72 -80 — -72 -80 — -72 -80 mA
Power Dissipation — 1.25 1.4 — 1.25 1.4 — 1.25 1.4 Watts
Power Supply Rejection — — ±0.01 — — ±0.01 — — ±0.01 %FSR/%V
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 warm-up
periods. The device must be continuously converting during this time.
➁ Contact DATEL for other input voltage ranges.
➂ A 1MHz clock with a 500nsec positive pulse width (50% duty cycle) is used
for all production testing. Any duty cycle may be used as long as a minimum
positive pulse width of 20nsec is maintained. For applications requiring lower
sampling rates, clock frequencies less than 1MHz may be used.
➄ This is the time required before the A/D output data is valid once the analog
input is back within the specifi ed range.
TECHNICAL NOTES
1. Obtaining fully specifi ed performance from the ADS-937 requires
careful attention to pc-card layout and power supply decoupling. The
device's ground pins are not connected to each other internally. For
optimal performance, tie all ground pins (2, 12 and 13) directly to a
large analog ground plane beneath the package. The device's +5V
supply pins are not connected to each other internally and should be
connected to a clean analog +5V supply. Bypass all power sup-
plies and the +5V REFERENCE OUTPUT (pin 5) to ground with 4.7F
tantalum capacitors in parallel with 0.1F ceramic capacitors. Locate
the bypass capacitors as close to the unit as possible. Tie a 47F
capacitor between COMPENSATION (pin 7) and ground (See fi gure 2.).
2. The ADS-937 achieves its specifi ed accuracies without the need for
external 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. When using this circuitry, or any similar offset and
gain calibration hardware, make adjustments following warm-up. To
avoid interaction, always adjust offset before gain. Float pins 4 and 6
if not using offset and gain adjust circuits.
3. Applying a start convert pulse while a conversion is in progress (EOC
= logic "1") will initiate a new and inaccurate conversion cycle. Data
for the interrupted and subsequent conversions will be invalid.
➃ Effective bits is equal to:
6.02
(SNR + Distortion) – 1.76 + 20 log Full Scale Amplitude
Actual Input Amplitude
22 Jun 2012 MDA_ADS-937.A04 Page 3 of 8
ADS-937
16-Bit, 1MHz 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
3. For a bipolar input - Adjust the offset potentiometer until the
output code fl ickers equally between 1000 0000 0000 0000
and 0111 1111 1111 1111.
For a unipolar input - Adjust the offset potentiometer until all
output bits are 0's and the LSB fl ickers between 0 and 1.
GAIN ADJUST PROCEDURE
1. Apply –4.999771V to the ANALOG INPUT (pin 1) for bipolar
gain adjust or apply –9.999771V to pin 1 for unipolar gain
adjust.
2. For a unipolar input - Adjust the gain potentiometer until all
output bits are 1's and the LSB fl ickers between 1 and 0.
For a bipolar input - Adjust the gain potentiometer until all
output bits are 1's and the LSB fl ickers between 1 and 0.
3. To confi rm proper operation of the device, vary the applied
input voltage to obtain the output coding listed in Table 2.
Table 1. Setting Output Coding Selection (Pin 35)
CALIBRATION PROCEDURE
Connect the converter per Table 1 for the appropriate input
voltage range. Any offset/gain calibration procedures should
not be implemented until the device is fully warmed up. To
avoid interaction, adjust offset before gain. The ranges of
adjustment for the circuits in Figure 2 are guaranteed to
compensate for the ADS-937'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 is accomplished by connecting LED's
to the digital outputs and performing adjustments 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-937, offset adjusting is normally accomplished
when the analog input is 0 minus ½LSB (–76.3μV). See Table
2 for the proper bipolar and unipolar output coding.
Gain adjusting is accomplished when the analog input is at
nominal full scale minus 1½LSB's (–9.999771V for unipolar
and –4.999771V for bipolar).
Zero/Offset Adjust Procedure
1. Apply a train of pulses to the START CONVERT input
(pin 16) so that the converter is continuously converting.
2. For unipolar or bipolar zero/offset adjust, apply –76.3μV to
the ANALOG INPUT (pin 1).
Table 2. Output Coding
INPUT VOLTAGE RANGE INPUT PIN TIE TOGETHER
±5V Pin 1 Pins 2 and 3
0 to -10V Pin 1 Pins 3 and 5
COMPLEMENTARY BINARY COMPLEMENTARY OFFSET BINARY
UNIPOLAR
SCALE
INPUT VOLTAGE
0 to -10V
OUTPUT CODING INPUT RANGE
±5V
BIPOLAR
SCALE
MSB LSB MSB LSB
–FS +1 LSB -9.999847 1111 1111 1111 1111 0000 0000 0000 0000 +4.999847 +FS -1 LSB
–7/8 FS -8.750000 1110 0000 0000 0000 0001 1111 1111 1111 +3.750000 +3/4 FS
–3/4 FS -7.500000 1100 0000 0000 0000 0011 1111 1111 1111 +2.500000 +1/2 FS
–1/2 FS -5.000000 1000 0000 0000 0000 0111 1111 1111 1111 +0.000000 0
–1/4 FS -2.500000 0100 0000 0000 0000 1011 1111 1111 1111 -2.500000 –1/2 FS
–1/8 FS -1.250000 0010 0000 0000 0000 1101 1111 1111 1111 -3.750000 –3/4 FS
–1 LSB -0.000153 0000 0000 0000 0001 1111 1111 1111 1110 -4.999847 –FS +1 LSB
0 0.000000 0000 0000 0000 0000 1111 1111 1111 1111 -5.000000 –FS
22 Jun 2012 MDA_ADS-937.A04 Page 4 of 8
ADS-937
16-Bit, 1MHz 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
Figure 2. Typical ADS-937 Connection Diagram
2
11
ADS-937
20k:
10
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
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
BIT 15
BIT 16 (LSB)
+5VANALOG
15
ANALOG
GROUND
ANALOG
GROUND
DIGITAL
GROUND
0.1F
4.7F
0.1FUNIPOLAR
+
4.7F
+5V
REF. OUT
COMPENSATION 47F
14
13
3
5
7
START CONVERT
+5VDIGITAL
–15V
+15V
OFFSET
ADJUST
GAIN
ADJUST
46
16
0.1F
4.7F
12
9
0.1F
4.7F
8
++
0.1F
4.7F0.1F
4.7F+
+
EOC
–5VANALOG
+15V
–15V
ANALOG INPUT 1
Pin 5 (ADS-937)
10k:
Figure 3. ADS-937 Timing Diagram
Scale is approximatel
y
50ns per division.
START
CONVERT
INTERNAL S/H
NN+1
500ns typ.
Acquisition Time
260ns typ.
740ns typ.
5ns typ.
EOC
65ns typ.
Conversion Time
730ns typ.
OUTPUT
DATA Data N-2 Valid
980ns typ.
Hold
Data N-1 Valid
20ns typ. 20ns
Invalid Data
N
Note:Scale is approximately 50ns per division. Sampling Rate = 1MHz.
22 Jun 2012 MDA_ADS-937.A04 Page 5 of 8
ADS-937
16-Bit, 1MHz 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
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
–130
–140
–150
050050 100 150 200 250 300 350 400 450
kHz kHz kHz kHz kHz kHz kHz kHz kHz kHz
Frequency
(fs = 1MHz, fin = 480kHz, Vin = – 0.5dB, 16,384-point FFT)
Amplitude Re lative to Full Scale (dB)
Figure 4. FFT Analysis of ADS-937
Digital Output Code065,536
Number of Occurrences
065,536
– 0.50
Codes
DNL (LSB's)
0.63
Figure 5. ADS-937 Histogram and Differential Nonlinearity
22 Jun 2012 MDA_ADS-937.A04 Page 6 of 8
ADS-937
16-Bit, 1MHz 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
JPR3
"OFFSET ADJ."
"GAIN A DJ."
23
1
AMPLIFIER
OPTION
3
21
(MSB)
(LSB)
CONVERT
JPR2
+
+
+
10uF
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16 17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
AIN
AGND
UNIPOLAR
OFFSET ADJ.
REF. OUT
GAIN ADJ
COMP.
–15VA
+15VA
+5VA
-5VA
AGND
DGND
+5VD
EOC
(LSB) BIT 16
(MSB) BIT 1
BIT2
BIT3
BIT4
BIT5
BIT6
BIT7
BIT8
BIT9
BIT10
BIT11
BIT12
BIT13
BIT14
BIT15
ADS-937
+
+
+
14
7
3
2
1
8
10
9
11
13
12
6
5
4
14 8
71
+
+
7
6
3
2
2
1
1
3
5
7
9
11
13
15
17
19
21
23
25
27
29
31
33
2
4
6
8
10
12
14
16
18
20
22
24
26
28
32
1
12
13
14
15
16
17
18
19
20
10
11
9
8
7
6
5
4
3
234
1
12
13
14
15
16
17
18
19
20
10
11
9
8
7
6
5
4
3
2
30
1D
2D
3D
4D
5D
6D
7D
8D
LE
1Q
2Q
3Q
4Q
5Q
6Q
7Q
8Q
OC
1D
2D
3D
4D
5D
6D
7D
8D
LE
1Q
2Q
3Q
4Q
5Q
6Q
7Q
8Q
OC
C26
C27
C29
C24
U3
U3
U3
P
4
R6
P3
U3
X1
C10
C21
C9
C7
C18
C6
C5
C15 C4
C28
C25
SG3
SG4
C11
R1 C22
AR1
R2
SG1
SG2
C3
C2
C1
2P2P2P2P2P2P2P2P2P2P2P2P2P2P2P2P2P2P2P2P2P2P2P2P2P2P2P2P2P2P2P2P
U1
P2
U2
P2
OPT
START
BIT16
EOC
+5VD
+5VD
+15V
–15V
+15V
–15V
+15V
74HCT573
74HCT573
0.1uF
OPT
10uF
10uF 51
0.1uF
10uF
0.1uF
0.1uF
10uF
0.1uF
0.1uF
10uF 0.1uF
0.1uF
0.1uF
OPT
OPT
OPT
OPT
0.1uF
0.1uF
0.1uF
EXT CLK
BIT15
BIT14
BIT13
BIT12
BIT11
BIT10
BIT9
BIT8
BIT7
BIT6
BIT5
BIT4
BIT3
BIT2
BIT1
AIN
–
4
+
C12
C23
–15V
OPT
OPT
REF
JPR2
R5
20K
R4
20K
C16 22uF
C14 22uF
C17
10uF
C20
+
+5VD
R3
10
N.C.
N.C.
N.C.
P1
26
24
25
23
21
19
17
15
13
11
22
20
18
16
14
12
10
8
6
4
21
3
9
7
5
+5V
+15V
–15V
–5V
+5VD
STARTCONVERT
+5VD
+5VD
UUT
+
C19 C8
+5VA
10uF 0.1uF
+
+
Figure 6. ADS-937 Evaluation Board.
22 Jun 2012 MDA_ADS-937.A04 Page 7 of 8
ADS-937
16-Bit, 1MHz 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
MECHANICAL DIMENSIONS INCHES (MM)
ORDERING INFORMATION
Receptacles for PC board mounting can be ordered through AMP, Inc., Part # 3-331272-8 (Component Lead
Socket), 32 required. For availabilty of MIL-STD-883 product, contact DATEL.
Figure 7. ADS-937 Grounded Input Histogram
1.62 MAX.
(41.15)
0.92 MAX.
(23.37)
0.018 TYP.
(0.46)
1.50 TYP
(38.10)
0.100 TYP.
(2.54)
0.05 TYP.
(1.27) 0.175 TYP
(4.45)
0.05 TYP.
(1.27)
0.220 TYP.
(6.86)
0.90 TYP.
(22.86)
0.010 TYP.
(0.254)
Dimension Tolerances
(unless otherwise indicated):
2 place decimal (.XX) ±0.010 (±0.254)
3 place decimal (.XXX) ±0.005 (±0.127)
Lead Material: Kovar Alloy
Lead Finish: 50 microinches (minimum)
gold plating over 100 microinches
(nominal) nickel plating
PIN 1 INDEX
0.05 TYP.
(
1.27
)
SEATING PLANE
MODEL
NUMBER OPERATING TEMPERATURE RANGE
32-PIN
PACKAGE ACCESSORIES
ADS-937MC 0 to +70ºC TDIP
ADS-B937 Evaluation Board
(without ADS937)
ADS-937MM -55 to +125ºC TDIP
ADS-937/883 -55 to +125ºC TDIP
This histogram represents the typical
peak-to- peak noise (including quantiza-
tion noise) associated with the ADS-937.
Digital Output Code
0.00
4000
3000
2000
1000
5000
22 Jun 2012 MDA_ADS-937.A04 Page 8 of 8
ADS-937
16-Bit, 1MHz 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.
www.datel.com • e-mail: help@datel.com
®®
DATEL
11 Cabot Boulevard, Mansfi eld, MA 02048-1151 USA
ITAR and ISO 9001/14001 REGISTERED