®
®
ADS-931
16-Bit, 1MHz
Sampling A/D Converters
INNOVATION and EXCELLENCE
FEATURES
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16-bit resolution
1MHz sampling rate
Functionally complete
No missing codes over full military temperature range
Edge-triggered
±5V supplies, 1.85 Watts
Small, 40-pin, ceramic TDIP
87dB SNR, –89dB THD
Ideal for both time and frequency-domain applications
PIN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
INPUT/OUTPUT CONNECTIONS
FUNCTION
+3.2V REF. OUT
UNIPOLAR
ANALOG INPUT
ANALOG GROUND
OFFSET ADJUST
GAIN ADJUST
DIGITAL GROUND
FIFO/DIR
FIFO READ
FSTAT1
FSTAT2
START CONVERT
BIT 16 (LSB)
BIT 15
BIT 14
BIT 13
BIT 12
BIT 11
BIT 10
BIT 9
PIN
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
FUNCTION
NO CONNECTION
NO CONNECTION
+5V ANALOG SUPPLY
–5V SUPPLY
ANALOG GROUND
COMP. BITS
OUTPUT ENABLE
OVERFLOW
EOC
+5V DIGITAL SUPPLY
DIGITAL GROUND
BIT 1 (MSB)
BIT 1 (MSB)
BIT 2
BIT 3
BIT 4
BIT 5
BIT 6
BIT 7
BIT 8
GENERAL DESCRIPTION
The low-cost ADS-931 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. The
dynamic performance of the ADS-931 has been optimized to
achieve a signal-to-noise ratio (SNR) of 87dB and a total
harmonic distortion (THD) of –89dB.
Packaged in a 40-pin TDIP, the functionally complete ADS-931
contains a fast-settling sample-hold amplifier, 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-931 only requires the rising edge of the start
convert pulse to operate.
Requiring only ±5V supplies, the ADS-931 dissipates 1.85
Watts. The device is offered with a bipolar (±2.75V) analog
input range or a unipolar (0 to –5.5V) input range. 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 specified performance over the full military
temperature range. Typical applications include medical
imaging, radar, sonar, communications and instrumentation.
10 FSTAT1
11 FSTAT2
GAIN ADJUST 6
GAIN
ADJUST
CKT.
8 FIFO/DIR
9 FIFO/READ
29 BIT 1 (MSB)
28 BIT 1 (MSB)
+3.2V REF. OUT 1
POWER and GROUNDING
ANALOG GROUND
DIGITAL GROUND
+5V DIGITAL SUPPLY
–5V SUPPLY
+5V ANALOG SUPPLY
NO CONNECTION
4, 36
7, 30
31
37
38
39, 40
ANALOG INPUT 3
S/H
UNIPOLAR 2
OFFSET ADJUST 5
OFFSET
ADJUST
CKT.
PRECISION
+3.2V REFERENCE
2-PASS ANALOG-TO-DIGITAL CONVERTER
27 BIT 2
26 BIT 3
25 BIT 4
CUSTOM GATE ARRAY
3-STATE
OUTPUT REGISTER
24 BIT 5
23 BIT 6
22 BIT 7
21 BIT 8
20 BIT 9
19 BIT 10
18 BIT 11
17 BIT 12
16 BIT 13
15 BIT 14
14 BIT 15
OFFSET ADJUST 5
START CONVERT 12
EOC 32
COMP. BITS 35
TIMING AND
CONTROL LOGIC
13 BIT 16 (LSB)
34 OUTPUT ENABLE
33 OVERFLOW
Figure 1. ADS-931 Functional Block Diagram
DATEL, Inc., Mansfield, MA 02048 (USA)
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Tel: (508)339-3000, (800)233-2756 Fax: (508)339-6356
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E-mail:sales@datel.com
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Internet: www.datel.com
MURATA-PS [ MURATA POWER SOLUTIONS INC. ]
