®
ADS-932
®
16-Bit, 2 MHz Sampling A/D Converters
PRODUCT OVERVIEW
The low-cost ADS-932 is a 16-bit, 2MHz 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-932 has
been optimized to achieve a signal-to-noise ratio (SNR)
of 87dB and a total harmonic distortion (THD) of –88dB.
Packaged in a 40-pin TDIP, the functionally complete
ADS-932 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-932 only requires
the rising edge of the start convert pulse to operate.
Requiring only ±5V supplies, the ADS-932 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 –40 to +100°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
HI-REL temperature range. Typical applications include
medical imaging, radar, sonar, communications and
instrumentation.
FEATURES
16-bit resolution
2MHz sampling rate
Functionally complete
missing codes over full HI-REL temperature
No
range
Edge-triggered
supplies, 1.85 Watts
±5V
Small, 40-pin, ceramic TDIP
SNR, –88dB THD
87dB
for both time and frequency-domain
Ideal
applications
PIN
INPUT/OUTPUT CONNECTIONS
FUNCTION
PIN FUNCTION
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
+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
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
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
BLOCK DIAGRAM
10 FSTAT1
11 FSTAT2
GAIN ADJUST 6
GAIN
ADJUST
CKT.
8 FIFO/DIR
9 FIFO/READ
29 BIT 1 (MSB)
ANALOG GROUND
4, 36
DIGITAL GROUND
7, 30
+5V DIGITAL SUPPLY
31
–5V SUPPLY
37
+5V ANALOG SUPPLY
OFFSET ADJUST 5
OFFSET
ADJUST
CKT.
38
NO CONNECTION
39, 40
ANALOG INPUT 3
S/H
26 BIT 3
25 BIT 4
3-STATE
OUTPUT REGISTER
POWER and GROUNDING
27 BIT 2
CUSTOM GATE ARRAY
PRECISION
+3.2V REFERENCE
2-PASS ANALOG-TO-DIGITAL CONVERTER
28 BIT 1 (MSB)
+3.2V REF. OUT 1
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
13 BIT 16 (LSB)
START CONVERT 12
EOC 32
34 OUTPUT ENABLE
TIMING AND
CONTROL LOGIC
33 OVERFLOW
COMP. BITS 35
Figure 1. ADS-932 Functional Block Diagram
DATEL
•
11 Cabot Boulevard, Mansfield, MA 02048-1151 USA
•
Tel: (508) 339-3000
•
www.datel.com
•
e-mail: help@datel.com
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