®
®
ADS-942
14-Bit, 2MHz
Sampling A/D Converters
FEATURES
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14-bit resolution
2MHz minimum throughput
Functionally complete
Internal reference and sample/hold
-85dB total harmonic distortion
78dB signal-to-noise ratio
Full Nyquist-rate sampling
Small 32-pin DIP
Low-power, 2.9 Watts
GENERAL DESCRIPTION
DATEL's ADS-942 is a functionally complete, 14-bit, 2MHz,
sampling A/D converter. Its standard, 32-pin, triple-wide
ceramic DIP contains a fast-settling sample/hold amplifier, a
14-bit subranging (two-pass) A/D converter, a precision
reference, three-state output register and all the timing and
control logic necessary to operate from a single start
convert pulse.
The ADS-942 is optimized for wideband frequency-domain
applications and is fully FFT tested. The ADS-942 requires
±15V and +5V supplies and typically consumes 2.9 Watts.
PIN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
INPUT/OUTPUT CONNECTIONS
FUNCTION
+10V REF. OUT
BIPOLAR
ANALOG INPUT
SIGNAL GROUND
OFFSET ADJUST
ANALOG GROUND
OVERFLOW
CODING SELECT
ENABLE
+5V SUPPLY
DIGITAL GROUND
+15V SUPPLY
–15V SUPPLY
ANALOG GROUND
ANALOG GROUND
EOC
PIN
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
FUNCTION
START CONVERT
BIT 1 OUT (MSB)
BIT 1 OUT (MSB)
BIT 2 OUT
BIT 3 OUT
BIT 4 OUT
BIT 5 OUT
BIT 6 OUT
BIT 7 OUT
BIT 8 OUT
BIT 9 OUT
BIT 10 OUT
BIT 11 OUT
BIT 12 OUT
BIT 13 OUT
BIT 14 OUT (LSB)
DAC
31 BIT 1 OUT (MSB)
30 BIT 1 OUT (MSB)
+10V REF. OUT 1
OFFSET
CIRCUIT
S
2
FLASH
ADC
BIPOLAR 2
S
1
BUFFER
REF
DIGITAL CORRECTION LOGIC
3-STATE OUTPUT REGISTER
29 BIT 2 OUT
28 BIT 3 OUT
27 BIT 4 OUT
26 BIT 5 OUT
25 BIT 6 OUT
24 BIT 7 OUT
23 BIT 8 OUT
22 BIT 9 OUT
21 BIT 10 OUT
20 BIT 11 OUT
19 BIT 12 OUT
18 BIT 13 OUT
17 BIT 14 OUT (LSB)
START CONVERT 32
TIMING AND
CONTROL LOGIC
EOC 16
9 ENABLE
7 OVERFLOW
4
SIGNAL
GROUND
10
+5V
SUPPLY
11
DIGITAL
GROUND
12
+15V
SUPPLY
6, 14, 15
ANALOG
GROUND
13
–15V
SUPPLY
8
CODING
SELECT
OFFSET ADJUST 5
Figure 1. ADS-942 Functional Block Diagram
DATEL, Inc., 11 Cabot Boulevard, Mansfield, MA 02048-1151 (U.S.A.)
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Tel: (508) 339-3000 Fax: (508) 339-6356
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For immediate assistance: (800) 233-2765
REGISTER
ANALOG INPUT 3
S/H
REGISTER
MURATA-PS [ MURATA POWER SOLUTIONS INC. ]
