
ADS -941
14-Bit, 1MHz
Sampling A/D Converters
FEATURES
14-bit resolution
1MHz minimum sampling rate
Functionally complete
Internal reference and sample/hold
No missing codes
Excellent performance
Full Nyquist-rate sampling
Small 32–pin DIP
Low power, 2.8 Watts
GENERAL DESCRIPTION
DATEL's ADS-941 is a functionally complete, 14-bit, 1MHz,
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, a three-state output register, and all the timing and
control logic necessary to operate from a single start convert
pulse.
The ADS-941 is optimized for wideband frequency-domain
applications and is fully FFT tested. Total harmonic distortion
(THD) and signal-to-noise ratio (including distortion) typically
run at –85dB and 80dB, respectively, with full-scale inputs up
to 100kHz.
The ADS-941 requires ±15V and +5V supplies and typically
consumes 2.8 Watts.
INPUT/OUTPUT CONNECTIONS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
+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
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
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)
PIN
FUNCTION
PIN
FUNCTION
Figure 1. ADS-941 Functional Block Diagram
REF
R
R
31 BIT 1 OUT (MSB)
30 BIT 1 OUT (MSB)
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)
TIMING AND
CONTROL LOGIC
+10V REF. OUT 1
START CONVERT 32
EOC 16
D
DAC
FLASH
ADC
BUFFER
ANALOG INPUT 3
S
2
S
1
4
SIGNAL
GROUND
11
DIGITAL
GROUND
12
+15V
SUPPLY
3
S/H
OFFSET
CIRCUIT
BIPOLAR 2
OFFSET ADJUST 5
10
+5V
SUPPLY
6, 14, 15
ANALOG
GROUND
8
CODING
SELECT
13
–5V
SUPPLY
9 ENABLE
7 OVERFLOW
DATEL, Inc., 11 Cabot Boulevard, Mansfield, MA 02048-1151 (U.S.A.)
Tel: (508) 339-3000 Fax: (508) 339-6356
For immediate assistance: (800) 233-2765