®

®

ADS-942

14-Bit, 2MHz

Sampling A/D Converters

FEATURES

• 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.

INPUT/OUTPUT CONNECTIONS

1

+10V REF. OUT

32

START CONVERT

2

BIPOLAR

31

BIT 1 OUT (MSB)

3

ANALOG INPUT

30

BIT 1 OUT (MSB)

4

SIGNAL GROUND

29

BIT 2 OUT

5

OFFSET ADJUST

28

BIT 3 OUT

6

ANALOG GROUND

27

BIT 4 OUT

7

OVERFLOW

26

BIT 5 OUT

8

CODING SELECT

25

BIT 6 OUT

9

ENABLE

24

BIT 7 OUT

10

+5V SUPPLY

23

BIT 8 OUT

11

DIGITAL GROUND

22

BIT 9 OUT

12

+15V SUPPLY

21

BIT 10 OUT

13

–15V SUPPLY

20

BIT 11 OUT

14

ANALOG GROUND

19

BIT 12 OUT

15

ANALOG GROUND

18

BIT 13 OUT

16

EOC

17

BIT 14 OUT (LSB)

PIN

FUNCTION

PIN

FUNCTION

Figure 1. ADS-942 Functional Block Diagram

REF

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

DAC

FLASH

ADC

BUFFER

ANALOG INPUT 3

4

SIGNAL

GROUND

11

DIGITAL

GROUND

12

+15V

SUPPLY

S/H

OFFSET

CIRCUIT

BIPOLAR 2

OFFSET ADJUST 5

10

+5V

SUPPLY

6, 14, 15

ANALOG

GROUND

8

CODING

SELECT

13

–15V

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