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ADS-941

14-Bit, 1MHz Sampling A/D Converters

Murata Power Solutions 

®

®

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.

ADS-941

14-Bit, 1MHz

Sampling A/D Converters

INPUT/OUTPUT CONNECTIONS

PIN FUNCTION

1

+10V REF. OUT

2

BIPOLAR

3

ANALOG INPUT

4

SIGNAL GROUND

5

OFFSET ADJUST

6

ANALOG GROUND

7

OVERFLOW

8

CODING SELECT

9

ENABLE

10 +5V SUPPLY

11 DIGITAL GROUND

12 +15V SUPPLY

13 –15V SUPPLY

14 ANALOG GROUND

15 ANALOG GROUND

16 EOC

PIN FUNCTION

32 START CONVERT

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)

+10V REF. OUT 1

OFFSET ADJUST 5

BIPOLAR 2

ANALOG INPUT 3

OFFSET

CIRCUIT

S/H

REF

S2

FLASH

ADC

S1

BUFFER

DAC

START CONVERT 32

EOC 16

TIMING AND

CONTROL LOGIC

4

SIGNAL

GROUND

10

+5V

SUPPLY

11

DIGITAL

GROUND

12

+15V

SUPPLY

6, 14, 15

ANALOG

GROUND

13

–5V

SUPPLY

Figure 1. ADS-941 Functional Block Diagram

8

CODING

SELECT

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)

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

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