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Figure 1. ADS-112 Functional Block Diagram

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

ADS-112

12-Bit, 1MHz, Low-Power

Sampling A/D Converters

FEATURES

• 12-bit resolution

• No missing codes

• 1MHz minimum sampling rate

• Functionally complete

• Small 24-pin DDIP

• Low-power, 1.3 Watts

• Three-state output buffers

• Samples to Nyquist frequencies

GENERAL DESCRIPTION

DATEL’s ADS-112 is a 12-bit, functionally complete, sampling

A/D converter that is packaged in a space-saving 24-pin DDIP.

Requiring ±15V and +5V supplies, a minimum sampling rate of

1MHz is achieved while only dissipating 1.3 Watts. The

ADS-112 digitizes signals up to Nyquist frequencies. Models

are available for use in either commercial (0 to + 70°C) or

military (–55 to +125°C) operating temperature ranges.

Typical applications include spectrum, transient, vibration and

waveform analysis. This device is also ideally suited for radar,

sonar, video digitization, medical instrumentation and high-

speed data acquisition systems.

INPUT/OUTPUT CONNECTIONS

PIN

FUNCTION

PIN

FUNCTION

1

BIT 12 (LSB)

24

–15V SUPPLY

2

BIT 11

23

ANALOG GROUND

3

BIT 10

22

+15V SUPPLY

4

BIT 9

21

+10V REFERENCE

5

BIT 8

20

BIPOLAR

6

BIT 7

19

ANALOG INPUT

7

BIT 6

18

COMP BIN

8

BIT 5

17

ENABLE (1-12)

9

BIT 4

16

START CONVERT

10

BIT 3

15

EOC

11

BIT 2

14

DIGITAL GROUND

12

BIT 1 (MSB)

13

+5V SUPPLY

REF

12 BIT 1 (MSB)

11 BIT 2

10 BIT 3

9

BIT 4

8

BIT 5

7

BIT 6

6

BIT 7

5

BIT 8

4

BIT 9

3

BIT 10

2

BIT 11

1

BIT 12 (LSB)

TIMING AND

CONTROL LOGIC

BIPOLAR 20

+10V REF. 21

START CONVERT 16

EOC 15

DAC

FLASH

ADC

COMP BIN 18

BUFFER

–

+

S/H

ANALOG INPUT 19

17 ENABLE (1-12)

13

+5V SUPPLY

22

+15V SUPPLY

23

ANALOG GROUND

14

DIGITAL GROUND

24

–15V SUPPLY