®

®

ADS-926

14-Bit, 500kHz, Low-Power

Sampling A/D Converters

Figure 1. ADS-926 Functional Block Diagram

FEATURES

• 14-bit resolution

• 500kHz sampling rate

• Functionally complete; No missing codes

• Small 24-pin DDIP or SMT package

• Operates from ±15V or ±12V supplies

• Low power, 1.75 Watts maximum

• Samples up to Nyquist frequencies

• Outstanding dynamic performance

• Bipolar ±5V input range

GENERAL DESCRIPTION

The ADS-926 is a high-performance, 14-bit, 500kHz sampling

A/D converter. This device accurately samples full-scale input

signals up to Nyquist frequencies with no missing codes and

exhibits outstanding dynamic performance that surpasses

most 16-bit, 500kHz sampling A/D's. THD and SNR, for

example, are typically –90dB and 80dB when converting full-

scale input signals up to 100kHz.

Housed in a small 24-pin DDIP or SMT (gull-wing) package,

the functionally complete ADS-926 contains a fast-settling

sample-hold amplifier, a subranging (two-pass) A/D converter,

a precise voltage reference, timing/control logic, and error-

correction circuitry. Digital input and output levels are TTL.

Requiring ±15V (or ±12V) and +5V supplies, the ADS-926

dissipates only 1.75W (1.6W for ±12V), maximum. The unit is

offered with a bipolar input (–5V to +5V). Models are available

for use in either commercial (0 to +70°C) or military (–55 to

+125°C) operating temperature ranges.

Applications include radar, sonar, spectrum analysis, and

graphic/medical imaging. Contact DATEL for information on

devices screened to MIL-STD-883.

INPUT/OUTPUT CONNECTIONS

PIN

FUNCTION

PIN

FUNCTION

1

BIT 14 (LSB)

24

–12V/–15V SUPPLY

2

BIT 13

23

ANALOG GROUND

3

BIT 12

22

+12V/+15V SUPPLY

4

BIT 11

21

+10V REFERENCE OUT

5

BIT 10

20

ANALOG INPUT

6

BIT 9

19

ANALOG GROUND

7

BIT 8

18

BIT 1 (MSB)

8

BIT 7

17

BIT 2

9

BIT 6

16

START CONVERT

10

BIT 5

15

EOC

11

BIT 4

14

DIGITAL GROUND

12

BIT 3

13

+5V SUPPLY

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

REF

18 BIT 1 (MSB)

17 BIT 2

12 BIT 3

11 BIT 4

10 BIT 5

9

BIT 6

8

BIT 7

7

BIT 8

6

BIT 9

5

BIT 10

4

BIT 11

3

BIT 12

2

BIT 13

1

BIT 14 (LSB)

TIMING AND

CONTROL LOGIC

+10V REF. OUT 21

START CONVERT 16

EOC 15

DAC

FLASH

ADC

BUFFER

–

+

S/H

ANALOG INPUT 20

13

+5V SUPPLY

22

+12V/+15V SUPPLY

19, 23

ANALOG GROUND

14

DIGITAL GROUND

24

–12V/–15V SUPPLY