FEATURES

• 8-Bit flash A/D converter

• 20MHz sampling rate

• Complete support circuitry

• Low power, 1.5W

• 7MHz full power bandwidth

• Sample-hold not required

• Three-state outputs

• MIL-STD-883 versions

GENERAL DESCRIPTION

The ADC-228 combines analog front-end circuitry and a flash

A/D converter to digitize high-speed analog signals at a rate of

20 million samples per second. The ADC-228 contains an

8-bit, 20MHz, flash A/D, a wideband analog input buffer, a

precision voltage reference, temperature compensation

circuitry, reference trims, and a three-state output buffer in a

24-pin package.

The ADC-228 offers significant savings by combining all of the

circuitry in a single package. Valuable board real estate is

saved, and design time and manufacturing costs are reduced.

The ADC-228 is housed in a 24-pin ceramic DDIP package

and is available in the commercial, 0 to +70°C, or military,

–55 to +125°C, temperature ranges. A MIL-STD-883 version

is also available. Operation is from ±15V and +5V power

supplies.

IN N O VA T IO N a n d E X C ELL E N C E

®

®

ADC-228

8-Bit, 20MHz, Complete

Flash A/D Converter

Figure 1. Functional Block Diagram

PIN

FUNCTION

PIN

FUNCTION

1

+5V SUPPLY

24

BIT 8 (LSB)

2

GROUND

23

BIT 7

3

+5V REFERENCE OUT

22

BIT 6

4

GROUND

21

BIT 5

5

ANALOG INPUT

20

NO CONNECTION

6

GROUND

19

+15V SUPPLY

7

GROUND

18

CLOCK INPUT

8

NLINV

17

BIT 4

9

NMINV

16

BIT 3

10

–15V SUPPLY

15

BIT 2

11

CS1

14

BIT 1 (MSB)

12

CS1

13

NO CONNECTION

INPUT/OUTPUT CONNECTIONS

13 NO CONNECTION

20 NO CONNECTION

14 BIT 1 (MSB)

15 BIT 2

16 BIT 3

17 BIT 4

21 BIT 5

22 BIT 6

23 BIT 7

24 BIT 8 (LSB)

3 +5V REF. OUT

TRI-STATE

BUFFER

8-BIT

20MHz

FLASH

CONVERTER

LINEARIZATION

& TEMPERATURE

COMPENSATION

NETWORK

INPUT

BUFFER

CS1 11

CS1 12

NLINV 8

NMINV 9

CLOCK 18

ANALOG INPUT 5

+15V SUPPLY 19

GROUND 4

GROUND 7

GROUND 6

–15V SUPPLY 10

+5V SUPPLY 1

VOLTAGE

REFERENCE

NETWORK

GROUND 2

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