INPUT/OUTPUT CONNECTIONS

PLASTIC DIP PACKAGE

PIN

FUNCTION

PIN

FUNCTION

1

BIT 1 (MSB)

28

MINV

2

BIT 2

27

3

BIT 3

26

4

BIT 4

25

ANALOG GND

5

DIGITAL GND

24

NO CONNECT

6

+5V POWER

23

ANALOG INPUT

7

–5.2V POWER

22

NO CONNECT

8

–5.2V POWER

21

ANALOG INPUT

9

–5.2V POWER

20

NO CONNECT

10

+5V POWER

19

ANALOG GND

11

DIGITAL GND

18

12

LINV

17

CLOCK INPUT

13

BIT 5

16

BIT 8 (LSB)

14

BIT 6

15

BIT 7

FEATURES

• 8-bit resolution

• 20MHz conversion rate

• ±1/2LSB maximum nonlinearity

• 8MHz input bandwidth

• Low power consumption, 375mW

• TTL compatible

• Single or dual supply operation

GENERAL DESCRIPTION

Datel’s ADC-304 is an 8-bit, 20MHz analog-to-digital flash

converter. The ADC-304 offers many performance features not

obtainable from other flash A/D’s.

Key reatures include a low power dissipation of 375mW and

TTL-compatible outputs. A wide analog input bandwidth of

8MHz (–3dB) allows operation without the need of a sample-

hold. Also, single +5V supply operation is obtainable with an

input range of +3 to +5V, eliminating the need for an additional

power supply. A 0 to –2V input range is available with ±5V

supply operation.

Another novel feature of the ADC-304 is its user-selectable

output coding. The MINV and LINV pins allow selection of

binary, complementary binary, and if external offset circuitry is

used for bipolar inputs, offset binary, two’s complement and

complementary two’s complement coding.

The ADC-304 is supplied in a 28-pin plastic DIP or a 28-pin

plastic SOP package. Operating temperature range is –20 to

+75°C. Storage temperature range is –55 to +150°C.

INPUT/OUTPUT CONNECTIONS

PLASTIC SOP PACKAGE

PIN

FUNCTION

PIN

FUNCTION

1

ANALOG INPUT

28

ANALOG INPUT

2

27

3

ANALOG GND

26

ANALOG GND

4

25

5

24

CLOCK INPUT

6

NO CONNECT

23

BIT 8 (LSB)

7

MINV

22

BIT 7

8

BIT 1 (MSB)

21

BIT 6

9

BIT 2

20

BIT 5

10

BIT 3

19

LINV

11

BIT 4

18

DIGITAL GND

12

DIGITAL GND

17

+5V POWER

13

+5V POWER

16

OVERRANGE

14

–5.2V POWER

15

–5.2V POWER

Figure 1. ADC-304 Functional Block Diagram

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

®

®

BIT 1 (MSB)

BIT 2

BIT 3

BIT 4

OVERRANGE Œ

CLOCK

INPUT

BIT 8 (LSB)

LINV

BIT 7

BIT 6

BIT 5

ANALOG

INPUT

R/2

R/2

R/2

R

R

R

R

7

6

6

6

6

COMPARATOR

LATCH

1

256

129

128

3

2

1

MINV

ANALOG

INPUT

ADC-304

8-Bit, 20MHz, Low-Power

Flash A/D Converters

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