3

DESCRIPTION…

The HS574A/SP674A Series are complete 12–bit successive–approximation A/D converters

integrated on a single die with tri-state output latches, an internal reference, clock and a sample–

hold. They feature 12–bit linearity over temperature, low power dissipation and fast conversion

time. They are available in commercial and military temperature ranges.

Hold, Reference, Clock and Tri–state Outputs

25

µs Max (HS574A)

15

µs Max (SP674A)

HS574A/SP674A

12–Bit Sampling A/D Converters

1

14

13

12

11

10

9

8

7

6

5

4

3

2

28

15

16

17

18

19

20

21

22

23

24

25

26

27

STS

DB11

DB10

DB9

DB8

DB7

DB6

DB5

DB4

DB3

DB2

DB1

DB0

DGND

VLOGIC 12/8

CS

A0

R/C

CE

VCC

REF

OUT

AGND

REF

IN

VEE

BIP

OFF

10V

IN

20V

IN

NIBBLE A

NIBBLE B

NIBBLE C

THREE–STATE BUFFERS AND CONTROL

N/C

7.5K

15K

15K

7.5K

7.5K

OFFSET/GAIN

TRIM

12–BIT

CAPACITANCE

DAC

COMP

REF

CONTROL LOGIC

12–BIT SAR

OSC