SP574B/674B/1674B/774B

12–Bit Sampling A/D Converters

© Copyright 2000 Sipex Corporation

1

with Sample–Hold, Reference, Clock and Tri–

state Outputs

100kHz or 125kHz

ture Ranges

1674A, 774A Devices

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

DESCRIPTION…

The SP574B/674B/1674B/774B (SPx74B) Series are complete 12–bit successive–approxi-

mation A/D converters integrated on a single die with tri-state output latches, an internal

reference, clock and a sample–hold. The new “B–Series” features true Nyquist sampling while

maintaining compatibility with prior versions. They are drop–in replacements for the older 574A/

674A/1674A/774A type devices.

®

SP574B/674B/1674B/774B

12–Bit Sampling A/D Converters