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16-Bit Digital to Analog Converter

7846A

©2003 Maxwell Technologies

All rights reserved.

05.29.03 REV 5

space radiation

• Total dose hardness:

- > 100 krad (Si), depending upon space mission

• Excellent Single Event Effects

- SEL

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• Package:

• Microprocessor compatible with readback capability

• 16-Bit monotonicity over temperature

• ±2 LSBs integral linearity error

• Unipolar or bipolar output

• Multiplying capability

• Low power (100 mW typical)

Maxwell Technologies’ 7846A 16-Bit DAC converter microcir-

cuit features a greater than 100 krad (Si) total dose tolerance,

depending upon space mission. The 7846A has V

V

gives the option of unipolar or bipolar output. The 7846A uses

a segmented architecture. The 4 MSBs in the DAC latch

select one of the segments in a 16-resistor string. Both taps of

the segment are buffered by amplifiers and fed to a 12-bit

DAC, which provides a further 12 bits of resolution. This archi-

tecture ensures 16-bit monotonicity. Excellent integral linearity

results from tight matching between the input offset voltages

of the two buffer amplifiers. In addition to the excellent accu-

racy specifications, the 7846A also offers a comprehensive

microprocessor interface. There are 16 data I/O pins, plus

control lines (CS, R/W, LDAC and CLR). R/W and CS have

readback function which allows writing to and reading from the

I/O latch.

ogy incorporates radiation shielding in the microcircuit pack-

age. It eliminates the need for box shielding while providing

the required radiation shielding for a lifetime in orbit or space

krad (Si) radiation dose tolerance. This product is available

with screening up to Class S.

16

Segment

Switch

Matrix

Control

Logic

A2

A1

A3

I/O Latch

DAC Latch

12-bit DAC

-

+

-

+

-

+

R

R

6

5

23

22

25

24

20

3

10

9

8

7

21

4

V

DD

V

CC

V

REF+

V

REF-

V

SS

DB15

DB0

DGND

CLR

LDAC

R/W

CS

V

OUT

R

IN

12

12

4

R

R

R

Logic Diagram

7846A