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October 1997

ICL7121

16-Bit Multiplying

Microprocessor-Compatible D/A Converter

Features

• 16-Bit Resolution

• Low Integral Linearity Error -0.003% FSR

• Monotonic to 16 Bits Over Full Military Temperature

Range (LM Grade)

• Microprocessor Compatible with Buffered Inputs

• Bipolar Application Requires No External Resistors

• Output Current Settling Time 3

µs Max (1µs Typ)

• Low Linerarity and Gain Temperature Coefficients

• Low Power Dissipation (25mW)

• Full Four-Quadrant Multiplication

• Low Differential Nonlinearity Error at Bipolor Zero

Description

The ICL7121 achieves 0.003% linearity without laser

trimming by combining a four quadrant multiplying DAC

using thin film resistors with an on-chip PROM-controlled

correction circuit. Silicon-gate CMOS circuitry keeps the

power dissipation very low.

Microprocessor bus interfacing is eased using standard

memory WRITE cycle timing and control. The input buffer

register is loaded with the 16-bit input and directly controls

the output switches. The register is transparent if WR and

CS are held low.

The ICL7121 is designed and programmed for bipolar

operation. There is an offset resistor to the output which

line, giving the DAC a 2’s complement bipolar transfer

function. Two extra resistors are included on the chip to

facilitate the reference inversion, so that only an external op-

amp is needed.

Pinout

ICL7121

(OUTLINE DWG JI)

TOP VIEW

Ordering Information

PART NUMBER

TEMP. RANGE

PACKAGE

ICL7121JCJI

0 to 70

28 Ld CERDIP

ICL7121JMJI

-55 to 125

28 Ld CERDIP

ICL7121KCJI

0 to 70

28 Ld CERDIP

ICL7121KMJI

-55 to 125

28 Ld CERDIP

ICL7121LCJI

0 to 70

28 Ld CERDIP

ICL7121LMJI

-55 to 125

28 Ld CERDIP

28

27

26

25

24

23

22

21

20

19

18

17

16

15

1

2

3

4

5

6

7

8

9

10

11

12

13

14

CS

V+

PROG

WR

DGND

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

1-888-INTERSIL or 321-724-7143

Copyright © Intersil Americas Inc. 2002. All Rights Reserved

File Number

3112.1

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