Quad 12-Bit Serial

Voltage Output DAC

DAC8420

Rev. B

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FEATURES

Guaranteed monotonic over temperature

Excellent matching between DACs

Unipolar or bipolar operation

Buffered voltage outputs

High speed serial digital interface

Reset-to-zero scale or midscale

Wide supply range, +5 V only to ±15 V

Low power consumption (35 mW maximum)

Available in 16-Lead PDIP, SOIC, and CERDIP packages

APPLICATIONS

Software controlled calibration

Servo controls

Process control and automation

ATE

FUNCTIONAL BLOCK DIAGRAM

9

GND

16

15

4

8

14

13

11

12

10

5

1

2

3

6

7

REG

D

DAC D

REG

C

DAC C

REG

B

DAC B

REG

A

DAC A

SHIFT

REGISTER

DECODE

SDI

CS

CLK

NC

LD

CLSEL CLR

VREFLO

VSS

VOUTA

VOUTB

VOUTC

VOUTD

VREFHI

VDD

12

4

2

DAC8420

Figure 1.

GENERAL DESCRIPTION

The DAC8420 is a quad, 12-bit voltage-output DAC with serial

digital interface in a 16-lead package. Utilizing BiCMOS tech-

nology, this monolithic device features unusually high circuit

density and low power consumption. The simple, easy-to-use

serial digital input and fully buffered analog voltage outputs

require no external components to achieve a specified per-

formance.

The 3-wire serial digital input is easily interfaced to micro-

processors running at 10 MHz with minimal additional

circuitry. Each DAC is addressed individually by a 16-bit

serial word consisting of a 12-bit data word and an address

header. The user-programmable reset control CLR forces all

four DAC outputs to either zero scale or midscale,

asynchronously overriding the current DAC register values. The

output voltage range, determined by the inputs VREFHI and

VREFLO, is set by the user for positive or negative unipolar or

bipolar signal swings within the supplies, allowing considerable

design flexibility.

The DAC8420 is available in 16-lead PDIP, SOIC, and CERDIP

packages. Operation is specified with supplies ranging from

+5 V only to ±15 V, with references of +2.5 V to ±10 V, respec-

tively. Power dissipation when operating from ±15 V supplies is

less than 255 mW (maximum) and only 35 mW (maximum)

with a +5 V supply.