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General Description

The MX7841 contains eight 14-bit, voltage-output digi-

tal-to-analog converters (DACs). On-chip precision out-

put amplifiers provide the voltage outputs. The device

operates from ±15V supplies. Its bipolar output voltage

achieved with no external components. The MX7841

has three pairs of differential reference inputs; two of

these pairs are connected to two DACs each, and a

third pair is connected to four DACs. The references

are independently controlled, providing different full-

scale output voltages to the respective DACs.

The MX7841 features double-buffered interface logic

with a 14-bit parallel data bus. Each DAC has an input

latch and a DAC latch. Data in the DAC latch sets the

output voltage. The eight input latches are addressed

with three address lines. Data is loaded to the input

latch with a single write instruction. An asynchronous

load input (LDAC) transfers data from the input latch to

the DAC latch. The LDAC input controls all DACs;

therefore, all DACs can be updated simultaneously by

asserting LDAC.

An asynchronous CLR input sets the output of all eight

DACs to the respective DUTGND input of the op amp.

Note that CLR is a CMOS input, which is powered by

The MX7841 is pin-for-pin compatible with AD7841.

Applications

Automatic Test Equipment (ATE)

Industrial Process Controls

Arbitrary Function Generators

Avionics Equipment

Minimum Component Count Analog Systems

Digital Offset/Gain Adjustment

SONET Applications

Features

o Full 14-Bit Performance Without Adjustments

o Eight DACs in a Single Package

o Buffered Voltage Outputs

o 31µs Output Settling Time

o Low Power Consumption: 8mA (typ)

o Small 44-Pin MQFP Package

o Double-Buffered Digital Inputs

o Asynchronous Load Updates All DACs

Simultaneously

o Asynchronous CLR Forces All DACs to

DUTGND_ _ Potential

Octal, 14-Bit Voltage-Output DAC

with Parallel Interface

________________________________________________________________ Maxim Integrated Products

1

DUTGNDGH

OUTH

REFGH-

REFGH+

CLR

DB13

DB12

DB11

DB10

DB9

DB8

DUTGNDAB

OUTA

REFAB-

REFAB+

LDAC

A2

A1

A0

CS

1

2

3

4

5

6

7

8

9

10

11

33

32

31

30

29

28

27

26

25

24

23

MQFP

MX7841

TOP VIEW

19-2953; Rev 0; 7/03

PART

MX7841BS

MX7841AS

-40°C to +85°C

-40°C to +85°C

TEMP RANGE

PIN-

PACKAGE

44 MQFP

44 MQFP

Functional Diagram appears at end of data sheet.

Pin Configuration

Ordering Information

INL

(LSB)

±2

±4