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Octal, 13-Bit Voltage-Output DAC

with Parallel Interface

________________________________________________________________

Maxim Integrated Products

1

44

1

2

3

440

41

42

43

5

21

24

26

25

27 28

22 23

19 20

8

9

10

11

12

13

14

15

16

17

29

30

31

32

33

34

35

36

37

38

A1

VOUTH

REFGH

AGNDGH

GND

LDGH

LDEF

D0

D1

D2

A2

WR

CS

LDCD

LDAB

AGNDAB

REFAB

VOUTA

7

39

VOUTG

VOUTB

6

18

MAX547

PLCC

TOP VIEW

VOUTH

VDD

REFGH

AGNDGH

GND

D0

D1

D2

VOUTG

LDEF

LDGH

VOUTA

VDD

REFAB

AGNDAB

LDAB

WR

A2

A1

VOUTB

CS

LDCD

PLASTIC FP

23

24

25

26

27

28

29

30

31

32

33

11

10

9

8

7

6

5

4

3

2

1

MAX547

19-0257; Rev 3; 12/95

_________________General Description

The MAX547 contains eight 13-bit, voltage-output digital-to-

analog converters (DACs). On-chip precision output ampli-

fiers provide the voltage outputs. The MAX547 operates

from a ±5V supply. Bipolar output voltages with up to ±4.5V

voltage swing can be achieved with no external compo-

nents. The MAX547 has four separate reference inputs;

each is connected to two DACs, providing different full-

scale output voltages for every DAC pair.

The MAX547 features double-buffered interface logic with a

13-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 (

–

L

—

D

—

_

–

) input transfers data from the

input latch to the DAC latch. The four

–

L

—

D

—

_

–

inputs each control

two DACs, and all DAC latches can be updated simultane-

ously by asserting all

–

L

—

D

—

_

–

pins. An asynchronous clear (

–

C

—

L

—

R

–

)

input resets the output of all eight DACs to AGND_. Asserting

–

C

—

L

—

R

–

resets both the DAC and the input latch to bipolar zero

(1000hex). On power-up, reset circuitry performs the same

function as

–

C

—

L

—

R

–

. All logic inputs are TTL/CMOS compatible.

The MAX547 is available in 44-pin plastic quad flat pack

and 44-pin PLCC packages.

________________________Applications

Automatic Test Equipment

Minimum Component-Count Analog Systems

Digital Offset/Gain Adjustment

Arbitrary Function Generators

Industrial Process Controls

Avionics Equipment

_____________________________Features

o Full 13-Bit Performance without Adjustments

o 8 DACs in One Package

o Buffered Voltage Outputs

o Calibrated Linearity

o Guaranteed Monotonic to 13 Bits

o ±5V Supply Operation

o Unipolar or Bipolar Outputs Swing to ±4.5V

o Double-Buffered Digital Inputs

o Asynchronous Load Inputs Load Pairs of DAC Latches

o Asynchronous

–

C

—

L

—

R

–

Input Resets DACs to Analog

Ground

o Power-On Reset Circuit Resets DACs to Analog Ground

o Microprocessor and TTL/CMOS Compatible

________________Ordering Information

Ordering Information continued at end of data sheet.

*Contact factory for dice specifications.

MAX547ACQH

MAX547BCQH

MAX547ACMH

0°C to +70°C

0°C to +70°C

0°C to +70°C

44 PLCC

44 PLCC

44 Plastic FP

MAX547BCMH

0°C to +70°C

44 Plastic FP

MAX547BC/D

0°C to +70°C

Dice*

_______________________________________________________________Pin Configurations

±2

±4

±2

±4

±4

PART

TEMP. RANGE

PIN-PACKAGE

INL

(LSBs)