Lutton Court, Bernard Terrace, Edinburgh EH8 9NX, UK

Tel: +44 (0) 131 667 9386

Fax: +44 (0) 131 667 5176

email: admin@wolfson.co.uk

www: http://www.wolfson.co.uk

Description

WM5620L and WM5620 are quad 8-bit digital to analogue

converters (DAC) controlled via a serial interface. Each

DAC's output voltage range isprogrammable for either x1

or x 2 its reference input voltage, allowing near rail to rail

operation for the x 2 output range. Separate high

impedance buffered voltage reference inputs are provided

for each DAC. WM5620L operates on a single supply

voltage of 3 V while WM5620 operates on 5 V.

WM5620/L interfaces to all popular microcontrollers and

microprocessors via a three wire serial interface with CMOS

compatible, schmitt trigger, digital inputs. An 11 bit

command word comprises 2 DAC select bits, an output

range selection bit and 8-bits of data.

Individual or all DAC outputs are changed using WM5620/

L's double buffered DAC registers and the separate LOAD

and LDAC inputs. DAC outputs

are updated

simultaneously by writing a complete set of new values

and then pulsing the LDAC input.

The DAC outputs are optimised for single supply

operation and driving ground referenced loads.

An internal power-on-reset function sets the DAC's input

codes to zero at power up.

Ideal in space critical applications WM5620/L is available

•

Four 8-bit voltage output DAC's

•

Three wire serial interface

•

Programmable x1 or x 2 output range.

•

Power-on-reset sets outputs to zero

•

Buffered voltage reference inputs

•

Simultaneous DAC output update

•

14 pin SO or DIP package

Key Specifications

•

Single supply operation:

WM5620L

: 3 V

WM5620

: 5 V

•

0 to 4 V output (x 2 output range) at 5 V VDD

•

0 to 2.5 V output (x 2 output range) at 3 V VDD

•

Low power: 5.1 mW at 3 V, 10 mW at 5 V max.

•

Guaranteed monotonic output

Applications

•

Programmable d.c. voltage sources

•

Digitally controlled attenuator/amplifier

•

Signal synthesis

•

Mobile communications

•

Automatic test equipment

•

Process control

3 & 5V Quad 8-Bit Voltage Output DAC

with Serial Interface

Features

Wolfson Microelectronics

Production Data

Sept. 1996 Rev 2

© 1996 Wolfson Microelectronics

WM5620L, WM5620

Production Data data sheets contain

final specifications current on publication

date. Supply of products conforms to

Wolfson Microelectronics standard terms

and conditions

DAC

DAC

DAC

DAC

Latch

Latch

Latch

Latch

Latch

Latch

Latch

Latch

x 2

x 2

x 2

x 2

Serial Interface

Power-on-Reset

9

9

9

9

8

8

8

8

Ref A

2

3

4

Ref B

Ref C

5

Ref D

Clk

Data

Load

7

6

8

DACA

12

11

DACB

10

DACC

DACD

9

14

13

LDAC

GND

1

Block Diagram