WM2623

Low Power 8-bit Serial Input DAC

Production Data, October 2000, Rev 1.0

WOLFSON MICROELECTRONICS LTD

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

Tel: +44 (0) 131 667 9386

Fax: +44 (0) 131 667 5176

Email: sales@wolfson.co.uk

http://www.wolfson.co.uk

Production Data Datasheets contain final

specifications current on publication date.

Supply of products conforms to Wolfson

Microelectronics’ Terms and Conditions.

2000 Wolfson Microelectronics Ltd

.

FEATURES

• 8-bit voltage output DAC

• Single supply from 2.7V to 5.5V

• Very low power consumption (3V supply):

-

900

µW, slow mode

-

2.1mW, fast mode

-

3

µW, standby mode

• DNL ±0.2 LSB, INL ±0.5 LSB (max)

• Monotonic over Temperature

• DSP compatible serial interface

• Programmable settling time of 3µs or 9µs typical

• High impedance reference input buffer

APPLICATIONS

•

Digital Servo Control Loops

•

Industrial Process Control

•

Battery powered instruments and controls

•

Machine and motion control devices

•

Digital offset and gain adjustment

ORDERING INFORMATION

DEVICE

TEMP. RANGE

PACKAGE

WM2623CD

0° to 70°C

8-pin SOIC

WM2623ID

-40° to 85°C

8-pin SOIC

DESCRIPTION

The WM2623 is an 8-bit voltage output, resistor string digital-to-

analogue converter. It can operate with supply voltages

between 2.7V and 5.5V and can be powered down under

software control. Power down reduces current consumption to

less than 1

µA.

The device has been designed for glueless interface to industry

standard microprocessors and DSPs, including the TMS320

family. The WM2623 is programmed with a 16-bit serial word

including 4 control bits and 8 data bits.

Excellent performance is delivered with a typical DNL of

0.2LSBs. Monotonicity is

guaranteed over the operating

temperature

range.

The

settling

time

of

the

DAC

is

programmable to allow for optimisation of speed versus power

dissipation. The output stage is buffered by a rail-to-rail amplifier

with a gain of two, which features a Class AB output stage.

The reference voltage input features a high impedance buffer

which eliminates the need to keep the reference source

impedance low.

The WM2623 is

available in an

8-pin

SOIC

package.

Commercial (0

° to 70°C) and Industrial (-40° to 85°C)

temperature range variants are available.

BLOCK DIAGRAM

TYPICAL PERFORMANCE

(7) OUT

8-BIT

DAC

LATCH

REF(6)

POWER-ON

RESET

DIN (1)

SCLK (2)

FS (4)

(5)

GND

VDD

(8)

POWERDOWN/

SPEED

CONTROL

2-BIT

CONTROL

LATCH

REFERENCE

INPUT BUFFER

WM2623

16-BIT

SHIFT

REGISTER

AND

CONTROL

LOGIC

data

X1

X2

DAC

OUTPUT

BUFFER

CSB (3)

-0.1

-0.08

-0.06

-0.04

-0.02

0

0.02

0.04

0.06

0.08

0.1

0

32

64

96

128

160

192

224

256

DIGITAL CODE