WM2625

Low Power Dual 8-bit Serial Input DAC

Production Data, April 2001, 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

www.wolfsonmicro.com

Production Data Datasheets contain final

specifications current on publication date.

Supply of products conforms to Wolfson

Microelectronics’ Terms and conditions.

2001 Wolfson Microelectronics Ltd

.

FEATURES

• Dual 8-bit voltage output DAC

• Single supply from 2.7V to 5.5V

• Low supply current

-

0.8mA typical in slow mode

-

1.8mA typical in fast mode

• DNL ±0.2 LSB, INL ±0.5 LSB (max)

• Monotonic over temperature

• DSP compatible serial interface

• Programmable settling time of 1µs or 3µs 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

WM2625CD

0° to 70°C

8-pin SOIC

WM2625ID

-40° to 85°C

8-pin SOIC

DESCRIPTION

The WM2625 is a dual 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 1

µA.

The device has been designed for glueless interface to industry

standard

microprocessors

and

DSPs.

The

WM2625

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 analogue output is buffered by a rail-to-rail

amplifier with a gain of two and 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 WM2625 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

WM2625

SERIAL

INTERFACE

AND

CONTROL

LOGIC

POWER-

DOWN AND

SPEED

CONTROL

X1

X1

X2

X2

REF

DIN

SCLK

NCS

OUTA

OUTB

8

8

2

VDD

GND

DAC

DAC

-0.1

-0.08

-0.06

-0.04

-0.02

0

0.02

0.04

0.06

0.08

0.1

0

326496

128

160

192

224

256

DIGITAL CODE