WM2626

Low Power Dual 8-bit Serial Input DAC

with Internal Reference

Production Data, Rev. 1.0, April 2001

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 power consumption:

-

1.7mW typical (3V supply, slow mode)

-

3.7mW typical (3V supply, fast mode)

• DNL ±0.1 LSB, INL ±0.4 LSB (typical)

• Monotonic over temperature

• Microprocessor and DSP compatible serial interface

• Programmable settling time of 0.8µs or 2.8µs 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

WM2626CD

0° to 70°C

8-pin SOIC

WM2626ID

-40° to 85°C

8-pin SOIC

DESCRIPTION

The WM2626 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. It 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 on-chip voltage reference is available to external circuitry

through the REF pin. It is buffered and can supply up to 1mA.

Alternatively, an external reference can be used. A high

impedance reference input buffer eliminates the need to keep

the reference source impedance low.

The WM2626 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

WM2626

SERIAL

INTERFACE

AND

CONTROL

LOGIC

POWER-

DOWN AND

SPEED

CONTROL

X1

X1

X2

X2

REF

DIN

SCLK

NCS

OUTA

OUTB

8

8

2

DAC

DAC

x1/x2

1.024V

REF

2

GND

VDD

-0.04

-0.03

-0.02

-0.01

0

0.01

0.02

0.03

0.04

0

32

64

96

128

160

192

224

256

DIGITAL CODE