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WM2626ID

Low Power Dual 8-bit Serial Input DAC with Internal Reference

Wolfson Microelectronics plc 

WM2626

Low Power Dual 8-bit Serial Input DAC

with Internal Reference

Production Data, Rev. 1.0, April 2001

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

WM2626ID

0° to 70°C

-40° to 85°C

BLOCK DIAGRAM

8-pin SOIC

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 1µA.

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.

TYPICAL PERFORMANCE

DIN

SCLK

NCS

x1/x2

1.024V

REF

2

REF

X1

VDD GND

X1

WM2626

8

DAC

X2

SERIAL

INTERFACE

AND

CONTROL

LOGIC

8

DAC

X2

POWER-

2

DOWN AND

SPEED

CONTROL

OUTA

OUTB

0.04

0.03

VDD = 5V, Slow Mode, VREF = 2.048V external

0.02

0.01

0

-0.01

-0.02

-0.03

-0.04

0

32

64

96

128

160

192

224

256

DIGITAL CODE

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.

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