WM2608

Octal 10-bit, Serial Input, Voltage Output DAC

with Power Down

Production Data, April 2001, Rev 1.0

WOLFSON MICROELECTRONICS LTD

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

• Eight 10-bit DACs in one package

• Dual supply 2.7V to 5.5V operation

• DNL ±0.1 LSBs, INL ±0.5 LSBs typical

• Programmable settling time / power

(1.0

µs typical in fast mode)

• Microcontroller compatible serial interface

• Power down mode ( < 0.1µA)

• Monotonic over temperature

• Data output for daisy chaining

APPLICATIONS

• Battery powered test instruments

• Digital offset and gain adjustment

• Battery operated / remote industrial controls

• Programmable loop controllers

• CNC machine tools

• Machine and motion control devices

• Wireless telephone and communication systems

• Robotics

ORDERING INFORMATION

DEVICE

TEMP. RANGE

PACKAGE

WM2608CDT

0

° to 70°C

20-pin TSSOP

WM2608IDT

-40

° to 85°C

20-pin TSSOP

DESCRIPTION

The WM2608 is an octal, 10-bit, resistor string digital-to-

analogue converter. The eight individual DACs contained in the

IC can be switched in pairs between fast and slow (low power)

operation modes, or powered down, under software control.

Alternatively, the whole device can be powered down, reducing

current consumption to less than 0.1

µA.

The DAC outputs are buffered by a rail-to-rail amplifier with a

gain of two, which is configurable as Class A (fast mode) or

Class AB (for low-power mode).

The WM2608 has been designed to interface directly to industry

standard microprocessors and DSPs, and can operate on two

separate analogue and digital power supplies. It is programmed

with a 16-bit serial word comprising 4 address bits and up to 12

DAC or control register data bits. All eight DACs can be

simultaneously forced to a preset value using a preset input pin.

A daisy-chain data output makes it possible to control several of

Wolfson’s octal DACs from the same interface, without

increasing the number of control lines.

The

device

is

available

in

a

20-pin

TSSOP

package.

Commercial

temperature

(0°

to

70°C)

and

Industrial

temperature (-40° to 85°C) variants are supported.

BLOCK DIAGRAM

TYPICAL PERFORMANCE

LATCH

POWER/SPEED

CONTROL

RESISTOR

STRING

(12) OUT A

DAC A

DIN (2)

SCLK (3)

FS (4)

PREB (5)

DOUT (19)

DACs B, C, D, E, F, G, H

as DAC A

(6-9, 13-15)

OUT B to H

VREF/2

SERIAL

INTERFACE

AND

CONTROL

LOGIC

MODE (17)

AVDD

(11)

DVDD

(20)

AGND

(10)

DGND

(1)

LOADB

(18)

REF

(16)

-0.2

-0.15

-0.1

-0.05

0

0.05

0.1

0.15

0.2

0

128

256

384

512

640

768

896

1024

DIGITAL CODE