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WM2633

Byte-wide Parallel Input, 12-bit Voltage Output DAC with Internal Reference

Wolfson Microelectronics plc 

WM2633

Byte-wide Parallel Input, 12-bit Voltage Output DAC

with Internal Reference

Production Data, July 1999, Rev 1.0

FEATURES

• 12-bit voltage output DAC

• Dual supply 2.7V to 5.5V operation

• DNL ±0.3 LSBs, INL ±1.2 LSBs

• Internal programmable voltage reference

• Programmable settling time

• 8-bit micro controller compatible interface

• Power down mode (10nA)

APPLICATIONS

• Battery powered test instruments

• Digital offset and gain adjustment

• Battery operated/remote industrial controls

• Machine and motion control devices

• Wireless telephone and communication systems

• Speech synthesis

• Arbitrary waveform generation

ORDERING INFORMATION

DEVICE

WM2633CDT

WM2633IDT

TEMP. RANGE

0° to 70°C

-40° to 85°C

PACKAGE

20-pin TSSOP

20-pin TSSOP

BLOCK DIAGRAM

DESCRIPTION

The WM2633 is a 12-bit voltage output, resistor string, digital-

to-analogue converter. A hardware controlled power down mode

is provided that reduces current consumption to 10nA. The

WM2633 features an internal programmable voltage reference

simplifying overall system design. A reference voltage may also

be supplied externally.

The device has an 8-bit microcontroller compatible parallel

interface. The eight data LSBs, the four data MSBs, and the five

control bits are written using three different addresses.

Excellent performance is delivered with a typical DNL of 0.3

LSBs and a typical INL of 1.2 LSBs. The output stage is

buffered by a x2 gain near rail-to-rail amplifier, which features a

Class A output stage (slow mode, Class AB). The settling time

of the DAC is software or pin programmable to allow the

designer to optimise speed versus power dissipation.

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.

TYPICAL PERFORMANCE

REF(12)

REFERENCE

OUTPUT BUFFER

WITH OUPUT

ENABLE

X1

1.024V/2.048V

SELECTABLE

REFERENCE

DVDD

(10)

AVDD

(11)

2-BIT

REFERENCE

SELECT

LATCH

SPD (9)

NPD (15)

A[0-1] (8, 7)

NCS (18)

NWE (17)

PARALLEL

INTERFACE

AND

CONTROL

LOGIC

D[0-7]

(19,20, 1-6)

POWER-ON

RESET

POWERDOWN/

SPEED

CONTROL

3-BIT

CONTROL

LATCH

4-BIT DAC

MSW

HOLDING

LATCH

8-BIT DAC

LSW

HOLDING

LATCH

REFERENCE

INPUT BUFFER

X1

12-BIT DAC

LATCH

DAC

OUTPUT

BUFFER

X2

(13) OUT

(14)

GND

(16)

NLDAC

WM2633

1

AVDD = DVDD 5V, VREF = External. 2.048V, Speed = Fast mode, Load = 10k/100pF

0.8

0.6

0.4

0.2

0

-0.2

-0.4

-0.6

-0.8

-1

0

512

1024

1536

2048

2559

3071

DIGITAL CODE

3583

4095

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 contain final specifications

current on publication date. Supply of

products conforms to Wolfson

Microelectronics’ Terms and conditions.

masterrev1.0.doc 07/15/99 3:52

1999 Wolfson Microelectronics Ltd.

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