WM2614

Quad 12-bit Serial Input Voltage Output DAC

Production Data, June 1999, 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

http://www.wolfson.co.uk

Production Data Datasheets contain final

specifications current on publication date.

Supply of products conforms to Wolfson

Microelectronics’ terms and conditions.

2614Mastera.doc June 18, 1999 14:36

©1999 Wolfson Microelectronics Ltd

.

FEATURES

•

Quad 12-bit DAC voltage output DAC

•

Dual 2.7V to 5.5V supply (separate digital and analogue

supplies)

•

DNL

±±0.4 LSB, INL ±±1.5 LSB

•

Low power consumption:

-

5.5mW, slow mode

−− 5V supply

-

3.3mW, slow mode

−− 3V supply

•

TMS320, (Q)SPI

™

™, and Microwire™

™ compatible serial

interface

•

Programmable settling time of 4

µµs or 12µµs typical

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

TEMP. RANGE

PACKAGE

WM2614CDT

0° to 70°C

16-pin TSSOP

WM2614IDT

-40° to 85 °C

16-pin TSSOP

DESCRIPTION

The WM2614 is a quadruple 12-bit voltage output, resistor string,

digital-to-analogue converter. Each DAC can be individually

powered down under software control. A hardware controlled mode

is provided that powers down all DACs. Power down reduces

current consumption to 10nA.

The device has been designed to interface efficiently to industry

standard microprocessors and DSPs, including the TMS320

family. The WM2614 is programmed with a 16-bit serial word

comprising of a DAC address, individual DAC control bits and a

12-bit value.

The WM2614 has provision for two supplies: one supply for the

serial interface (DVDD, DGND) and one for the DACs, reference

buffers and output buffers (AVDD, AGND). This enables a typical

application

where

the

device

can

be

controlled

via

a

microprocessor operating on a 3V supply, with the DACs operating

on a 5V supply. Alternatively, the supplies can be tied together in a

single supply application.

Excellent performance is delivered with a typical DNL of 0.4 LSBs.

The settling time of the DAC is programmable to allow the designer

to optimize speed versus power dissipation. The output stage is

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

Class AB output stage. DACs A and B can have a different

reference voltage to DACs C and D.

The device is available in a 16-pin TSSOP package.

Commercial

temperature

(0

° to 70°C) and Industrial

temperature (-40

° to 85°C) variants are supported.

BLOCK DIAGRAM

TYPICAL PERFORMANCE

(11) OUTD

(12) OUTC

(13) OUTB

(14) OUTA

14-BIT

DATA AND

CONTROL

HOLDING

LATCH

12-BIT

DAC

LATCH

16-BIT

SHIFT

REGISTER

AND

CONTROL

LOGIC

REFINAB (15)

POWER-ON

RESET

DIN (4)

FS (7)

SCLK (5)

NCS (6)

(9)

AGND

(8)

DGND

(3)

NLDAC

(2)

NPD

AVDD

(16)

DVDD

(1)

X2

DAC A

DAC C

DAC D

POWERDOWN/

SPEED

CONTROL

WM2614

2-BIT

CONTROL

LATCH

REFINCD (10)

DAC B

X1

DAC

OUTPUT

BUFFER

data

REFERENCE

INPUT BUFFER

AVDD = DVDD = 5V, V

-1

-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

3583

4095

DIGITAL CODE