WM2638ID Datasheet

IC型號：
WM2638ID
PDF描述：
Dual 12-Bit Serial Input Voltage Output DAC with Internal re...
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WOLFSON

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WM2638

Dual 12-Bit Serial Input Voltage Output DAC

with Internal reference

Production Data, Rev 1.0, July 1999

FEATURES

鈥?/div>

Two 12-bit voltage output DACs

Single 2.7V to 5.5V supply operation

DNL

鹵

0.4 LSBs, INL

鹵

2 LSBs

Low power consumption

鈥?/div>

12mW typical in fast mode

鈥?/div>

6mW typical in slow mode

TMS320, (Q)SPI鈩?, and Microwire鈩?compatible

鈩?/div>

serial interface

Programmable settling time 1碌 s or 3.5碌 s typical

碌

Power down mode 10nA

DESCRIPTION

The WM2638 is a dual 12-bit voltage output, resistor string, digital-

to-analogue converter. A software controlled power down mode is

provided that reduces current consumption to 10nA.

The WM2638 features an internal programmable voltage reference

simplifying overall system design. A reference voltage may also be

supplied externally.

The device has been designed to interface efficiently to industry

standard microprocessors and DSPs, including the TMS320

family. The WM2638 is programmed with a 16-bit serial word

comprising of a latch address, mode control bits and DAC or

control data.

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

The programmable settling time allows the designer to optimise

speed versus power consumption. The output stage is buffered by

a x2 gain near rail-to-rail amplifier.

The device is available in an 8-pin SOIC package ideal for space-

critical applications. Commercial temperature (0擄 to 70擄C) and

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

鈥?/div>

APPLICATIONS

鈥?/div>

Battery powered test instruments

Digital offset and gain adjustment

Battery operated/remote industrial controls

Machine and motion control devices

Cellular telephones

Wireless telephones and communication systems

Speech synthesis

Arbitrary waveform generation

ORDERING INFORMATION

DEVICE

WM2638CD

WM2638ID

TEMP. RANGE

0擄 to 70擄C

-40擄 to 85擄C

PACKAGE

8-pin SOIC

BLOCK DIAGRAM

VDD

(8)

TYPICAL PERFORMANCE

5V = VDD, V

REF

= External, Speed = Fast mode, Load = 10k/100pF

0.8

REFERENCE

OUTPUT BUFFER

WITH OUPUT

ENABLE

REF(6)

1.024V/2.048V

SELECTABLE

REFERENCE

0.6

0.4

2-BIT

REFERENCE

SELECT

LATCH

DAC

OUTPUT

BUFFER

(4) OUTA

DNL- LSB

(7) OUTB

REFERENCE

INPUT

BUFFER

0.2

DIN (1)

16-BIT

SHIFT

AND

CONTROL

LOGIC

12-BIT

DAC A

LATCH

-0.2

REFERENCE

INPUT BUFFER

SCLK (2)

-0.4

DAC

OUTPUT

BUFFER

NCS (3)

-0.6

12-BIT

DAC B

HOLDING

LATCH

12-BIT

DAC B

LATCH

-0.8

-1

2-BIT

CONTROL

LATCH

POWERDOWN/

SPEED

CONTROL

512

1024

1536

2048

DIGITAL CODE

2559

3071

3583

4095

POWER-ON

RESET

WM2638

(5)

AGND

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

contains final specifications

current on publication date. Supply of products

conforms to Wolfson Microelectronics' Terms

and Conditions.

Last printed 15/07/99 15:58

漏1999

Wolfson Microelectronics Ltd

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