WM2637 查看數據表（PDF） - Wolfson Microelectronics plc

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WM2637

Dual 10-Bit Serial Input Voltage Output DAC with Internal Reference

Wolfson Microelectronics plc 

WM2637

Dual 10-Bit Serial Input Voltage Output DAC

with Internal Reference

Production Data, Rev 1.0, July 1999

FEATURES

• Dual 10-bit voltage output DAC

• Single 2.7V to 5.5V supply

• DNL ±0.1 LSBs, INL ±0.4 LSBs

• Internal programmable voltage reference

• Low power consumption:

• 5.5 mW, slow mode - 5V supply

• 3.3 mW, slow mode - 3V supply

• TMS320, (Q) SPITM, and MicrowireTM compatible serial

interface

• Programmable settling time of 1µs or 3.5µs typical

• 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

DESCRIPTION

The WM2637 is a dual 10-bit voltage output, resistor string, digital-

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

provided that reduces current consumption to 10nA.

The WM2637 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 WM2637 is programmed with a 16-bit serial word

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

control data.

Excellent performance is delivered with a typical DNL of 0.1 LSBs.

The programmable settling time allows the designer to optimize

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° to 70°C) and

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

ORDERING INFORMATION

DEVICE

WM2637CD

WM2637ID

TEMP. RANGE

0° to 70°C

-40° to 85°C

PACKAGE

8-pin SOIC

8-pin SOIC

BLOCK DIAGRAM

REF(6)

REFERENCE

OUTPUT BUFFER

WITH OUPUT

ENABLE

X1

1.024V/2.048V

SELECTABLE

REFERENCE

VDD

(8)

c

TYPICAL PERFORMANCE

0.2

5V = VDD, VREF = External, Speed = Slow mode, Load = 10k/100pF

0.15

0.1

DIN (1)

SCLK (2)

NCS (3)

16-BIT

SHIFT

REGISTER

AND

CONTROL

LOGIC

POWER-ON

RESET

(5)

AGND

2-BIT

REFERENCE

SELECT

LATCH

10-BIT

DAC A

LATCH

10-BIT

DAC B

HOLDING

LATCH

REFERENCE

INPUT

BUFFER

X1

REFERENCE

INPUT BUFFER

X1

10-BIT

DAC B

LATCH

DAC

OUTPUT

BUFFER

X2

(4) OUTA

DAC

OUTPUT

BUFFER

X2

(7) OUTB

2-BIT

CONTROL

LATCH

POWERDOWN/

SPEED

CONTROL

WM2637

0.05

0

-0.05

-0.1

-0.15

-0.2

0

256

512

767

DIGITAL CODE

1023

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 15:56

©1999 Wolfson Microelectronics Ltd.

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