Dual Channel, Low Power, 16-Bit, Serial Input

DIGITAL-TO-ANALOG CONVERTER

APPLICATIONS

q PORTABLE INSTRUMENTATION

q CLOSED-LOOP SERVO-CONTROL

q PROCESS CONTROL

q DATA ACQUISITION SYSTEMS

q PROGRAMMABLE ATTENUATION

q PC PERIPHERALS

DESCRIPTION

The DAC8532 is a dual channel, 16-bit Digital-to-Analog

Converter (DAC) offering low power operation and a flexible

serial host interface. Each on-chip precision output amplifier

allows rail-to-rail output swing to be achieved over the supply

range of 2.7V to 5.5V. The device supports a standard 3-wire

serial interface capable of operating with input data clock

The DAC8532 requires an external reference voltage to set

the output range of each DAC channel. Also incorporated

into the device is a power-on reset circuit which ensures that

the DAC outputs power up at zero-scale and remain there

until a valid write takes place. The DAC8532 provides a

flexible power-down feature, accessed over the serial inter-

face, that reduces the current consumption of the device to

200nA at 5V.

The low-power consumption of this device in normal opera-

tion makes it ideally suited to portable battery-operated

equipment and other low-power applications. The power

consumption is 2.5mW at 5V, reducing to 1

µW in power-

down mode.

The DAC8532 is available in a MSOP-8 package with a

specified operating temperature range of –40

°C to +105°C.

FEATURES

q microPOWER OPERATION: 500

q POWER-ON RESET TO ZERO-SCALE

q POWER SUPPLY: +2.7V to +5.5V

q 16-BIT MONOTONIC OVER TEMPERATURE

q SETTLING TIME: 10

q ULTRA-LOW AC CROSSTALK: –100dB typ

q LOW-POWER SERIAL INTERFACE WITH

SCHMITT-TRIGGERED INPUTS

q ON-CHIP OUTPUT BUFFER AMPLIFIER WITH

RAIL-TO-RAIL OPERATION

q DOUBLE BUFFERED INPUT ARCHITECTURE

q SIMULTANEOUS OR SEQUENTIAL OUTPUT

UPDATE AND POWERDOWN

q TINY MSOP-8 PACKAGE

DAC8532

SBAS246A – DECEMBER 2001 – MAY 2003

www.ti.com

Copyright © 2001-2003, Texas Instruments Incorporated

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

Control Logic

Channel

Select

Load

Control

8

Data

Buffer B

DAC

Register B

16

DAC B

Power-Down

Control Logic

24-Bit

Serial-to-

Parallel

Shift

Register

Resistor

Network

V

DD

GND

V

V

Data

Buffer A

DAC

Register A

DAC A

V

REF

SYNC

2

SCLK

D

IN