AD7398BRU-REEL7 View Datasheet(PDF) - Analog Devices

Part Name

Description

Manufacturer

AD7398BRU-REEL7

Quad, Serial-Input 12-Bit/10-Bit DACs

Analog Devices 

FEATURES

AD7398—12-bit resolution

AD7399—10-bit resolution

Programmable power shutdown

Single (3 V to 5 V) or dual (±5 V) supply operation

3-wire, serial SPI®-compatible interface

Internal power-on reset

Double buffered registers for simultaneous

multichannel DAC update

Four separate rail-to-rail reference inputs

Thin profile, TSSOP-16 package available

Low tempco: 1.5 ppm/°C

Qualified for automotive applications

APPLICATIONS

Automotive output voltage span

Portable communications

Digitally controlled calibration

PC peripherals

GENERAL DESCRIPTION

The AD7398/AD7399 family of quad, 12-bit/10-bit, voltage

output digital-to-analog converters (DACs) is designed to

operate from a single 3 V to 5 V supply or a dual ±5 V supply.

Built with the Analog Devices, Inc. robust CBCMOS process,

these monolithic DACs offer the user low cost with ease-of-use

in single or dual-supply systems.

The applied external reference, VREF, determines the full-scale

output voltage. Valid VREF values include VSS < VREF < VDD that

result in a wide selection of full-scale outputs. For multiplying

applications, ac inputs can be as large as ±5 VP.

A doubled-buffered serial-data interface offers high speed, 3-wire,

SPI- and microcontroller-compatible inputs using serial data-in

(SDI), clock (CLK), and a chip-select (CS). A common level-

sensitive, load-DAC strobe (LDAC) input allows simultaneous

update of all DAC outputs from previously loaded input registers.

Additionally, an internal power-on reset forces the output voltage to

zero at system turn on. An external asynchronous reset (RS) also

forces all registers to the zero code state. A programmable power-

shutdown feature reduces power dissipation on unused DACs.

Rev. C

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other

rights of third parties that may result from its use. Specifications subject to change without notice. No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarks and registered trademarks are the property of their respective owners.

Quad, Serial-Input

12-Bit/10-Bit DACs

AD7398/AD7399

FUNCTIONAL BLOCK DIAGRAM

VDD

VREFB VREFA

AD7398/AD7399

SERIAL

REGISTER

CS

SDI

CLK

INPUT

REG A

DAC A

REGISTER

INPUT

REG B

DAC B

REGISTER

INPUT

REG C

DAC C

REGISTER

DAC A

DAC B

DAC C

VOUTA

VOUTB

VOUTC

12/10

POWER

ON RESET

INPUT

REG D

DAC D

REGISTER

DAC D

VOUTD

VSS

RS

LDAC VREFC VREFD

Figure 1.

GND

Both parts are offered in the same pinout, enabling users to

select the appropriate resolution for their application without

redesigning the layout. For 8-bit resolution applications, see the

pin-compatible AD7304 product.

The AD7398/AD7399 are specified over the extended industrial

(−40°C to +125°C) temperature range. Parts are available in

16-lead, wide body SOIC and ultracompact, thin, 1.1 mm

TSSOP packages.

0.5

VDD = +5V

0.4

VSS = –5V

VREF = +2.5V

0.3

TA = 25°C

0.2

0.1

0

–0.1

–0.2

–0.3

–0.4

–0.5

0

512 1024 1536 2048 2560 3072 3584 4096

CODE (Decimal)

Figure 2. AD7398 DNL vs. Code (TA = 25°C)

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

www.analog.com

Fax: 781.461.3113 ©2000–2011 Analog Devices, Inc. All rights reserved.

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