ad7394an Analog Devices, Inc., ad7394an Datasheet

ad7394an

Manufacturer Part Number

ad7394an

Description

+3 V, Dual, Serial Input 12-/10-bit Dacs

Manufacturer

Analog Devices, Inc.

Datasheet

1.AD7394AN.pdf (12 pages)

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GENERAL DESCRIPTION

The AD7394/AD7395 family of dual, 12-/10-bit, voltage output

digital-to-analog converters is designed to operate from a single

+3 V supply. Built using a CBCMOS process, this monolithic

DAC offers the user low cost and ease of use in single-supply

+3 V systems. Operation is guaranteed over the supply voltage

range of +2.7 V to +5.5 V making this device ideal for battery

operated applications.

The full-scale output voltage is determined by the applied exter-

nal reference input voltage, VREF. The rail-to-rail VREF input

to V

positive supply V

A doubled-buffered serial data interface offers high speed,

microcontroller compatible inputs using serial-data-in (SDI),

clock (CLK) and load strobe (LDA + LDB) pins. A chip-select

(CS) pin simplifies connection of multiple DAC packages by

enabling the clock input when active low. Additionally, an RS

input sets the output to zero scale or to 1/2 scale based on the

logic level applied to the MSB pin. The power shutdown pin,

SHDN, reduces power dissipation to nanoamp current levels.

All digital inputs contain Schmitt-triggered logic levels to mini-

mize power dissipation and prevent false triggering on the clock

input.

Both parts are offered in the same pinout to allow users to select

the amount of resolution appropriate for their application with-

out circuit card redesign.

REV. 0

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

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

FEATURES

Micropower: 100 A/DAC

0.1 A Typical Power Shutdown

Single-Supply +2.7 V to +5.5 V Operation

Compact 1.1 mm Height TSSOP-14 Package

AD7394/12-Bit Resolution

AD7395/10-Bit Resolution

Serial Interface with Schmitt Trigger Inputs

APPLICATIONS

Automotive Output Span Voltage

Portable Communications

Digitally Controlled Calibration

PC Peripherals

OUT

outputs allows for a full-scale voltage set equal to the

or any value in between.

The AD7394/AD7395 is specified over the extended industrial

(–40 C to +85 C) temperature range. Packages available in-

clude plastic DIP and low profile 1.75 mm height SO-14 surface

mount packages. The AD7395ARU is available for ultracompact

applications in a thin 1.1 mm TSSOP-14 package. For automotive

applications the AD7395AR is specified for operation over the

(–40 C to +125 C) temperature range.

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

Tel: 781/329-4700

Fax: 781/326-8703

(DATA)

CLK

LDA

LDB

SDI

Figure 1. Differential Nonlinearity Error vs. Code

–0.2

–0.4

–0.6

–0.8

0.8

0.6

0.4

0.2

–1

SUPERIMPOSED

FUNCTIONAL BLOCK DIAGRAM

DGND

= –55 C, +25 C, +85 C

500

REF

+3 V, Dual, Serial Input

= 3V

= 2.5V

World Wide Web Site: http://www.analog.com

1000

MSB

P R

1500

AD7394/AD7395

CODE – Decimal

12-/10-Bit DACs

2000

REF

AD7394/AD7395

2500

DAC A

DAC B

3000

AGND

3500

AMP A

AMP B

SHDN

4000

OUTA

OUTB

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