AD7376AN50 AD [Analog Devices], AD7376AN50 Datasheet

AD7376AN50

Manufacturer Part Number

AD7376AN50

Description

+-15 V Operation Digital Potentiometer

Manufacturer

AD [Analog Devices]

Datasheet

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GENERAL DESCRIPTION

The AD7376 provides a single channel, 128-position digitally-

controlled variable resistor (VR) device. This device performs the

same electronic adjustment function as a potentiometer or vari-

able resistor. These products were optimized for instrument and

test equipment applications where a combination of high voltage

with a choice between bandwidth or power dissipation are avail-

able as a result of the wide selection of end-to-end terminal resis-

tance values. The AD7376 contains a fixed resistor with a wiper

contact that taps the fixed resistor value at a point determined by

a digital code loaded into the SPI-compatible serial-input regis-

ter. The resistance between the wiper and either endpoint of the

fixed resistor varies linearly with respect to the digital code trans-

ferred into the VR latch. The variable resistor offers a completely

programmable value of resistance between the A terminal and the

wiper or the B terminal and the wiper. The fixed A to B terminal

resistance of 10 k , 50 k , 100 k or 1 M has a nominal tem-

perature coefficient of –300 ppm/ C.

The VR has its own VR latch which holds its programmed resis-

tance value. The VR latch is updated from an internal serial-to-

parallel shift register which is loaded from a standard 3-wire

serial-input digital interface. Seven data bits make up the data

word clocked into the serial data input register (SDI). Only the

last seven bits of the data word loaded are transferred into the

7-bit VR latch when the CS strobe is returned to logic high. A

serial data output pin (SDO) at the opposite end of the serial

without additional external decoding logic.

The reset (RS) pin forces the wiper to the midscale position by

loading 40

*Patent Number: 5495245

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

128 Position

Potentiometer Replacement

10 k , 50 k , 100 k , 1 M

Power Shutdown: Less than 1 A

3-Wire SPI Compatible Serial Data Input

+5 V to +30 V Single Supply Operation

Midscale Preset

APPLICATIONS

Mechanical Potentiometer Replacement

Instrumentation: Gain, Offset Adjustment

Programmable Voltage-to-Current Conversion

Programmable Filters, Delays, Time Constants

Line Impedance Matching

Power Supply Adjustment

5 V to

into the VR latch. The SHDN pin forces the resistor

15 V Dual Supply Operation

to an end-to-end open circuit condition on the A terminal and

shorts the wiper to the B terminal, achieving a microwatt power

shutdown state. When shutdown is returned to logic high, the

previous latch settings put the wiper in the same resistance

setting prior to shutdown as long as power to V

moved. The digital interface is still active in shutdown so that

code changes can be made that will produce a new wiper posi-

tion when the device is taken out of shutdown.

The AD7376 is available in both surface mount (SOL-16) and

the 14-lead plastic DIP package. For ultracompact solutions

selected models are available in the thin TSSOP package. All

parts are guaranteed to operate over the extended industrial

temperature range of –40 C to +85 C. For operation at lower

supply voltages (+3 V to +5 V), see the AD8400/AD8402/

AD8403 products.

The last seven data bits clocked into the serial input register will

be transferred to the VR 7-bit latch when CS returns to logic

high. Extra data bits are ignored.

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

Tel: 781/329-4700

Fax: 781/326-8703

(DATA OUT)

(DATA IN)

OUT

SDO

CLK

SDI

CLK

SDO

SDI

CSH0

FUNCTIONAL BLOCK DIAGRAM

Figure 1. Detail Timing Diagram

AD7376

CSS

GND

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

Digital Potentiometer

SERIAL

7-BIT

LATCH

7-BIT

15 V Operation

1 LSB ERROR BAND

CSH

AD7376*

SHDN

PD_MAX

CS1

is not re-

CSW

1 LSB

Related parts for AD7376AN50

AD7376AN50 Summary of contents

Page 1

FEATURES 128 Position Potentiometer Replacement 100 Power Shutdown: Less than 1 A 3-Wire SPI Compatible Serial Data Input + +30 V Single Supply Operation ...

AD7376–SPECIFICATIONS ELECTRICAL CHARACTERISTICS Parameter DC CHARACTERISTICS RHEOSTAT MODE (Specifications Apply to All VRs) 2 Resistor Differential NL 2 Resistor Nonlinearity Nominal Resistor Tolerance Resistance Temperature Coefficient Wiper Resistance Wiper Resistance DC CHARACTERISTICS POTENTIOMETER DIVIDER MODE (Specifications Apply to All VRs) ...

Page 3

... Storage Temperature . . . . . . . . . . . . . . . . . . – +150 C Lead Temperature (Soldering, 10 sec +300 C Package Power Dissipation . . . . . . . . . . . . (T Thermal Resistance JA P-DIP (N-14 C/W SOIC (SOL-16 120 C/W TSSOP- 240 C/W Model AD7376AN10 AD7376AR10 AD7376ARU10 AD7376AN50 AD7376AR50 AD7376ARU50 AD7376AN100 AD7376AR100 AD7376ARU100 AD7376AN1M AD7376AR1M AD7376ARU1M Die Size: 101.6 mil 127.6 mil, 2.58 mm 3.24 mm Number Transistors: 840 CAUTION ESD (electrostatic discharge) sensitive device ...

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AD7376AN50 AD [Analog Devices], AD7376AN50 Datasheet

AD7376AN50

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