AD8403A10 Analog Devices, AD8403A10 Datasheet

AD8403A10

Manufacturer Part Number

AD8403A10

Description

Manufacturer

Analog Devices

Datasheet

1.AD8403A10.pdf (20 pages)

Specifications of AD8403A10

Case

SOP24

97+

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GENERAL DESCRIPTION

The AD8400/AD8402/AD8403 provide a single, dual or quad

channel, 256 position digitally controlled variable resistor (VR) device.

These devices perform the same electronic adjustment function as

a potentiometer or variable resistor. The AD8400 contains a single

variable resistor in the compact SO-8 package. The AD8402 contains

two independent variable resistors in space-saving SO-14 surface-

mount packages. The AD8403 contains four independent variable

resistors in 24-lead PDIP, SOIC, and TSSOP packages. Each part

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

controlling serial input register. The resistance between the wiper and

either endpoint of the fixed resistor varies linearly with respect to the

digital code transferred into the VR latch. Each 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 1 kΩ, 10 kΩ, 50 kΩ, or 100 kΩ has a ±1%

channel-to-channel matching tolerance with a nominal temperature

coefficient of 500 ppm/°C. A unique switching circuit minimizes the

high glitch inherent in traditional switched resistor designs avoiding

any make-before-break or break-before-make operation.

Each VR has its own VR latch that holds its programmed resistance

value. These VR latches are updated from an SPI compatible serial-

to-parallel shift register that is loaded from a standard 3-wire

serial-input digital interface. Ten data bits make up the data word

clocked into the serial input register. The data word is decoded where

the first two bits determine the address of the VR latch to be loaded,

the last eight bits are data. A serial data output pin at the opposite end

of the serial register allows simple daisy-chaining in multiple VR

applications without additional external decoding logic.

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

loading 80

into the VR latch. The SHDN pin forces the resistor

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 SHDN is returned to logic high, the

previous latch settings put the wiper in the same resistance

setting prior to shutdown. The digital interface is still active in

shutdown so that code changes can be made that will produce

new wiper positions when the device is taken out of shutdown.

The AD8400 is available in both the SO-8 surface-mount and the

8-lead plastic DIP package.

The AD8402 is available in both surface mount (SO-14) and

14-lead plastic DIP packages, while the AD8403 is available in a

narrow body 24-lead plastic DIP and a 24-lead surface-mount

package. The AD8402/AD8403 are also offered in the 1.1 mm thin

TSSOP-14/TSSOP-24 packages for PCMCIA applications. All

parts are guaranteed to operate over the extended industrial tem-

perature range of –40°C to +125°C.

DGND

CLK

SDI

100

AD8400/AD8402/AD8403

AD8403

FUNCTIONAL BLOCK DIAGRAM

Digital Potentiometers

SELECT

A1, A0

CK Q RS

SERIAL

LATCH

10-BIT

DAC

SDO

CODE – Decimal

1-/2-/4-Channel

128

LATCH

CK RS

LATCH

CK RS

LATCH

CK RS

8-BIT

192

RDAC1

RDAC2

RDAC3

RDAC4

SHDN

AGND1

AGND2

AGND3

AGND4

255

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