AD5242 AD [Analog Devices], AD5242 Datasheet

AD5242

Manufacturer Part Number

AD5242

Description

2-Channel, 256-Position Digital Potentiometer

Manufacturer

AD [Analog Devices]

Datasheet

1.AD5242.pdf (16 pages)

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Download datasheet (661Kb)

GENERAL DESCRIPTION

The AD5207 provides dual channel, 256-position, digitally

controlled variable resistor (VR) devices that perform the same

electronic adjustment function as a potentiometer or variable

resistor. Each channel of the AD5207 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 register. The resistance between the wiper and either

end point of the fixed resistor varies linearly with respect to the

digital code transferred 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 kΩ, 50 kΩ or 100 kΩ

has a ± 1% channel-to-channel matching tolerance with a nomi-

nal temperature coefficient of 500 ppm/°C. A unique switching

circuit minimizes the high glitch inherent in traditional switched

resistor designs and avoids any make-before-break or break-

before-make operation.

Each VR has its own VR latch, which holds its programmed

resistance value. These VR latches are updated from an internal

serial-to-parallel shift register, which is loaded from a standard

3-wire serial-input digital interface. Ten bits, to make up the

data word, are required and clocked into the serial input register.

The first two bits are address bits. The following eight bits are

the data bits that represent the 256 steps of the resistance value.

The reason for two address bits instead of one is to be compatible

with similar products such as AD8402 so that drop-in replacement

is possible. The address bit determines the corresponding VR

latch to be loaded with the data bits during the returned positive

edge of CS strobe. 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.

An internal reset block will force the wiper to the midscale posi-

tion during every power-up condition. The SHDN pin forces an

open circuit on the A Terminal and at the same time 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 remains active during shutdown;

code changes can be made to produce new wiper positions when

the device is resumed from shutdown.

The AD5207 is available in 1.1 mm thin TSSOP-14 package,

which is suitable for PCMCIA applications. All parts are guaran-

teed to operate over the extended industrial temperature range

of –40°C to +125°C.

DGND

SHDN

CLK

SDI

FUNCTIONAL BLOCK DIAGRAM

2-Channel, 256-Position

LOGIC

RDAC1 REGISTER

Digital Potentiometer

SERIAL INPUT REGISTER

AD5207

RDAC2 REGISTER

AD5207

POWER-

RESET

SDO

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