AD5207

Features:

256-Position, 2-Channel
Potentiometer Replacement
10 k
, 50 k
, 100 k

Power Shut-Down, Less than 5 A
2.7 V to 5.5 V Single Supply
2.7 V Dual Supply
3-Wire SPI-Compatible Serial Data Input
Midscale Preset During Power-On




Application

Mechanical Potentiometer Replacement
Stereo Channel Audio Level Control
Instrumentation: Gain, Offset Adjustment
Programmable Voltage-to-Current Conversion
Programmable Filters, Delays, Time Constants
Line Impedance Matching
Automotive Electronics Adjustment




Pinout








Specifications



ABSOLUTE MAXIMUM RATINGS1
(TA = 25°C, unless otherwise noted)
VDD to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.3, +7 V
VSS to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0, 3 V
VDD to VSS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
VA, VB, VW to GND . . . . . . . . . . . . . . . . . . . . . . . . . . VSS, VDD
IMAX²(A, B, W) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±20 mA
Digital Inputs and Output Voltage to GND . . 0 V, VDD + 0.3 V
Operating Temperature Range . . . . . . . . . .40°C to +125°C
Maximum Junction Temperature (TJ Max) . . . . . . . . . . 150°C
Storage Temperature . . . . . . . . . . . . . . . . . .65°C to +150°C
Lead Temperature (Soldering, 10 sec) . . . . . . . . . . . . . 300°C
Thermal Resistance³_JA, TSSOP-14 . . . . . . . . . . . . . 206°C/W




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 nominal 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 AD5207 is available in 1.1 mm thin TSSOP-14 package, which is suitable for PCMCIA applications. All parts are guaranteed to operate over the extended industrial temperature range of 40°C to +125°C.