AD5206

Features:

256 Position
Multiple Independently Programmable Channels
AD5204-4-Channel
AD5206-6-Channel
Potentiometer Replacement
10 kV, 50 kV, 100 kV
3-Wire SPI-Compatible Serial Data Input
+2.7 V to +5.5 V Single Supply; 62.7 V Dual Supply
Operation
Power ON Midscale Preset




Application

Mechanical Potentiometer Replacement
Instrumentation: Gain, Offset Adjustment
Programmable Voltage-to-Current Conversion
Programmable Filters, Delays, Time Constants
Line Impedance Matching




Pinout








Specifications

ABSOLUTE MAXIMUM RATINGS*
(TA = +25°C, unless otherwise noted)
V_DD to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.3 V, +7 V
V_SS to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 V, 7 V
V_DD to V_SS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +7 V
V_A, V_B, V_W to GND . . . . . . . . . . . . . . . . . . . . . . . . . . VSS, VDD
A_xB_x, A_xW_x, B_xW_x . . . . . . . . . . . . . . . . . . . . . . ±20 mA
Digital Input and Output Voltage to GND . . . . . . . 0 V, +7 V
Operating Temperature Range . . . . . . . . . . 40°C to +85°C
Maximum Junction Temperature (TJ MAX) . . . . . . . . +150°C
Storage Temperature . . . . . . . . . . . . . . . . .65°C to +150°C
Lead Temperature (Soldering, 10 sec) . . . . . . . . . . . .+300°C
Package Power Dissipation . . . . . . . . . . . . . (TJ maxTA)/JA
Thermal Resistance _JA
P-DIP (N-24) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63°C/W
SOIC (SOL-24) . . . . . . . . . . . . . . . . . . . . . . . . . . . 70°C/W
TSSOP-24 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143°C/W






Description

The AD5204/AD5206 provides four-/six-channel, 256 position digitally-controlled Variable Resistor (VR) devices. These devices AD5204/AD5206 perform the same electronic adjustment function as a potentiometer or variable resistor. Each channel of the AD5204/ AD5206 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 endpoint 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 nominal tempera- ture coefficient of 700 ppm/°C.

Each VR has its own VR latch which holds its programmed resistance value. These VR latches AD5204/AD5206 are updated from an internal serial-to-parallel shift register that is loaded from a standard 3-wire serial-input digital interface. Eleven data bits make up the data word clocked into the serial input register. The first
three bits are decoded to determine which VR latch will be loaded with the last eight bits of the data word when the CS strobe is returned to logic high. A serial data output pin at the opposite end of the serial register (AD5204 only) allows simple daisy-chaining in multiple VR applications without additional external decoding logic.