The AD5204/AD5206 provides four-/six-channel, 256 position digitally-controlled Variable Resistor (VR) devices. These devices 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 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.
|
|
|
Mechanical Potentiometer ReplacementInstrumentation: Gain, Offset AdjustmentProgrammable Voltage-to-Current ConversionProgrammable Filters, Delays, Time ConstantsLine Impedance Matching
|
256 PositionMultiple Independently Programmable Channels AD5204-4-Channel AD5206-6-ChannelPotentiometer Replacement10 kV, 50 kV, 100 kV3-Wire SPI-Compatible Serial Data Input+2.7 V to +5.5 V Single Supply; 62.7 V Dual Supply OperationPower ON Midscale Preset
|
ABSOLUTE MAXIMUM RATINGS*
(TA = +25°C, unless otherwise noted)
VDD to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.3 V, +7 V
VSS to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 V, 7 V
VDD to VSS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +7 V
VA, VB, VW to GND . . . . . . . . . . . . . . . . . . . . . . . . . . VSS, VDD
AxBx, AxWx, BxWx . . . . . . . . . . . . . . . . . . . . . . ±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
Post a Buying Lead
Required Field 
