Single-Channel Digital Potentiometer
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.
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
The AD8403 supports a single-supply 2.7 V to 5.5 V operation, making the device suited for battery-powered applications and many other applications, offering a ±1% channel-to-channel matching tolerance.
In addition, the AD8403 uses a versatile SPI serial interface, allowing speeds of up to 50 MHz.
The EVAL-AD8403SDZ can operate in single-supply mode and incorporates an internal power supply from the USB.
Complete specifications for the AD8403 part can be found in the AD8403 data sheet.
Product Selection Guide
Choosing the Correct digiPOT for Your Application
Digital Potentiometers Vary Amplitude In DDS Devices
(Electronic Design, 5/29/2000)
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