AD8403

PRODUCTION

4-Channel Digital Potentiometer

Data Sheet (Rev. E) Product Selection Table
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Overview

  • 256-Position
  • Replaces 1,2 or 4 Potentiometers
  • 1 kΩ, 10 kΩ, 50 kΩ, 100 kΩ Available Options
  • Power Shutdown - Less than 5 µA
  • 3-Wire SPI-Compatible Serial Data Input
  • 10 MHz Update Data Loading Rate
  • 2.7 V to 5.5 V Single-Supply Operation
  • Midscale Preset

The AD8400 / AD8402 / AD8403 provide a single, dual or quad channel, 256 position digitally controlled variable resistor (VR) device. These devices perform the same electronic adjustment function as a potentiometer or variable resistor. The AD8400 contains a single variable resistor in the compact SO-8 package. The AD8402 contains two independent variable resistors in saving SO-14 surface mount package. The AD8403 contains four independent variable resistors in 24-lead PDIP, SOIC and TSSOP packages. Each part 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 controlling 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. Each 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 1 kΩ, 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 avoiding any make-before-break or break-before-make operation.

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.
AD8403
4-Channel Digital Potentiometer
AD8403 Functional Block Diagram AD8403 Pin Configuration
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Documentation

Data Sheet 1

User Guide 1

Application Note 4

Technical Articles 1

Frequently Asked Question 1

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Software Resources

FPGA/HDL 2

Evaluation Kits

eval board
schematic 1
EVAL-AD8403

AD8403 Evaluation Board

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Features and Benefits

  • Full-featured evaluation board for the AD8403
  • Various test circuits
  • Various ac/dc input signals
  • PC control via a separately purchased system demonstration platform (SDP)
  • PC software for control

Product Details

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.
EVAL-AD8403
AD8403 Evaluation Board
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