AD8403ARUZ10

Overview

The AD8403ARUZ10 is a quad-channel, 256-position digital potentiometer in a 24-lead TSSOP package. It operates on a single 2.7 V to 5.5 V supply with less than 5 μA shutdown current. The device features a 3-wire SPI-compatible interface with a 10 MHz update rate and includes an SDO pin for daisy-chaining. Each channel provides linear resistance adjustment with a nominal 10 kΩ total end-to-end value, ±1% channel matching, and a 500 ppm/°C temperature coefficient. It supports hardware reset to midscale and maintains settings during power-down.

Feature Summary

• Quad-channel architecture with independent 8-bit (256-tap) variable resistors
• SPI-compatible serial interface supporting daisy-chain operation via SDO
• Hardware reset (RS) forces wipers to midscale; SHDN reduces current to <5 μA
• Extended industrial temperature range from -40°C to +125°C

Applications

• Mechanical potentiometer replacement in space-constrained designs
• Programmable filters, delays, and time constant adjustments
• Line impedance matching and power supply voltage trimming

Procurement Notes

Verify the specific suffix 'RUZ' confirms the 24-lead TSSOP surface-mount package and 10 kΩ resistance value. Confirm RoHS compliance status as automotive qualification may vary by manufacturing site. Check for obsolescence notices or lifecycle changes before finalizing procurement plans.

Selection Notes

Select this component when four independent digital potentiometers are required in a compact footprint. Ensure the 10 kΩ nominal resistance aligns with the target circuit's impedance requirements. Verify that the 2.7 V minimum supply voltage meets the system's logic levels and that the 10 MHz clock speed is supported by the host microcontroller.

Part Context

This part belongs to the AD8400/AD8402/AD8403 family of digitally controlled variable resistors. While the AD8400 offers one channel and the AD8402 offers two, the AD8403 integrates four channels. The '10' suffix denotes the 10 kΩ resistor value, and 'RUZ' indicates the thin TSSOP-24 package suitable for PCMCIA and portable applications.

Replacement Considerations

Direct pin-compatible replacements within the same family include other AD8403 variants with different resistance values (e.g., AD8403ARZ1, AD8403ARZ50). For dual-channel needs, the AD8402 series may be considered if fewer channels suffice.