AD5142BRUZ10

Overview

The AD5142BRUZ10 is a dual-channel, nonvolatile digital potentiometer featuring 256 tap positions controlled via an SPI-compatible interface. It offers a nominal resistance of 10 kΩ with a maximum tolerance of ±8% and a temperature coefficient of 35 ppm/°C. The device supports single or dual supply operation (VDD: 2.3 V to 5.5 V; VSS: 0 V to -2.75 V) with an independent logic supply ranging from 1.8 V to 5.5 V. Key electrical characteristics include a wiper current of ±6 mA, a bandwidth of 3 MHz at 10 kΩ, and a fast start-up time under 75 µs. It is housed in a 16-lead TSSOP package.

Feature Summary

• Dual-channel architecture with 256-position resolution and nonvolatile EEPROM storage for power-on restoration.
• SPI-compatible serial interface allowing read/write access to RDAC registers and memory contents.
• Linear gain setting mode enables independent programming of string resistors for accurate matching.
• Wide operating temperature range from −40°C to +125°C.

Applications

• Portable electronics level adjustment
• LCD panel brightness and contrast controls
• Programmable filters, delays, and time constants
• Programmable power supplies

Procurement Notes

Verify the specific suffix 'BRUZ10' against the manufacturer's ordering guide to confirm the 10 kΩ resistance value and TSSOP packaging. Ensure compatibility with the required SPI clock speeds and voltage levels for the logic supply (VLOGIC). Check for automotive qualification requirements if applicable, as the family includes AEC-Q100 qualified variants.

Selection Notes

Select this model over the AD5122 variant when 256 tap positions are required instead of 128. Confirm that the 10 kΩ resistance value suits the application's current density limits (±6 mA max). Verify that the SPI interface timing parameters align with the host controller's capabilities. Consider the INDEP pin functionality if linear gain setting mode is needed at power-up.

Part Context

This component belongs to the AD5122/AD5142 family of dual-channel digital potentiometers. The AD5142 series specifically provides 256 positions, whereas the AD5122 offers 128 positions. Both share similar electrical characteristics but differ in resolution. The BRUZ10 designation indicates the B grade (±8% tolerance), UZ package (TSSOP), and 10 kΩ resistance value.

Replacement Considerations

The AD5122BRUZ10 serves as a parameter-equivalent alternative with identical electrical specifications but reduced resolution (128 taps instead of 256). Other family members like the AD5142A offer I2C interfaces instead of SPI. Verify pinout compatibility and software command set differences when substituting.

FAQ

What is the function of the INDEP pin?

The INDEP pin enables the Linear Gain Setting Mode at power-up. When active, each string resistor is loaded independently from its associated memory location. This setting cannot be disabled by software once enabled.

How does the device handle data retention?

The device features nonvolatile EEPROM memory that retains the wiper position settings after power loss. Data retention is guaranteed for 50 years at an endurance of 1k cycles, or 5 years at 100k cycles.

What is the maximum continuous current allowed through the terminals?

For the 10 kΩ version (AD5142BRUZ10), the maximum continuous current through terminals A, B, and W is ±6 mA. For the 100 kΩ version, it is limited to ±1.5 mA.