256-tap digital potentiometer

11 November 2009 Electronics Technology

ON Semiconductor added a 256-tap, single-channel linear-taper device to its family of digitally programmable potentiometers (DPP). The CAT5140 is a low-noise alternative to DACs and mechanical potentiometers, and it features an on-chip, 8-bit, non-volatile EEPROM memory, which allows designers to calibrate once and retain the wiper setting in memory on power-up. The new DPP also provides five additional non-volatile registers for general-purpose data storage, as well as a volatile wiper register for applications requiring temporary storage.

The integrated memory options in the CAT5140 save board space and costs compared to DAC-based design approaches, which typically require external memory and additional interconnects. Additionally, the ultra-low standby current of 2 μA, combined with integrated memory, make it well suited for mechanical potentiometer replacement in space-constrained, handheld applications. Since it is digitally programmable, the device is insensitive to mechanical vibrations, shock and oxidation, making it more stable and reliable than mechanical potentiometers across most environmental conditions.

The CAT5140 is a single-channel, linear-taper digital potentiometer with a 400 kHz, I²C-compatible interface for LCD screen adjustment; automated calibration; contrast, brightness and volume control; gain adjustment and line impedance matching applications. EEPROM endurance is 2 million data write stores and data retention is 100 years. The device operates from a 2,5 to 5,5 V supply voltage and comes in resistance values of 50 and 100 k.

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