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256-tap digital potentiometer features I²C interface, integrated EEPROM

Phoenix, Ariz.—ON Semiconductor has added to its family of Digitally Programmable Potentiometers (DPP) a 256-tap, single-channel linear-taper device with 50 kΩ and 100 kΩ end-to-end resistance.

The CAT5140 digital potentiometer is a low-noise, reliable and space-saving alternative to DACs and mechanical potentiometers. 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 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 (2 micro-amperes max) of the CAT5140, combined with integrated memory make it well-suited for mechanical potentiometer replacement in space-constrained, handheld applications. Since it is digitally programmable, the CAT5140 is insensitive to mechanical vibrations, shock and oxidation.

The CAT5140 is a single-channel, linear-taper digital potentiometer with a 400 kilohertz (kHz), I²C-compatible interface for LCD screen adjustment; automated calibration; contrast, brightness and volume control; gain adjustment and line impedance matching applications. EEPROM endurance for the CAT5140 is 2,000,000 data write stores, two times that of competitive devices. Data retention is 100 years, which is two times higher than competitive digital potentiometers.

The CAT5140 digitally programmable potentiometer comes in a Pb-free, RoHS-compliant 8-lead MSOP package.

Pricing: $0.60 USD per unit in 10,000 unit quantities.
Availability: Samples are available now. Projected lead-time for production quantities is currently eight to 12 weeks ARO.
Datasheet: click here.

ON Semiconductor, www.onsemi.com

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