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Digitally controlled pots come in tiny package

Posted: 04 Mar 2008 ?? ?Print Version ?Bookmark and Share

Keywords:digital pots? TQFN package? potentiometers?

Intersil Corp. has announced the ISL23511 and ISL23512 low-noise, low-power, single push-button digitally controlled potentiometers (DCPs) in small 2mm x 1.6mm micro-TQFN packages.

In addition to an easy push-button interface, these DCPs feature a two-mode automatic increment/decrement function that allows the customer to hold the pin low until the designated position is reached. The initial hold will increment or decrement every 250ms, and then enter the second mode after one second. At that point, the wiper position will change every 50ms.

Both devices feature a rugged 125C operating temperature rating that allows them to be designed into high-temperature environments.

They integrate a shutdown mode that disconnects the top of the resistor chain and moves the wiper to the lowest position, minimizing power consumption. The purpose of the shutdown is to completely disconnect the current path thru the DCP but still keep the digital logic active. In addition it can serve as a quick calibration when GND level needs to be verified.

The ISL23512 is a 16-tap device that is suitable for applications that require only a limited amount of adjustment settings. The ISL23511, on the other hand, features 32 taps for designs needing higher resolution for more adjustment options.

Before July 2008, Intersil will also release the ISL22511 and ISL22512 non-volatile versions of these products in the same tiny TQFN packages. This will further expand the DCP offerings for applications that need to retain the last setting at power-up.

The ISL23511 and ISL23512 are available in a 10-lead micro-TQFN package in 1,000-unit quantities and are priced at 50 cents and 39 cents, respectively. The ISL23511 is also available in an 8-lead SOIC package and is priced at 49 cents per unit in 1,000-unit quantities.

Intersil is one of the exhibitors at the 13th IIC-China 2008.

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