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Precision CMOS op amps pose alternative to JFETs

Posted: 07 Jan 2003 ?? ?Print Version ?Bookmark and Share

Keywords:advanced linear devices? ald2724e? ald2724? cmos operational amplifier? op amp?

Advanced Linear Devices Inc. calls its ALD2724E/ALD2724 dual precision CMOS operational amplifiers as more-feature-rich alternatives to JFET input op amps. The devices are high-slew rate, high-precision versions of the company's ALD1704 ofering.

The ALD2724E permits user-programmable offset-voltage trimming using the Epad (electrically programmable analog device) technology. The ALD2724, which is preprogrammed at the factory, is intended for standard op amp applications where little or no electrical programming by the user is necessary.

The op amps are said to be suited for apps in portable instruments, sensor pre-amps, transducer biasing, and precision gain circuits where mechanical potentiometer trimming is not a viable alternative.

Standard offset-voltage specs for the ALD2724E and ALD2724 are typically 25 V at 0.01pA input bias current. The ALD2724E has a guaranteed input offset programming range of 5mV and is recommended for applications requiring electrical user programming for further Vos trimming using an ALD E100 Epad programming unit and adapter module.

Both devices feature rail-to-rail input and output voltage ranges, tolerance to overvoltage input of 300mV beyond supply rails, 5V supply operation, input currents of 0.01pA typical, high open-loop voltage gain, 2.1MHz bandwidth, a slew rate of 5V/s, and a supply current of 5mA.

In 1,000-piece quantities, the ALD2724E and ALD2724 are priced respectively at $1.83 and $1.46. Delivery is from stock. Package options are 14-pin PDIPs, SOICs and ceramic DIPs. The devices are also available as standard cells for analog/digital ASIC arrays.

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