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Op amp has offset calibration to 200 µV

Microchip Technology’s new MCP651/2/5 operational amplifier targets use in microphone preamplifi ers, optical-detector circuitry, digital scales, industrial instrumentation, H-bridge drivers, bar-code scanners, transmission-line drivers, and medical equipment for patientmonitoring and ultrasound functions.

The device has a maximum supply voltage of 5.5V and a minimum supply voltage of 2.5V. Input-noise voltage density is 7nV/√Hz with a flickernoise corner of 30 kHz. The device has a 50-MHz-gainbandwidth product and can output 95 mA of current. The op amp has rail-to-rail outputs and an input structure that allows input-common-mode voltages 300 mV below the negative-supply voltage. It requires 1.3V of common-mode headroom below the positivesupply voltage. The outputslew rate is 30V/µsec, and the supply current is 6 mA. The typical input-bias current is 6 pA, and the maximum is 5000 pA at 125°C.

The device comes in a 10-pin DFN package with an extra pin for the calibration function. When you pull the pin low, the part enters a calibration routine using an onboard DAC, plus memory and delay counters. The pin initiates an offsetvoltage correction within 200 msec. Another version ships in a standard eight-pinpackage pinout without calibration pins, so it performs the correction only on poweron and within 4 msec.

The device features a 40 to +125°C operating- temperature range. Samples are available now, and the vendor is accepting volume orders. The singleamp MCP651, dual eight-pin MCP652, and dual 10-pin MCP655 cost $1.21, $1.49, and $1.58 (10,000), respectively.

Microchip Technology, www.microchip.com.