Microchip Technology’s new MCP651/2/5 operational amplifier targets use in microphone preamplifiers, optical-detector circuitry, digital scales, industrial instrumentation, H-bridge drivers, bar-code scanners, transmission-line drivers, and medical equipment for patient monitoring and ultrasound functions. The device has a maximum supply voltage of 5.5V and a minimum supply voltage of 2.5V. The device has a 50MHz-gain-bandwidth product and can output 95mA of current. The op amp has rail-to-rail outputs and an in input structure that allows input-common-mode voltages 300mV below the negative-supply voltage. It requires 1.3V of common-mode head room below the positive-supply voltage. The output-slew rate is 30V/μsec, and the supply current is 6mA. The typical input-bias current is 6pA, 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 calibration routine using an onboard DAC and memory and delay counters. The pin initiates an offset-voltage correction within 200 msec. Another version comes in a standard eight-pin-package pinout without calibration pins, so it performs the correction only on power-on and within 4 msec. The device has an operating-temperature range of −40°C to +125°C. Samples are available now, and the vendor is accepting volume orders. The single-amp MCP651, dual eight-pin MCP652, and dual 10-pin MCP655 cost $1.21, $1.49, and $1.58 (10,000), respectively.
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Figure 1: Microchip offers a demonstration board to allow you to evaluate the offset-voltage-calibration capabilities of the MCP652 op amp.
Figure 2: The MCP65x offset-calibrating op amp series is available in single-eight pin (a), dual eight-pin (b), and dual 10-pin versions (c).
