National Semiconductor LMP8100A: Programmable-gain amplifier features 0.03% gain accuracy across industrial-temperature range

Delivering 0.03% gain accuracy, the LMP8100A precision programmable-gain amplifier uses a software-adjustable gain in 1V/V increments from 1 to 16V/V over the –40 to +125°C industrial-temperature range. An array of 16 precision thin-film resistors sets the amplifier’s closed-loop gain. At the core of the device, a precision 33-MHz CMOS-input, rail-to-rail-I/O operation amplifier provides a 110-dB typical open-loop gain. Providing four levels of internal frequency compensation, the higher gain settings increase the usable signal bandwidth. The input-zero-calibration feature allows the user to measure the output offset voltage to calibrate any errors resulting from temperature or voltage shifts. Users program control modes with a serial port, allowing cascading of several devices. Additional features include a 12V/µsec slew rate, 33-MHz unity-gain bandwidth, 2.7 to 5.5V supply-voltage range, 5.3-mA supply current, 20-µA output current, and 20-mA power consumption in shutdown mode. The amplifier also uses the vendor’s VIP50 BiCMOS process technology. Available in an SOIC-14 package, the LMP8100A amplifier costs $7 (1000).

National Semiconductor, www.national.com