AD644

a FEATURES Matched Offset Voltage Matched Offset Voltage Over Temperature Matched Bias Currents Crosstalk –124 dB at 1 kHz Low Bias Current: 35 pA max Warmed Up Low Offset Voltage: 500 ␮V max Low Input Voltage Noise: 2 ␮ V p-p High Slew Rate: 13 V/␮s Low Quiescent Current: 4.5 mA max Fast Settling to ؎0.01%: 3 ␮ s Low Total Harmonic Distortion: 0.0015% at 1 kHz Standard Dual Amplifier Pinout Available in Hermetic Metal Can Package and Chip Form MIL-STD-883B Processing Available Single Version Available: AD544 PRODUCT DESCRIPTION Dual High Speed, Implanted BiFET Op Amp AD644 PIN CONFIGURATION +V AMPLIFIER NO. 1 8 OUTPUT 1 2 3 TOP VIEW 4 5 7 6 OUTPUT AMPLIFIER NO. 2 INVERTING INPUT NONINVERTING INPUT INVERTING INPUT NONINVERTING INPUT –V NOTE: PIN 4 CONNECTED TO CASE The AD644 is a pair of matched high speed monolithic FET input operational amplifiers fabricated with the most advanced bipolar, JFET and laser-trimming technologies. The AD644 offers matched bias currents that are significantly lower than currently available monolithic dual BiFET operational amplifiers: 35 pA max, matched to 25 pA for the AD644K and L, 75 pA max matched to 35 pA for the AD644J and S. In addition, the offset voltage is laser trimmed to less than 0.5 mV, and matched to 0.25 mV for the AD644L, 1.0 mV and matched to 0.5 mV for the AD644K, utilizing Analog Devices’ laser-wafer trimming (LWT) process. The tight matching and temperature tracking between the operational amplifiers is achieved by ion-...