AD644 Datasheet | Analog Devices

a Features Matched Offset Voltage Matched Offset Voltage Over Temperature Matched Bias Currents Crosstalk - 124 d B at 1 k Hz Low Bias Current: 35 p A 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 m A max Fast Settling to ؎0.01%: 3 ␮ s Low Total Harmonic Distortion: 0.0015% at 1 k Hz 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 Bi FET 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 Bi FET operational amplifiers: 35 p A max, matched to 25 p A for the AD644K and L, 75 p A max matched to 35 p A for the AD644J and S. In addition, the offset voltage is laser trimmed to less than 0.5 m V, and matched to 0.25 m V for the AD644L, 1.0 m V and matched to 0.5 m V 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-implanted JFETs and laser-wafer trimming. Ion-implantation permits the fabrication of precision, matched JFETs on a monolithic bipolar chip. This process optimizes the ability to produce matched amplifiers which have lower initial bias currents than other popular Bi FET op amps. Laser-wafer trimming each amplifier’s input offset voltage assures tight initial match and superior IC processing guarantees offset voltage tracking over the temperature range. The AD644 is remended for applications...