JFET op amps suit use in professional-audio applications

摘要

Texas Instruments' Burr-Brown Division recently released the single OPA1641, dual OPA1642, and quad OPA1644 operational amplifiers, which feature a JFET input stage. The parts operate with ±2.25 to ±18V power supplies, and output distortion is 0.00005% at 1 kHz. The devices feature a ±20-pA maximum bias current at 25℃ and a 70-pA typicalrnbias current at 85℃. The 11-MHz-band-width IC has less than 3.5-mV maximum offset voltage. It consumes 1.8 mA quiescent current per channel and achieves a 20V/usec slew rate. The amp is unity-gain stable and has an open-loop gain of 105 dB. The rail-to-rail output has a 2-kΩ load.