Quad CMOS op-amp for low-voltage signal chains
The TLR344F-GE2 is a quad CMOS operational amplifier from ROHM's TLR series, packing four independent amplifiers into a single 14-SOIC package. Each amplifier delivers a 2.3 MHz gain-bandwidth product with a 1.2 V/µs slew rate, enough bandwidth for audio-frequency conditioning, motor-current sensing, or multi-channel data acquisition front-ends. The rail-to-rail output stage swings within millivolts of both supply rails, preserving dynamic range when the headroom is tight.
The 1 pA typical input bias current means the amplifier loads high-impedance sources — photodiode transimpedance stages, pH probes, or piezoelectric sensors — by less than the self-discharge of a good capacitor. You can use 10 MΩ feedback resistors without the bias current creating a DC offset that swamps the signal. With 300 µA supply current per amplifier, the quad package draws 1.2 mA total — low enough that a 500 mAh coin cell runs the signal chain for over 400 hours continuous. The 300 µV input offset voltage sets the DC accuracy floor; for a gain-of-100 stage the output offset is 30 mV, which is acceptable for 8-10 bit systems but needs trimming for 12-bit precision.