Now stocked by Mouser Electronics, the THS4567 from Texas Instruments is a novel fully differential amplifier (FDA) that includes both independent input common-mode (VICM) and output common-mode (VOCM) control, while standard FDAs possess only the latter. The THS4567 is a decompensated amplifier with a minimum stable gain of 10 V/V. It operates as a fully differential transimpedance amplifier (TIA) and analog-to-digital converter (ADC) driver in a single integrated stage.
The VICM loop decouples the reverse bias across the photodiode (PD) from the amplifier’s input and output swing compliance ranges, thereby allowing the designer to maximise the PD reverse bias and minimise the PD capacitance. The VICM loop can be disabled, which then allows the THS4567 to operate as a standard FDA. The VOCM loop sets the differential output common-mode voltage and is typically set at the subsequent ADC stage common-mode reference voltage.
Applications for the THS4567 include absolute optical encoders, AC drive position feedback, linear motor position sensors, clinical pulse oximeters and optical coherence tomography.
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