SLOSE75B February 2022 – March 2023 TAS2780
PRODUCTION DATA
The device supports post-filter feedback by closing the amplifier feedback loop after the external filter. The feedback is applied using the VSNS_N and VSNS_P terminals of the device. This feature can be disabled using the PFFB_EN register bit, for instance if an external filter that violates the amplifier loop stability is implemented. When PFFB is disabled, the feedback will be internally routed from the OUT_N and OUT_P pins of the device.
In the PFFB mode of operation the following conditions have to be met by the external filter: f0 > 10 MHz and f0/Q > 2.5 MHz (f0 and Q are the cutoff frequency and the quality factor of the external filter).