ZHCSHK8B October 2017 – October 2018 TAS2770
The TAS2770 Class-D amplifier supports spread spectrum PWM modulation, which can be enabled by setting the AMP_SS register bit high. This can help reduce EMI in some systems.
By default the Class-D amplifier's switching frequency is based on the device's trimmed internal oscillator. To synchronize switching to the audio sample rate, set the CLASSD_SYNC register bit high. When the Class-D is synchronized to the audio sample rate, the RATE_RAMP register bit must be set based whether the audio sample rate is based on a 44.1 kHz or 48 kHz frequency. For 44.1, 88.2 and 176.4 kHz, set this bit high. for 48, 96 and 192 kHz, set this bit low. This ensures that the internal ramp generator has the appropriate slope.
||Not synchronized to audio clocks (default)|
||Synchronized to audio clocks|
|RAMP_RATE||Playback Sample Rate|
||48, 96 and 192 kHz (default)|
||44.1, 88.2 and 174.6 kHz|