ZHCSGH3A March 2016 – July 2017 TAS5782M
PRODUCTION DATA.
The classic example here is running a 96-kHz sampling system. Given the clock tree for the device (shown in Figure 65), a non-audio clock rate cannot be brought into the MCLK to the PLL in master mode. Therefore, the PLL source must be configured to be a GPIO pin, and the output brought back into another GPIO pin.
Figure 67. Generating Audio Clocks Using Non-Audio Clock Sources
The clock flow through the system is shown in Figure 67. The newly generated MCLK must be brought out of the device on a GPIO pin, then brought into the MCLK pin for integer division to create SCLK and LRCK/FS outputs.
NOTE
Pull-up resistors should be used on SCLK and LRCK/FS in master mode to ensure the device remains out of sleep mode.