SBAS495D June 2010 – August 2021 PCM9211
PRODUCTION DATA
To use an external ADC instead of the integrated ADC, the PCM9211 supports External ADC Mode. This option enables a connection with an external, 192-kHz capable ADC via the MPIO_B ports. The external ADC must be a clock slave to the PCM9211. The clock source for the external ADC can be selected using Register 42h/ADCLK (the same register that controls the clock source for the internal ADC).
To lower power consumption in the PCM9211, the onboard ADC can be set to power-down state using Register 40h/ADDIS.
To use the external ADC mode, Register 6Fh/MPBSEL must be set to '101' (External Slave ADC Input). Then, each MPIO_B port is assigned for MPIO_B0 = EASCKO (output), MPIO_B1 = EABCKO (output), MPIO_B2 = EALRCKO (output), and MPIO_B3 = EADIN (input). The MPIO_B pins should be connected according to this configuration: