When i use this chip of SSM2603,I successfully configured this chip through IIC interface,but When I give a fixed value to the pin of PBDAT, the pin output is a fixed 1.7V voltage, and even if I change the input value, the output analog voltage does not change. The MCLK is 12.288MHz,and the sample rate is 48KHz,and the BCLK=MCLK/4.
Why?