Tool/software:
Hello,
I routed IN1L and IN1R to the left and right DAC channels respectively. However, when I touched and tapped the microphone of IN1L, small sound was also emitted from the right DAC channel. Conversely, when I tapped the microphone of IN1R, small sound was also emitted from the left DAC channel. What could be the reason for this? How can it be solved? The following is my register configuration:
############################################### # Software Reset ############################################### # # Select Page 0 w 30 00 00 # # Initialize the device through software reset w 30 01 01 # ############################################### ############################################### # Clock Settings # --------------------------------------------- #The input clock signal : MCLK = 11.2896 MHz,BLCK = 1.4 MHz, WCLK = 44.1 kHz ############################################### # # Select Page 0 w 30 00 00 # # NADC = 1, MADC = 2 w 30 12 81 82 # ############################################### ############################################### #AGC ############################################### w 30 00 00 w 30 57 7E w 30 56 F0 w 30 58 58 w 30 59 08 w 30 5A 6A w 30 5B 18 w 30 5C 06 w 30 5F 7E w 30 5E F0 w 30 60 58 w 30 61 08 w 30 62 6A w 30 63 18 w 30 64 06 ############################################### ############################################### # Enable Loopback Page 0 register 29 ############################################### # # Loopback enable for stereo audio data w 30 1D 10 # ############################################### ############################################### # Signal Processing Settings ############################################### # # Select Page 0 w 30 00 00 # # Program OSR for ADC to 64 w 30 14 40 # Set the ADC Mode to PRB_R7 w 30 3d 07 # ############################################### ############################################### # Initialize Codec ############################################### # # Select Page 1 w 30 00 01 # # Disable weak AVDD in presence of external # AVDD supply w 30 01 08 # # Enable Master Analog Power Control w 30 02 00 # w 30 0a 40 # Select ADC PTM_R4 w 30 3d 00 # # Set the input powerup time to 3.1ms (for ADC) w 30 47 32 # # Set the REF charging time to 40ms w 30 7b 01 # ############################################### ############################################### # Recording Setup ############################################### # # Select Page 1 w 30 00 01 #MICBIAS w 30 33 50 # Route IN1L to LEFT_PGA_P with 20K input impedance w 30 34 80 # Route MAL to LEFT_PGA_N with 20K input impedance w 30 36 80 # Route IN1R to Right_PGA_N with 20K input impedance w 30 37 80 # Route MALto Right_PGA_P with 20K input impedance w 30 39 80 # # Unmute Left MICPGA, Gain selection of 6dB to make channel gain 0dB # Register of 6dB with input impedance of 20K => Channel Gain of 0dB w 30 3b 00 # # Unmute Right MICPGA, Gain selection of 6dB to make channel gain 0dB # Register of 6dB with input impedance of 20K => Channel Gain of 0dB w 30 3c 00 # # Select Page 0 w 30 00 00 # # Power up LADC/RADC w 30 51 c0 # # Unmute LADC/RADC w 30 52 00 # ############################################### ############################################### # High Performance Stereo Playback # --------------------------------------------- # PowerTune mode PTM_P3 is used for high # performance 16-bit audio. For PTM_P4, # an external audio interface that provides # 20-bit audio is required. # # For normal USB Audio, no hardware change # is required. # # If using an external interface, SW2.4 and # SW2.5 of the USB-ModEVM must be set to # HI and clocks can be connected to J14 of # the USB-ModEVM. # # Audio is routed to both headphone and # line outputs. ############################################### ############################################### # Clock Settings # --------------------------------------------- # The input clock signal : MCLK = 11.2896 MHz,BLCK = 1.4 MHz, WCLK = 44.1 kHz: MCLK = 11.2896 MHz, ############################################### # # Select Page 0 w 30 00 00 # # NDAC = 1, MDAC = 2 w 30 0b 81 82 # ############################################### ############################################### # Signal Processing Settings ############################################### # # Select Page 0 # w 30 00 00 # # Set the DAC Mode to PRB_P8 w 30 3c 08 # ############################################### ############################################### # Playback Setup ############################################### # # Select Page 1 w 30 00 01 # # De-pop w 30 14 19 # # Route LDAC to HPL/HPR w 30 0c 08 08 # # Route RDAC to LOL/LOR #w 30 0e 10 08 # # Power up HPL/HPR and LOL/LOR drivers w 30 09 30 # # Unmute HPL/HPR driver, 0dB Gain w 30 10 00 00 # # Unmute LOL/LOR driver, 0dB Gain w 30 12 00 00 # # Select Page 0 w 30 00 00 # # DAC => 0dB #w 30 41 00 00 # DRC w 30 41 00 00 w 30 44 73 w 30 45 00 w 30 46 B6 # # # Power up LDAC/RDAC w 30 3f d6 # # Unmute LDAC/RDAC w 30 40 00 # ###############################################
regards.
