JAJSNP5 January 2024 TAC5411-Q1
ADVANCE INFORMATION
Along with the digital volume control, this device also provides programmable channel gain calibration. The gain of each channel can be finely calibrated or adjusted in steps of 0.1dB for a range of –0.8dB to 0.7dB gain error. This adjustment is useful when trying to match the gain across channels resulting from transducer sensitivity and load impedance mismatch. This feature, in combination with the regular digital volume control, allows the gains across all channels to be matched for a wide gain error range with a resolution of 0.1dB. Table 6-25 shows the programmable options available for the channel gain calibration.
P0_R104_D[7:4] : DAC_CH1A_FGAIN[3:0] | CHANNEL GAIN CALIBRATION SETTING FOR INPUT CHANNEL 1A |
---|---|
0000 = 0d | Input channel 1 gain calibration is set to –0.8dB |
0001 = 1d | Input channel 1 gain calibration is set to –0.7dB |
… | … |
1000 = 8d (default) | Input channel 1 gain calibration is set to 0dB |
… | … |
1110 = 14d | Input channel 1 gain calibration is set to 0.6dB |
1111 = 15d | Input channel 1 gain calibration is set to 0.7dB |
Similarly, the channel gain calibration setting for input channels 1B,2A and 2B can be configured using the DAC_CH1B_CFG1 (P0_R106), DAC_CH2A_CFG1 (P0_R111), and DAC_CH2B_CFG1 (P0_R113) register bits, respectively.