TI中文支持网Part Number:TLV320ADC5120
HI TI FAE:
Consultation on AGC function of TLV320ADC5120. After setting the gain of the chip to+6.5dB, can the AGC function ensure that the maximum output signal (SDOUT) of I2S remains unchanged at 1V/RMS when the input signal increases (1V/RMS input).
Amy Luo：
您好，
AGC_LVL ( target level ) 是AGC试图保持ADC输出信号电平的近似输出电平。 TLV320ADC5120允许对不同的目标电平（target level ）进行编程，这些电平的编程范围为–6 dB至–36 dB 相对于满量程信号，AGC_LVL默认值设置为–34 dB。 建议将目标音量设置为有足够的边距，以防止在发出较大声音时出现削波。如下AGC特性：
如上所述，AGC 目标电平是相对于满量程信号的增益，范围是–6 dB ~ –36 dB，不能编程为+6.5dB。
如果您编程的AGC_LVL的幅值在1V/RMS 附近，当输入信号幅值增加时， 那么I2S的输出信号幅值降保持1V/RMS附近 。
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HQ Z：
HI Amy：
We want to set the channel gain to+6.5dB. When the input signal amplitude reaches 1V/RMS, due to the increase in channel gain, the output will definitely be greater than 1V. Can the AGC function be used to limit the output amplitude to no more than 1V/RMS at this time.
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Amy Luo：
Yes, it can. For more details information see the Using the Automatic Gain Controller (AGC) in TLV320ADCx120 Family application report.
