CSR8645蓝牙耳机的 “ADC Pre-amplifier” 和 “ADC Analogue Gain”在哪里调 ？
本帖最后由 mybtspeaker806 于 2014-5-16 15:11 编辑附图是 CSR8645datasheet中的一段话，如下：
9.2.5ADC Pre-amplifier and ADC Analogue GainCSR8645 BGA has an analogue gain stage based on an ADC pre-amplifier and ADC analogue amplifier:■ The ADC pre-amplifier has 4 gain settings: 0dB, 9dB, 21dB and 30dB■ The ADC analogue amplifier gain is -3dB to 12dB in 3dB steps■ The overall analogue gain for the pre-amplifier and analogue amplifier is -3dB to 42dB in 3dB steps, seeFigure 9.3■ At mid to high gain levels it acts as a microphone pre-amplifier, see Section 9.2.13■ At low gain levels it acts as an audio line level amplifier
从这段话中得知，CSR8645的音频输入增益是可调的。
请教：
这个增益在哪里调？在config tool 中调，还是在 CVC 中（CSR8600 ROMSeries A03 Parameter Manager）调？
谢谢！
附图：
:):):):):)....... 在PSKEY里有ADC 和 DAC 的增益设置 CVC可以调的，，， ==============================================================================
NAME
PSKEY_CODEC_OUT_GAIN (0x01b7)
SUMMARY
Audio output gain when using built-in codec
TYPE
uint16
DEFAULT VALUE
(0x0005)
DESCRIPTION
Sets the audio output gain when using the built-in codec.
On ROM versions of BlueCore 2, this is:
Bits set the analogue gain (5 = unity gain)
Bits set the digital gain (0 = unity gain)
Bits set the sigma-delta gain (0 = nominal)
On BlueCore2-External, this is
Bits set the gain (7 = maximum gain)
Only useful for BlueCore 2.
==============================================================================
NAME
PSKEY_CODEC_IN_GAIN (0x01b8)
SUMMARY
Audio input gain when using built-in codec
TYPE
uint16
DEFAULT VALUE
(0x0008)
DESCRIPTION
Sets the audio input gain when using the built-in codec.
On ROM versions of BlueCore 2, the bits are
Bits set the analogue gain (8 = optimum noise)
Bits set the digital gain (0 = unity gain)
Bit enables scaling down of DAC outputs
On BlueCore 2 External, the bits are
Bits set the gain (0xF = maximum)
Only useful for BlueCore 2. 学习了，谢谢二位大侠 支持楼主，很好很棒很强大！ 参观，参观，浏览，浏览，学习，学习！ 不错，学习了，支持
tiger-gz 发表于 2014-5-19 17:00
在PSKEY里有ADC 和 DAC 的增益设置
感觉有道理，具体需要验证下
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