CSR8645蓝牙耳机的 “ADC Pre-amplifier” 和 “ADC Analogue Gain”在哪里调 ？

mybtspeaker806

附图是 CSR8645datasheet中的一段话，如下：

9.2.5ADC Pre-amplifier and ADC Analogue Gain

CSR8645 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, see

Figure 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：

秋天

.......

tiger-gz

在PSKEY里有ADC 和 DAC 的增益设置

骑着蜗牛上高速

CVC可以调的，，，

tiger-gz

==============================================================================
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   [2:0] set the analogue gain    (5 = unity gain)
        Bits   [7:4] set the digital gain     (0 = unity gain)
        Bits   [9:8] set the sigma-delta gain (0 = nominal)
       
        On BlueCore2-External, this is
        Bits   [2:0] 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   [3:0] set the analogue gain    (8 = optimum noise)
        Bits   [7:4] set the digital gain     (0 = unity gain)
        Bit      [8] enables scaling down of DAC outputs
       
        On BlueCore 2 External, the bits are
        Bits  [3:0] set the gain (0xF = maximum)
       
        Only useful for BlueCore 2.

mybtspeaker806

学习了，谢谢二位大侠

Ascend

支持楼主，很好很棒很强大！

h11x10d05

参观，参观，浏览，浏览，学习，学习！

xiaolu_csr

不错，学习了，支持

feiyu123000

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