Data Sheet

FSC-BT806BDatasheet
Shenzhen Feasycom Technology Co.,Ltdwww.feasycom.com
-23-
ADC Sample Rate Selection
Each ADC supports the following pre-defined sample rates, although other rates are programmable, e.g. 40kHz:
8kHz
11.025kHz
16kHz
22.050kHz
24kHz
32kHz
44.1kHz
48kHz
ADC Audio Input Gain
The picture below shows that the FSC-BT806B audio input gain consists of:
An analogue gain stage based on a pre-amplifier and an analogue gain amplifier
A digital gain stage
Figure 11: Audio Input Gain
ADC Pre-amplifier and ADC Analogue Gain
FSC-BT806B 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
At mid to high gain levels it acts as a microphone pre-amplifier
At low gain levels it acts as an audio line level amplifier
ADC Digital Gain
A digital gain stage inside the ADC varies from -24dB to 21.5dB, see following table. There is also a fine gain interface
with a 9-bit gain setting allowing gain changes in 1/32 steps, for more infomation contact Feasycom.
The firmware controls the audio input gain.