Data Sheet

FSC-BT1006A Datasheet
Shenzhen Feasycom Technology Co.,Ltdwww.feasycom.com
-25-
5
15.5
13
-8.5
6
18
14
-6
7
21.5
15
-2.5
Table 8: DAC Analogue Gain Rate Selection
Analogue Gain Selection
Value
DAC Analogue Gain
Setting(dB)
Analogue Gain Selection
Value
DAC Analogue Gain
Setting(dB)
7
0
3
-12
6
-3
2
-15
5
-6
1
-18
4
-9
0
-21
DAC Digital FIR Filter
The DAC contains an integrated digital FIR filter with the following modes:
A default long FIR filter for best performance at >= 44.1kHz.
A short FIR to reduce latency.
A narrow FIR (a sharp roll-off at Nyquist) for G.722 compliance. Best for 8kHz/16kHz.
4.8.3 Microphone bias generator
FSC-BT1006A contains an independent low-noise microphone bias generator. The microphone bias generator
isrecommended for biasing electret condensor microphones.
Figure 12: Microphone Biasing
The microphone bias generator provides a selectable output voltage of 1.8 V or 2.6 V nominal and derives its
powerfrom VBAT or VOUT_3V3. No output capacitor is required.
The bias resistor R1 should match the microphone load impedance, and typically is 2.2 kΩ. C1 and C2 are