Users Manual

FSC-BT806 Datasheet
Shenzhen Feasycom Technology Co.,Ltdwww.feasycom.com
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Figure 16: Single-ended Input
4.8.3 Output Stage
The output stage digital circuitry converts the signal from 16-bit per sample, linear PCM of variable sampling frequency
to bit stream, which is fed into the analogue output circuitry.
The analogue output circuit comprises a DAC, a buffer with gain-setting, a low-pass filter and a class AB outputstage
amplifier. The picture below shows that the output is available as a differential signal between SPKR_LN and
SPKR_LPfor the left channel, and between SPKR_RN and SPKR_RP for the right channel.
Figure 17: Speaker Output
4.8.4 PCM Controller
The audio PCM interface on the FSC-BT806 supports:
On-chip routing to Kalimba DSP
Continuous transmission and reception of PCM encoded audio data over Bluetooth.
Processor overhead reduction through hardware support for continual transmission and reception ofPCM data
A bidirectional digital audio interface that routes directly into the baseband layer of the firmware. It does notpass
through the HCI protocol layer.
Hardware on the CSR8670 WLCSP for sending data to and from a SCO connection.
Up to 3 SCO connections on the PCM interface at any one time.