CSR8615A04-IQQF-R View Datasheet(PDF) - Unspecified
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MFG CO.
'CSR8615A04-IQQF-R' PDF : 114 Pages View PDF
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13 Figure 9.7: Speaker Output
, 20 9.2.16 Side Tone
r 16 In some applications it is necessary to implement side tone. This side tone function involves feeding a properly
be gained microphone signal in to the DAC stream, e.g. earpiece. The side tone routing selects the version of the
tem microphone signal from before or after the digital gain in the ADC interface and adds it to the output signal before
p or after the digital gain of the DAC interface, see Figure 9.8.
y, Se DAC
da DAC Interface
- Mon Digital Input
Digital Gain
Analogue Output
.com.cn Side Tone Route
Demux
- apachecomm Side Tone Gain
Side Tone
mes Tsao Side Tone Route
Prepared for ja Digital Output
Mux
Digital Gain
Analogue Input
ADC Interface
ADC
Figure 9.8: Side Tone
The ADC provides simple gain to the side tone data. The gain values range from -32.6dB to 12.0dB in alternating
steps of 2.5dB and 3.5dB, see Table 9.5.
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