Datasheet

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SLAS357 − DECEMBER 2001
12
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PRINCIPLES OF OPERATION
microphone mute function
Transmit channel muting can be selected by setting MICMUTE high. Muting provides 80-dB attenuation of the
input microphone signal.
receive operation
earphone amplifier
The analog signal is routed to the earphone amplifier differential output (EAROUT− or EAROUT+), which is
capable of driving a load as low as 8 Ω. EAROUT is recommended for use as a differential output.
earphone mute function
Receive channel muting can be selected by setting the EARMUTE terminal to high.
receive PCM data format
D Companded mode: 8 bits are received, the MSB first
D Linear mode: 13 bits are received, the MSB first
Table 2. Receive Data Bit Definitions
BIT NO. COMPANDED
MODE
LINEAR
MODE
1 CD7 LD12
2 CD6 LD11
3 CD5 LD10
4 CD4 LD9
5 CD3 LD8
6 CD2 LD7
7 CD1 LD6
8 CD0 LD5
9 − LD4
10 − LD3
11 − LD2
12 − LD1
13 − LD0
14 − RXVOL2
15 − RXVOL1
16 − RXVOL0