Datasheet

TLV320AIC1110
SLAS359 – DECEMBER 2001
27
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PRINCIPLES OF OPERATION
receive operation (continued)
receive volume control
The values in the volume control PGA control registers provide volume control for the earphone. Volume control
gain is set from 0 dB to –18 dB in 2-dB steps through the I
2
C interface. The default RX volume control gain
is 0 dB.
Table 5. RX Volume Control
BIT NAME RELATIVE GAIN
RV3 RV2 RV1 RV0 MIN TYP MAX UNIT
0 0 0 0 –0.2 0 0.2 dB
0 0 0 1 –2.2 –2 –1.8 dB
0 0 1 0 –4.2 –4 –3.8 dB
0 0 1 1 –6.2 –6 –5.8 dB
0 1 0 0 –8.2 –8 –7.8 dB
0 1 0 1 –10.2 –10 –9.8 dB
0 1 1 0 –12.2 –12 –11.8 dB
0 1 1 1 –14.2 –14 –13.8 dB
1 0 0 0 –16.2 –16 –15.8 dB
1 0 0 1 –18.2 –18 –17.8 dB
earphone amplifier
The analog signal can be routed to either of two earphone amplifiers: one with a differential output (EAR1ON
and EAR1OP) capable of driving a 8-Ω
load, or one with a single-ended output (EAR2O) capable of driving a
8-Ω load.
earphone mute function
Muting can be selected by setting bit 3 of the power control register through the I
2
C interface.
receive PCM data format
 Companded mode: 8 bits are received, the most significant (MSB) first.
 Linear mode: 15 bits are received, MSB first.