TLC320AD91 Datasheet, PDF (23/43 Pages) Texas Instruments – Stereo Audio Codec

The default value of this register is 8000h which corresponds to maximum attenuation with mute on. The
PCBEEP register definitions are listed in Table 2–7.
Table 2–7. PCBEEP Register Definitions
MUTE PV3 – PV0
FUNCTION
0000
0-dB Attenuation
0
...
...
1111
45-dB Attenuation
1
xxxx
Maximum attenuation (mute)
2.3.4 Analog Mixer Input Gain Registers (Index 0Ch – 18h)
The Analog Mixer Input Gain registers (Phone Volume, Mic Volume, Line In Volume, CD Volume, Video
Volume, Aux Volume, PCM Out Volume) control the gain and attenuation for each of the analog inputs
except PCBEEP. Each step corresponds to approximately 1.5 dB. The MSB of each register is the mute bit.
When this bit is set to 1, the level for that channel is set at maximum attenuation.
Register 0Eh (Mic Volume register) has an extra bit for a 20-dB boost. When bit D6 is set to 1, the 20-dB
boost is on. The default value of this register is 8008h which corresponds to 0-dB gain with mute on.
The default value for the mono (Phone Volume, Mic Volume) registers is 8008h which corresponds to 0-dB
gain with mute on. The default value for the stereo registers is 8808h which corresponds to 0-dB gain with
mute on. The Analog Mixer Input Gain register definitions are listed in Table 2–8.
Table 2–8. Analog Mixer Input Gain Register Definitions
MUTE Gx4 – Gx0
FUNCTION
0 0000 12-dB Gain
...
...
0
0 1000 0-dB Gain
...
...
1 1111 –34.5-dB Gain
1
x xxxx Maximum attenuation (mute)
2.3.5 Record Select Control Register (Index 1Ah)
The Record Select Control registers are used to select the record source, independently, for the right and
left channels. See Tables 2–9 and 2–10 for the legend.
The default value of this register is 0000h which corresponds to MIC_IN. The Record Select Control register
definitions are listed in Tables 2–9 and 2–10.
Table 2–9. Right Record Select Control Register Definitions
SR2 – SR0 RIGHT RECORD SOURCE
000
MIC_IN
001
CDR
010
VIDEO_R
011
AUXR
100
LINER
101
Stereo Mix (R)
110
Mono Mix (R)
111
PHONE
2–11