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参数资料
| 型号： | TLV320AIC27TPFB |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP48 |
| 封装： | PLASTIC, TQFP-48 |
| 文件页数： | 21/54页 |
| 文件大小： | 732K |
| 代理商： | TLV320AIC27TPFB |
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TLV320AIC27
STEREO AUDIO CODEC
SLAS253A – MARCH 2000 – REVISED SEPTEMBER 2000
28
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
play master volume registers (index 02h, 04h and 06h) (continued)
Table 9. Volume Register Function
MUTE
Mx4...Mx0
FUNCTION
0
0 0000
0-dB attenuation
0
0 0001
1.5-dB attenuation
0
1 1111
46.5-dB attenuation
1
x xxxx
∞-dB attenuation
master tone control register (index 08h)
This is an optional register for support of tone controls (bass and treble). The TLV320AIC27 does not support
bass and treble, and writing to this register has no effect. Reading results in all
don’t care values.
PC beep register (index 0Ah)
This register controls the level of the PC-beep input. Each step corresponds to approximately 3 dB of
attenuation. The register’s MSB is the mute bit. When this bit is set to 1, the level for that channel is set to
–
∞ dB.
The TLV320AIC27 defaults to the PC-beep path being muted, so an external speaker should be provided within
the PC to alert the user when power on self-test problems occur.
Table 10. PC-Beep Register Function
MUTE
PV3...PV0
FUNCTION
0
0000
0-dB attenuation
0
1111
45-dB attenuation
1
xxxx
∞-dB attenuation
analog mixer input gain registers (index 0Ch–18h)
These registers control the gain/attenuation of each of the analog inputs. Each step corresponds to
approximately 1.5 dB. The MSB of the register is the mute bit. When this bit is set to 1, the level for that channel
is set to –
∞ dB (see Table 11).
register 0Eh (mic volume register)
This register has an extra bit used for a 20-dB boost. When bit 6 is set to 1, the 20-dB boost is on. The default
value is 8008h, which corresponds to 0-dB gain with mute on.
The default value for the mono registers is 8008h, which corresponds to 0-dB gain with mute on. The default
value for stereo registers is 8808h, which corresponds to 0-dB gain with mute on.
Table 11. Mixer Gain Control Register Function
MUTE
GX4...GX0
FUNCTION
0
00000
12-dB gain
0
01001
0-dB gain
0
11111
–34.5-dB gain
1
xxxxx
–
∞-dB gain
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