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參數(shù)資料
| 型號： | TLV320AIC27TPFB |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP48 |
| 封裝： | PLASTIC, TQFP-48 |
| 文件頁數(shù)： | 22/54頁 |
| 文件大小： | 732K |
| 代理商： | TLV320AIC27TPFB |
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TLV320AIC27
STEREO AUDIO CODEC
SLAS253A – MARCH 2000 – REVISED SEPTEMBER 2000
29
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
record select control register (index 1Ah)
This register is used to select the record source for right and left independently (see Table 12). The default value
is 0000h, which corresponds to mic in.
Table 12. Record Select Register Function
SR2 TO SR0
RIGHT RECORD SOURCE
SL2 TO SL0
LEFT RECORD SOURCE
0
Mic
0
Mic
1
CD in (R)
1
CD in (L)
2
Video in (R)
2
Video in (L)
3
Aux in (R)
3
Aux in (L)
4
Line in (R)
4
Line in (L)
5
Stereo mix (R)
5
Stereo mix (L)
6
Mono mix
6
Mono mix
7
Phone
7
Phone
record gain registers (index 1Ch and 1Eh)
1Ch is for the stereo input and 1Eh is for the optional special-purpose correlated audio mic channel. Each step
corresponds to 1.5 dB. 22.5 dB corresponds to the range 0F0Fh to 000Fh. The MSB of the register is the mute
bit. When this bit is set to 1, the level for that channel(s) is set to –
∞ dB.
The default value is 8000h, which corresponds to 0-dB gain with mute on.
Table 13. Record Gain Register Function
MUTE
GX3...GX0
FUNCTION
0
1111
22.5-dB gain
0
0000
0-dB gain
1
xxxxx
–
∞-dB gain
general-purpose register (index 20h)
This register is used to control several miscellaneous functions of the TLV320AIC27.
Table 14 shows a summary of each bit and its function. Only the MIX, MS, and LPBK bits are supported by the
TLV320AIC27. The MS bit controls the mic selector. The LPBK bit enables loopback of the ADC output to the
DAC input without involving the ac link, allowing for full system-performance measurements. The function
default value is 0000h which is all off.
Table 14. General Purpose Register Function
BIT
FUNCTION
TLV320AIC27
SUPPORT
POP
PCM out path and mute, 0 = pre-3D, 1 = post-3D
Yes, but fixed at 1
ST
Simulated stereo enhancement on/off, 1 = on
No
3D
3D stereo enhancement on/off, 1 = on
Yes
LD
Loudness (bass boost) on/off, 1 = on
No
LLBK
Local loop back—for modem, line codec
No
RLBK
Remote loop back—for modem, line codec
No
MIX
Mono output select 0 = Mix, 1 = Mic
Yes
MS
Mic select 0 = Mic1, 1 = Mic2
Yes
LPBK
ADC/DAC/ loopback mode
Yes
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