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參數資料
| 型號： | LC78681E |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| 封裝： | QFP-64 |
| 文件頁數： | 10/23頁 |
| 文件大小： | 241K |
| 代理商： | LC78681E |
Mute Control Circuit
Volume can be reduced by 12 dB (MUTE –12 dB) or muted fully (MUTE
∞ dB) by issuing the commands shown above.
Muting switches at zero crossings to prevent switching noise on the audio output. A zero crossing is judged to be any
data where the upper seven bits are all 1 or all 0.
Bilingual Function
The left and right channels are output to the left and right channels when reset or when the Stereo command (28H) is
issued.
Left channel data is output to both the left and right channels when the Left Channel Set command (29H) is issued.
Right channel data is output to both the left and right channels when the Right Channel Set command (2AH) is
issued.
Deemphasis Control (pin 29: EMPH)
The preemphasis on/off bit in the Q subcode data is output on EMPH. Deemphasis is required when EMPH is high.
D/A Converter Interface (pin 31: WCLK, pin 33: LRCLK, pin 35: DFOUT and pin 36: DACLK)
D/A converter data is output in MSB-first format from DFOUT, in synchronization with the falling edge of DACLK.
Issuing the CD-ROM XA command causes data which does not undergo interpolation or muting control to be output on
DFOUT (when CD-ROM XA is supported). Because the Reset command for CD-ROM XA is common with the CONT
reset on pin 60, caution is required.
LC78681 D/A Converter Interface
No. 4521-18/23
LC78681E
MSB
LSB
Command
RES = low
0 0 0 0 0 0 0 1
Mute
0 dB
0 0 0 0 0 0 1 0
Mute
–12 dB
0 0 0 0 0 0 1 1
Mute
∞ dB
MSB
LSB
Command
RES = low
0 0 1 0 1 0 0 0
STO CONT
0 0 1 0 1 0 0 1
Lch CONT
0 0 1 0 1 0 1 0
Rch CONT
MSB
LSB
Command
RES = low
1 0 0 0 1 0 0 0
CD-ROM XA
1 0 0 0 1 0 1 1
CONT and CD-ROM XA Reset
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