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参数资料
| 型号： | LC78684E |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP80 |
| 封装： | 14 X 14 MM, QFP-80 |
| 文件页数： | 7/21页 |
| 文件大小： | 152K |
| 代理商： | LC78684E |
LC78684E
No.7350-15/21
MP3 Serial Data Input Timing
Fsck
T2
T3
STCK
STDAT
STREQ
(*Output from the LC78684E)
STCK
STDAT
T1h
T1l
Performing a serial data input operation requires that a serial input command be issued.
If this command has not been issued, the MP3 decoder will not operate, even if clock and data signals are applied to the STCK and
STDAT pins.
Ratings
Parameter
Symbol
min
typ
max
Unit
Transfer clock frequency
Fsck
9.216
MHz
STCK H-level pulse width
T1h
45
ns
STCK L-level pulse width
T1l
45
ns
STDAT/STCK setup time
T2
30
ns
STDAT/STCK hold time
T3
30
ns
: The table below lists the maximum frequencies for the transfer clock during serial input operations.
MODE
Fs (KHz)
Maximum serial transfer clock
frequency (MHz)
MPEG1
48
9.216
44.1
8.4672
32
6.144
MPEG2
24 (12)
4.608
(MPEG2.5)
22.05 (11.025)
4.2336
16 (8)
3.072
The transfer clock rate must be set to a speed less than or equal to the speed shown in the table so that the MP3 decoding
processing will complete in time.
Note that the table above applies when MP3DSET (register 41h, bit 0) is set to 1 (high-speed transfer mode).
The timings shown below apply when MP3DSET is set to 0 (low-speed transfer mode).
Ratings
Parameter
Symbol
min
typ
max
Unit
Transfer clock frequency
Fsck
3.072
MHz
STCK H-level pulse width
T1h
150
ns
STCK L-level pulse width
T1l
150
ns
STDAT / STCK setup time
T2
125
ns
STDAT / STCK hold time
T3
125
ns
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