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參數(shù)資料
| 型號(hào)： | ML7021 |
| 廠商： | OKI SEMICONDUCTOR CO., LTD. |
| 英文描述： | Echo Canceler |
| 中文描述： | 回聲消除器 |
| 文件頁數(shù)： | 7/24頁 |
| 文件大?。?/td> | 244K |
| 代理商： | ML7021 |
7
Semiconductor
ML7021
(4/4)
Pin
22
Symbol
SYNCO
Type
O
Description
23
SCKO
O
24
RST
I
25
WDT
O
26
GC
I
Input signal by which the gain controller for the RIN input is
controlled and the RIN input level is controlled and howling is prevented.
The gain controller adjusts the RIN input level when it is –10 dBm0 or
above. RIN input levels from –10 to –1.5 dBm0 will be suppressed to
–10 dBm0 in the attenuation range from 0 to 8.5 dB.
RIN input levels above –1.5 dBm0 will always be attenuated by 8.5 dB.
Single Chip or Master Chip in a Cascade Connection
"H": Gain control ON
"L": Gain control OFF
"H" is recommended for echo cancellation.
Slave Chip in a Cascade Connection
Fixed at "L"
This pin is loaded in synchronization with the falling edge of the
INT
signal
or the rising edge of
RST
.
Test program end signal.
This signal is output when one cycle (8kHz) of processing is completed.
Leave it open.
Reset signal.
"L": Reset mode
"H": Normal operation mode
Due to initialization, input signals are disabled for 100
m
s after reset
(after
RST
is returned from L to H).
Input the basic clock during the reset.
Output pins during the reset are in the following states :
High impedance: SOUT, ROUT
"L": WDT
"H":
OF1
,
OF2
Not affected: X2, SYNCO, SCKO,
IRLD
, MCKO
After the power is turned on, initialize the LSI's internal registers by your
execution of H
L sequence 1
m
s later than the master clock starts
normal oscilation.
This LSI starts a normal operation by releasing this pin to H after the
H
L sequence above.
Here, this pin must stay L for 1
m
s or longer.
Transmit clock signal (256 kHz) for the PCM CODEC.
Connect to the SCK pin and the PCM CODEC transmit/receive clock pin.
Leave it open if using an external SCK.
8 kHz sync signal for the PCM CODEC.
Connect to the SYNC pin and the PCM CODEC transmit/receive sync pin.
Leave it open if using an external SYNC.
28
MCKO
O
Basic clock (19.2 MHz).
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