參數(shù)資料
型號: AK2305
廠商: Asahi Kasei Microsystems Co.,Ltd
元件分類: Codec
英文描述: Dual PCM CODEC for ISDN TERMINAL ADAPTER
中文描述: 雙PCM編解碼器的ISDN終端適配器
文件頁數(shù): 19/43頁
文件大?。?/td> 481K
代理商: AK2305
ASAHI K ASEI [AK 2305]
C0029-E-02 19 1999/8
DTMF RECEIVER
This circuit detects and decodes the DTMF signal and outputs the 4bits code.
See the following table.
Output code table (n=0,1)
Low Tone
[Hz]
[Hz]
1209
1
1336
2
697
1477
3
1209
4
1336
5
770
1477
6
1209
7
1336
8
852
1477
9
1336
0
1209
*
941
1477
#
697
1633
A
770
1633
B
852
1633
C
941
1633
D
High Tone
KEY
DTO
n3
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
DTO
n2
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
DTO
n1
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
DTO
n0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
DECODED OUTPUT
Decoded DTMF signals are output at DTO00-03,10-13 pins through tri-state buffers.
The outputs are enabled by DTOE pin.
DTOE
Input
DTO00-03, DTO10-13
Output
0
Hi-Impedance
1
Decoded Output
GUARD TIME SETTING
Input Signal Available Time(t
RE C
) and Inter Digit Pause Time(t
ID
) can be settled by adjusting Guard Time as
follows. Guard Time is adjusted by GTPn, GTAn(n=0-3.)
Input Signal Available Time
(t
REC
)
= Detecting Signal Time
(t
DP
)
+ Guard Time
(t
GTP
)
Inter Digit Pause Time
(t
ID
)
= Detecting Signal-stop Time
(t
DA
)
+ Guard Time
(t
GTA
)
Range of adjusting Guard Time
(t
GTP
, t
GTA
)
Step of adjusting Guard Time
(t
GTP
, t
GTA
)
1ms - 121 ms
8ms
Regarding the relation between GTPn / GTAn(n=0-3) and Guard Time, see the next page.
Also the relation between Input Signal Available Time
(t
REC
)
and Inter Digit Pause Time
(t
ID
)
is shown.
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