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參數(shù)資料
| 型號： | MSM7524 |
| 廠商： | OKI SEMICONDUCTOR CO., LTD. |
| 英文描述： | DTMF Transceiver(雙音多頻收發(fā)器) |
| 中文描述： | 雙音多頻收發(fā)器（雙音多頻收發(fā)器） |
| 文件頁數(shù)： | 7/21頁 |
| 文件大小： | 140K |
| 代理商： | MSM7524 |
Semiconductor
MSM7524
7/21
Special tone input and gain adjustment.
FXI- and GS3 are connected to the inverting input and the output of
the on-chip operational amplifiers (IV). The inverting input of the
amplifier (IV) is internally connected to SG.
When not using the special tone detect function, FXI- and GS3
should be wired to each other.
Regarding the gain adjustment, refer to Fig. 3.
Pin No.
Name
I/O
28
FXI–
I
Description
Two input and output pins of the on-chip operational amplifier (V).
These pins are useful to implement the pre-amplifier for Call
Progress Tone receiving.
Refer to Fig. 1.
Voltage gain should be less than 10 (20 dB).
Detect and non-detect amplitude are specified as the receive signal
level at GS2.
30
CPI+
I
R2
R3
SG
IN
C1
FXI-
GS3
–
+
R2, R3,
≥
50 k
W,
C1 = 2.2 μF
Voltage Gain; R3/R2
￡
10 (20 dB)
Figure 3 Receive Gain Adjustment for FX
31
CPI–
I
32
GS2
O
29
GS3
O
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