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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)： | 4/21頁 |
| 文件大?。?/td> | 140K |
| 代理商： | MSM7524 |
Semiconductor
MSM7524
4/21
PIN DESCRIPTION
–
+
R4
R5
SG
OUT
PBTO/CPTO
PBA/CPA
PBAO/CPAO
GENERATOR
R4, R5,
≥
20 k
W
Voltage Gain; R5/R4
￡
10(20 dB)
Figure 2 Transmit Gain Adjustment
I/O
O
I
I
Name
GS1
PBI–
PBI+
Pin No.
1
2
3
Output and two input pins of the on-chip operational amplifier (1).
These pins are used to implement the pre-amplifier for DTMF tone
receiving. Refer to Fig. 1.
IN
C1
R1
R3
R2
PBI+/CPI+
PBI-/CPI-
GS1/GS2-
SG
(A)
(B)
IN
C1
R2
R3
PBI-/CPI-
PBI+/CPI+
SG
GS1/GS2
+
–
–
+
R1, R2, R3
≥
50 k
W
, C1 = 2.2 μF
Voltage Gain; 1 + R2/R3.........(A)
R2/R3...............(B)
Figure 1 Receive Gain Adjustment
Voltage gain should be less than 10(20 dB).
DTMF receiver's detect and non-detect amplitude are specified as
the receive signal level at GS1.
On-chip signal ground.
The potential is approximately half of VDD.
Output and inverting input pins of the on-chip operational amplifier
(II). The non-inverting input is internally connected to SG. When
not using this amplifier, these pins should be wired to each other.
Call progress tone (CPT) output. Tone amplitude is approximately
0 dBm on CPTO, but the transmit signal level can be adjusted by
using the on-chip operational amplifier (II). Refer to Fig. 2.
Make/Break of CPT transmitting is controlled through the
processor interface.
O
SG
4
O
CPAO
5
I
CPA–
6
O
CPTO
7
Description
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