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參數(shù)資料
| 型號： | MSM7715 |
| 廠商： | OKI SEMICONDUCTOR CO., LTD. |
| 英文描述： | Multi-Function Telecommunication LSI |
| 中文描述： | 多功能通信大規(guī)模集成電路 |
| 文件頁數(shù)： | 17/21頁 |
| 文件大小： | 150K |
| 代理商： | MSM7715 |
Semiconductor
MSM7715
17/21
Setting the transmit signal level
Figure 10 Setting the Transmit Signal Level
The modem’s modulated analog signal and DTMF signal are not transmitted at the same time.
The signal to be transmitted is determined by the selected operation mode. This device provides
the pins for individual setting of transmit signal levels.
V
AOM
: Level of the modem signal at the AOUT pin when R1 = R2 (dBm)
V
AODT
: Level of the DTMF signal at the AOUT pin when R1 = R3 (dBm)
When external resistors (R1, R2, R3) are changed, the signal level at AOUT is as follows:
V
AO
(modem) = 20
￥
log (R1/R2) + V
AOM
V
AO
(DTMF) = 20
￥
log (R1/R3) + V
AODT
However, to avoid distorted output, R1
≤
R2 and R1
≤
R3 are needed. In circuit design, R1 = R2
or R1 = R3 with 5% tolerance is permitted.
C4 is a component in the first order LPF for suppressing the out-of-band output noise. Select a
value C4 in such a way that cutoff frequency F
C
determined by R1 and C4 will be approximately
8 kHz.
C4 = 1/ (2
p
￥
R1
￥
F
C
)
RC-LPF
DTMF
Generator
Modulator
AOUT
GAT2
GAT1
DTO
MOD
C4
R2
R1
R3
VAO
4dB
R1, R2, R3
≥
20 k
W
, R1
￡
R2, R1
￡
R3
+
–
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