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參數(shù)資料
| 型號(hào)： | MSM6889 |
| 廠商： | OKI SEMICONDUCTOR CO., LTD. |
| 英文描述： | Multi-Function Telecommunication LSI(多功能遠(yuǎn)程通信收發(fā)LSI) |
| 中文描述： | 多功能電信大規(guī)模集成電路（多功能遠(yuǎn)程通信收發(fā)LSI）的 |
| 文件頁數(shù)： | 12/21頁 |
| 文件大?。?/td> | 159K |
| 代理商： | MSM6889 |
12/21
MSM6889
Semiconductor
Figure 2
C1
is an ignorable impedance in the voice frequency band; therefore, if a line transformer and
phone line impedance are ideal (R
L
= 600
W
pure resistance), the signal levels at each point are
as shown below.
VT, VR
VT1, VR1
VAO
VT2
VR2
: Transmit at 2W on phone line, receive signal level (balanced)
: Transmit at pin 3 (AIN+), receive signal level (unbalanced)
: Transmit signal level at pin 5 (AO) (unbalanced)
: Leaking of transmit signal into receive circuit (unbalanced)
: Receive signal level of the device (unbalanced)
1) VT = VT1 = 1/2
￥
VAO
The transmit signal level (voltage) on phone line is half the level at the output pin (AO) of the
device. (600
W
: a
600
W
line transformer is used)
2) VR1 = VR
3)
Then, where R2 = R3 (e.g., 51 k
W)
, VT2 = 0.
This means that the transmit signal is no longer leaking into the receive circuit.
4)
R
L
VT VR
600
W
: 600
W
C1
2.2
m
F
R1
600
W
R2
R3
VT1,VR1
VAO
+
–
+
–
R2,R3
≥
20 k
W
AO
AIN+
AIN–
GAR
VT2,VR2
3
4
2
5
FUNCTIONAL DESCRIPTION AND APPLICATION
Resistance Hybrid Condition (Ideal Condition)
VT2 = VT1
￥
(1+ R3
+
VAO
￥
(– R3
R2
2
R2
R2
= 1
￥
(1+ R3
￥
R3
￥
(1– R3
R2
1
2
R2
VR2 = VR1
￥
(1+ R3
￥
VR1 = 2
￥
VR
R2
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