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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)： | 18/21頁 |
| 文件大?。?/td> | 150K |
| 代理商： | MSM7715 |
Semiconductor
MSM7715
18/21
External adjustment of the carrier detection level
R4
R5
VR1
VR2
SG
r
1
r
2
COMP
VREF
r
1
: 300 k
W
, r
2
: 600 k
W
R4 + R5
≥
20 k
W
12
6
11
Figure 11 External Adjustment of the Carrier Detection Level
The carrier detection level is determined by the resistance ratio between the MSM7715's internal
resistors r1 and r2, unless external resistors R4 and R5 are connected.
By connecting external resistors R4 and R5, the detection level can be adjusted. However, the
width of hysteresis cannot be changed.
Ra = R4
￥
r
1
/(R4 + r
1
), Parallel-connected resistance of R4 and r
1
Rb = R5
￥
r
2
/(R5 + r
2
), Parallel-connected resistance of R5 and r
2
V
ON
= 20
￥
log (Rb/(Ra + Rb)) –40.5 (dBm)
V
OFF
= 20
￥
log (Rb/(Ra + Rb)) –42.5 (dBm)
Caution:
r
1
and r
2
may vary in similar proportions over a 0.5 to 2.0
￥
range, due to the lot
variation and temperature variation.
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