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參數(shù)資料
| 型號： | TDA5200 |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 元件分類： | 參考電壓二極管 |
| 英文描述： | surface mount silicon Zener diodes |
| 中文描述： | 表面貼裝硅穩(wěn)壓二極管 |
| 文件頁數(shù)： | 23/43頁 |
| 文件大?。?/td> | 911K |
| 代理商： | TDA5200 |
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Applications
4 - 3
TDA 5200
Wireless Components
Specification, March 2000
RSSI-AGC.wmf
Figure 4-2
RSSI Level and Permissive AGC Threshold Levels
The switching point should be chosen according to the intended operating sce-
nario. The determination of the optimum point is described in the accompanying
Application Note, a threshold voltage level of 1.8V is apparently a viable choice.
It should be noted that the output of the 3VOUT pin is capable of driving up to
50μA, but that the THRES pin input current is only in the region of 40nA. As the
current drawn out of the 3VOUT pin is directly related to the receiver power con-
sumption, the power divider resistors should have high impedance values. R4
can be chosen as 120k
, R5 as 180k
to yield an overall 3VOUT output current
of 10μA.
Note:
If the LNA gain shall be kept in either high or low gain mode this has to
be accomplished by tying the
THRES
pin to a fixed voltage. In order to achieve
high gain mode operation, a voltage higher than 2.8V shall be applied to the
THRES
pin, such as a short to the
3VOLT
pin. In order to achieve low gain
mode operation a voltage lower than 0.7V shall be applied to the
THRES
, such
as a short to ground.
As stated above the capacitor connected to the
TAGC
pin is generating the gain
control voltage of the LNA due to the charging and discharging currents of the
OTA and thus is also responsible for the AGC time constant. As the charging
and discharging currents are not equal two different time constants will result.
The time constant corresponding to the charging process of the capacitor shall
be chosen according to the data rate. According to measurements performed
at Infineon the capacitor value should be greater than 47nF.
L
i
0
0.5
1
1.5
2
2.5
3
-120
-110
-100
-90
-80
-70
-60
-50
-40
-30
Input Level at LNA Input [dBm]
U
T
R
L
i
RSSI Level
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| TDA5201_10 | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:ASK Single Conversion Receiver |
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