TDA5204E1 Datasheet, PDF (22/40 Pages) Infineon Technologies AG – ASK Single Conversion Receiver 390MHz

TDA 5204 E1
preliminary
Applications
3
2.5
2
RSSI Level
1.5
1
0.5
0
-120
-110
-100
-90
-80
-70
-60
-50
-40
-30
Input Level at LNA Input [dBm]
Figure 4-2 RSSI Level an Permissive AGC Threhold Level
RSSI-AGC.wmf
The value of the capacitor defines the response time of the AGC. For a stable
control loop the capacitor value should be at least 47nF.
The AGC can be disabled by tying the THRES-pin either to GND or to VCC as
show here:
LNA high gain:
- pin 23 (THRES) shorted to VCC
LNA low gain:
- pin 23 (THRES) shorted to GND
In these cases capacitor and voltage divider are not necessary.
Wireless Components
4-3
Specification, January 2001