TDA7200 Datasheet, PDF (30/49 Pages) Infineon Technologies AG – ASK/FSK Single Conversion Receiver

TDA7200
Applications
The voltage transient during the charging of C₂ is shown in the following figure:
U2
3V
2.4V
2
T2
Figure 13 Voltage appearing on C18 during precharging process
The voltage appearing on the capacitor C13 connected to pin 20 is shown in the following
figure. It can be seen that due to the fact that it is charged by a constant current source
it exhibits is a linear increase in voltage which is limited to U_Smax = 2.5V which is also the
approximate operating point of the data filter input. The time constant appearing in this
case can be denoted as T₃, which can be calculated with:
T₃
=
U_{S max} × C13
220µA
=
2.5V
220µA
×C13
Data Sheet
30
V 1.0, 2007-05-02