TDA7210V_10 Datasheet, PDF (27/44 Pages) Infineon Technologies AG – ASK/FSK Single Conversion Receiver

U2
3V
2.4V
TDA7210V
Applications
2
T2
Figure 15 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 USmax = 2.5 V 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--2-^m--2--^a-0-^x--_μ--^â‹--A-C----1---3- = _{2---2-2--,-0-5--μ}-V---A-- ⋅ C13
(17)
Uc
Us
T3
Figure 16 Voltage Transient on Capacitor C13 Attached to Pin 19
Data Sheet
27
Revision 1.1, 2010-06-18