TDA7210V_10 Datasheet, PDF (28/44 Pages) Infineon Technologies AG – ASK/FSK Single Conversion Receiver

TDA7210V
Applications
As an example the choice of C18 = 22 nF and C13 = 47 nF yields
t2 = 0.44 ms
T2 = 0.71 ms
T3 = 0.53 ms
This means that in this case the inrush current could flow for a duration of 0.64 ms but stops already after 0.49 ms
when the USmax limit has been reached. T3 should always be chosen to be shorter than T2.
It has to be noted finally that during the turn-on duration T2 the overall device power consumption is increased by
the 220 µA needed to charge C13.
The precharge circuit may be disabled if C18 is not equipped. This yields a T2 close to zero. Note that the sum of
R4 and R5 has to be 600 kΩ in order to produce 3 V at the THRES pin as this voltage is internally used also as
the reference for the FSK demodulator.
Data Sheet
28
Revision 1.1, 2010-06-18