TDA7100 Datasheet, PDF (26/41 Pages) Infineon Technologies AG – 434 MHz ASK/FSK Transmitter in 10-pin Package

Ref.
IC1
IC2
BAT1
Value
TDA7100
HCS360
battery holder
battery
TDA7100
Applications
Specification
P-TSSOP-10
SO8
HU2031-1, Renata
CR2032, Renata
3.7
Application Hints on the Crystal Oscillator
The crystal oscillator achieves a turn on time less than 1 msec when the specified crystal
is used. To achieve this, a NIC oscillator type is implemented in the TDA7100. The input
impedance of this oscillator is a negative resistance in series to an inductance. Therefore
the load capacitance of the crystal CL (specified by the crystal supplier) is transformed
to the capacitance Cv.
-R
L
f, CL Cv
IC
Figure 14
Formula 1:
Application Hints
1
Cv = _{1 + ω2L}
CL
CL:
crystal load capacitance for nominal frequency
ω:
angular frequency
L:
inductance of the crystal oscillator
Data Sheet
26
V 1.0, 2007-05-02