TDA5100A Datasheet, PDF (11/29 Pages) Infineon Technologies AG – ASK Transmitter 434 MHz

TDA 5100A
preliminary
Functional Description
5
DATA
+1.2 V
Digital amplitude modulation can be
imparted to the Power Amplifier through this
pin.
60 kΩ
5
90 kΩ
50 pF
+1.1 V
3 0
A
A logic high (DATA > 1.5 V or open) enables
the Power Amplifier.
A logic low (DATA < 0.5 V)
disables the Power Amplifier.
6 CLKOUT
6
300 Ω
7
COSC
V_S
6 k

7
100 A
Clock output to supply an external device.
An external pull-up resistor has to be added
in accordance to the driving requirements of
the external device.
The clock output frequency is 3.39 MHz
when a crystal of 13.56 MHz is used.
This pin is connected to the reference oscil-
lator circuit.
The reference oscillator is working as a neg-
ative impedance converter. It presents a
negative resistance in series to an induc-
tance at the COSC pin.
The resonance frequency of the crystal
should be 13.56 MHz to achieve an output
frequency of 434 MHz.
Wireless Components
3-4
Specification, March 2001