tda5100a Infineon Technologies Corporation, tda5100a Datasheet - Page 11

• Manufacturer Part Number: tda5100a
• Description: Ask Transmitter 434 Mhz
• Manufacturer: Infineon Technologies Corporation

Wireless Components
5
6
7
CLKOUT
COSC
DATA
5
9 0 kΩ
V
S
6 k
3 0 0 Ω
+ 1 .2 V


6 0 k Ω
5 0 p F
10 0

A
7
6
3 0
3 - 4


+ 1 .1 V
A
Digital amplitude modulation can be
imparted to the Power Amplifier through this
pin.
A logic high (DATA > 1.5 V or open) enables
the Power Amplifier.
A logic low (DATA < 0.5 V)
disables the Power Amplifier.
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.
Functional Description
Specification, March 2001
TDA 5100A
preliminary