TDA5102 Datasheet, PDF (12/35 Pages) Infineon Technologies AG – ASK/FSK Transmitter 915 MHz

TDA 5102
Functional Description
8 CLKOUT
V_S
8
300 Ω
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.
A clock frequency of 3.57 MHz is selected
by a logic low at CLKDIV input (pin9).
A clock frequency of 894 kHz is selected by
a logic high at CLKDIV input (pin9).
9
CLKDIV
This pin is used to select the desired clock
V_S
+1.2 V
V_S
division rate for the CLKOUT signal.
A logic low (CLKDIV < 0.2 V) applied to this
pin selects the 3.57 MHz output signal at
60 kΩ
5 µA
CLKOUT (pin 8).
9
A logic high (CLKDIV open) applied to this
60 kΩ
+0.8 V pin selects the 894 kHz output signal at
CLKOUT (pin 8).
10 COSC
V_S
6 kΩ
V_S
10
100 µA
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.
11 FSKOUT
V_S
V_S
200 µA
1.5 kΩ
11
12
This pin is connected to a switch to
FSKGND (pin 12).
The switch is closed when the signal at
FSKDTA (pin 7) is in a logic low state.
The switch is open when the signal at
FSKDTA (pin 7) is in a logic high state.
FSKOUT can switch an additional capacitor
to the reference crystal network to pull the
crystal frequency by an amount resulting in
the desired FSK frequency shift of the trans-
mitter output frequency.
Wireless Components
3-5
Specification, October 2001