TDA7110 Datasheet, PDF (9/39 Pages) Infineon Technologies AG – ASK/FSK Transmitter 868/433 MHz

TDA7110
Functional Description
2.2 Pin Definitions and Functions
Table 2-2
Pin Symbol
No.
1
PDWN
Interface Schematic¹⁾
Function
Disable pin for the complete transmitter cir-
V_S
cuit.
40 μA ∗ (ASKDTA+FSKDTA) _{A logic low (PDWN < 0.7 V) turns off all}
transmitter functions.
5 kΩ
1
150 kΩ
A logic high (PDWN > 1.5 V) gives access to
all transmitter functions.
"ON"
PDWN input will be pulled up by 40 µA inter-
nally by either setting FSKDTA or ASKDTA
to a logic high-state.
250 kΩ
2
LPD
V_S
40 µA
2
300 Ω
This pin provides an output indicating the
low-voltage state of the supply voltage VS.
VS < 2.15 V will set LPD to the low-state.
An internal pull-up current of 40 µA gives the
output a high-state at supply voltages above
2.15 V.
3
VS
This pin is the positive supply of the trans-
mitter electronics.
An RF bypass capacitor should be con-
nected directly to this pin and returned to
GND (pin 5) as short as possible.
Wireless Components
2-3
Data Sheet, December 2008