tda5100a Infineon Technologies Corporation, tda5100a Datasheet - Page 10

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

Wireless Components
Table 3-2
Pin
No.
1
2
3
4
Symbol
PDWN
GND
VS
LF
V
3.2 Pin Definitions and Functions
S
1
Interface Schematic
V
1 5 0 kΩ
2 5 0 kΩ
5 kΩ
3 5 kΩ
1 4 0 p F
S
4 0 µA ∗ D A T A
4
1 0 kΩ
1 5 p F
"O N "
3 - 3
Disable pin for the complete transmitter cir-
cuit.
A logic low (PDWN < 0.7 V) turns off all
transmitter functions.
A logic high (PDWN > 1.5 V) gives access to
all transmitter functions.
PDWN input will be pulled up by 40 µA inter-
nally by setting DATA to a logic high-state.
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 3) as short as possible.
General ground connection.
Output of the charge pump and input of the
VCO control voltage.
The loop bandwidth of the PLL is 150 kHz
when only the internal loop filter is used.
The loop bandwidth may be reduced by
applying an external RC network referencing
to the positive supply VS (pin 2).
Function
Functional Description
Specification, March 2001
TDA 5100A
preliminary