NRF902 Datasheet, PDF (6/13 Pages) List of Unclassifed Manufacturers – Single chip 868 MHz Transmitter

PRELIMINARY PRODUCT SPECIFICATION
nRF902 Single chip 868 MHz Transmitter
APPLICATION INFORMATION
FSK Transmit mode
FSK modulation is realised by feeding the modulating data to the digital FSK input
pin (see Figure 6).
X1 13.567MHz
VDD
VDD
Clock
Output
VDD
R1
xtal ¹
R2
2
REXT
3
XO8
VDD ⁴
C
C
1
2
nRF902
8 _VSS
7 _ant1
6 _ant2
5
FSK
Matching Network/
Antenna
Data
Input
Figure 6. FSK transmitter in FSK Transmit mode
In applications where high data rate and low spectrum bandwidth is required an
external varactor may be used to modulate the crystal. For optimum bandwidth usage
a low pass filter should be used to shape the input bit stream, (see Figure 7).
Data
Input
X1 13.567MHz
VDD
VDD
Clock
Output
VDD
R1
xtal ¹
R2
2
REXT
3
XO8
VDD ⁴
C1
C2
nRF902
8 _VSS
7 _ant1
6
ant2
5
FSK
Matching Network/
Antenna
Figure 7. FSK transmitter in FSK Transmit mode for low spectral bandwidth
Nordic VLSI ASA
Revision: 1.0
- Vestre Rosten 81, N-7075 Tiller, Norway - Phone [phone] - Fax [phone]
Page 6 of 13
April 2000