nRF904 Nordic VLSI, nRF904 Datasheet - Page 5

• Manufacturer Part Number: nRF904
• Description: RF Transmitter 902-928MHz
• Manufacturer: Nordic VLSI

PRODUCT SPECIFICATION
Table 5 provides an overview of the different modes that the nRF904 may be set to.
V
represent the voltage state needed to set a particular mode.
Power Down
Clock
ASK
FSK
FSK modulation is realised by feeding the modulating data to the digital DIN input
pin (see Figure 4). This is the normal operating mode for nRF904.
In applications where high data rate and low spectrum bandwidth is required; a low
pass filter should replace R4 as in Figure 5 to shape the input FSK bit stream. Figure 5
shows both a 1
Nordic VLSI ASA
Revision: 2.1
R1
to V
Mode
VDD
V
V
V
R4
R1
R2
R3
are the control nodes for resistors 1 to 4 (R1 to R4 see Figure 4) and
st
-
Table 5 Overview of Operational Modes for nRF904.
C
1
order (a), and a 2
Vestre Rosten 81, N-7075 Tiller, Norway
R1
Figure 4. nRF904 with External Components.
R2
R3
GND
VDD
VDD
VDD
V
C
2
R1
14.2992MHz
XTAL
REXT
XO8
VDD
X1
1
2
3
4
nd
order (b) low pass filter.
ASK DATA
QhtrÃ$Âsà %
GND
VDD
nRF904
V
-
R2
-
Phone [phone]
VDD or GND
VDD or GND
8
7
6
5
VDD
V
GND
ANT1
ANT2
-
DIN
R3
R4
-
Antenna
V
FSK DATA
Fax [phone]
R4
VDD
V
October 2001
-
-
R4