TRF4900_08 Datasheet, PDF (20/25 Pages) Texas Instruments – SINGLE-CHIP RF TRANSMITTER

TRF4900
SINGLEĆCHIP RF TRANSMITTER
SLWS092G − JULY 2000 − REVISED FEBRUARY 2005
APPLICATION INFORMATION
A typical application schematic for an FSK system operating in the North American 902-MHz to 928-MHz ISM band
as shown in Figure 16.
R4
27 kΩ
C1
C32
820 pF
120 pF
1
C6
R1
0.1 µF
10 kΩ
C2
2
R3 ₃
300 kΩ
4
R7
3.9 pF 10 nH
L8
5
V1 ^{10 kΩ}
C4
6
SMV1247−079
CLOCK
3.9 pF
V2
SMV1247−079
R8
7
100 kΩ
8
DATA
9
STROBE
10
MODE
11
STDBY
12
24
PLL
23
TRF4900
Power
Amplifier
22
21
20
19
Serial
Interface
Direct Digital
Synthesizer and
Power-Down Logic
18
C34
17 ^{0.1 µF}
16
15
14
13
NC
R9
15 Ω
LOCKDET
R2
51 Ω
L1
6.8 nH
C14
3.3 pF
C5
0.1 µF
J1
RF_OUT
SMA/B/L
TX_DATA
R5
100 Ω
CQ1
25.6 MHz
or 26 MHz
1M
R6
C24
27 pF
C25
27 pF
C26
SAT
DNP
Figure 16. Typical Application Schematic for 902-MHz to 928-MHz North American ISM Band
20
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265