TRF6900
SINGLE-CHIP RF TRANSCEIVER
SLAS213C – SEPTEMBER 1999 – REVISED MAY 2000
APPLICATION INFORMATION
A typical application schematic for an FSK system operating in the North American 902 MHz to 928 MHz ISM band
is shown in Figure 28.
DNP
FLT-SMD
BPF2
FLT-SMD
BPF1
L3
C25
C9
L4
8.2 nH
0.1 µF
1 pF
18 nH
C15
0.1 µF
C26
0.1 µF
C8
44
43
42
41
40
39
38
nd
37
48
47
46 45
0.1 µF
C27
0.1 µF
36
35
DEM_VCC
1
2
2
IF
LNA_GND
LNA
C7
Amplifier/
Limiter
J4
C28
3 pF
100 pF
L7
st
C17
100 pF
1%
1
R4
2.2 µH
LNA_in
IF Amp
FM/FSK
10k
RF Buffer
Amplifier
DNP SAT
5%
SMA/B/L
34
33
L2
10 nH
Demodulator
RF
Mixer
3
LNA_GND
RSSI_OUT
C32
C6
Buffer
Amplifier
4.7 pF
1 nF
Data Switch
4
5
PA_VCC
AMP_IN
32
31
C40
0.1 µF
C5
LPF Amplifier/
Power Amplifier
C19
AMP_CAP
1 nF
Post-Detection
Amplifier
L1
330 pF
R5
C18
4.7 nH
6
7
39 kΩ
AMP_OUT
S&H_CAP
100 pF
30
29
28
PA_GND
C4
J1
3.3 pF
PLL_GND
Data
RF_Out
TRF6900
(TOP VIEW)
Slicer
SMA/B/L
R3
8
9
C20
PD_SET
DATA_OUT
100 kΩ
0.1 µF
AMP_OUT
RSSI_OUT
RX_DATA
DATA
PD_OUT2
DATA
10
11
27
26
Direct Digital Synthesizer
and
PD_OUT1
LOCKDET
CLOCK
CLOCK
Serial
R2
STROBE
MODE
Power-Down Logic
Interface
C2
470 pF
6.2 kΩ
STDBY
STROBE
12
25
PLL_VCC
TX_DATA
LOCKDET
C1
4.7 nF
VCO
C30
0.1 µF
13
14
15 16 17 18 19 20 21
22 23 24
R1
10 kΩ
L8, 10 nH
R8
10 kΩ
C41
0.1 µF
C29
R7
CQ1
C24
2.7 pF
0.1 µF
100 Ω
25.6 MHz
C23
2.7 pF
SMV1247–079
SMV1247–079
R6, 1 MΩ
C31
DNP
SAT
V1
V2
C22
10 pF
C21
10 pF
Figure 28. Typical Application Schematic for 902 to 928 MHz North American ISM Band
external component list (5% tolerance unless otherwise noted) for Figure 28
DESIGNATOR DESCRIPTION (SIZE)
VALUE
4.7 nF
470 pF
0.5 pF
3.3 pF
MANUFACTURER
PART NUMBER/COMMENTS
C1
C2
C3
C4
Capacitor
Capacitor
Capacitor
Capacitor
31
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TI [ TEXAS INSTRUMENTS ]
