TRF6900
SINGLE-CHIP RF TRANSCEIVER
SLAS213C – SEPTEMBER 1999 – REVISED MAY 2000
APPLICATION INFORMATION
A typical application schematic for an FSK system operating in the European 868 MHz to 870 MHz ISM band is shown
in Figure 27.
FLT-SMD
BPF1
FLT-SMD
BPF2
L3
C9
L4
12 nH
1.2 pF
33 nH
C15
47 nF
C8
44
43
42
41
40
39
38
nd
37
48
47
46
45
150 pF
36
35
DEM_VCC
1
2
2
IF
LNA_GND
LNA
C7
Amplifier/
Limiter
J4
100 pF
st
L7
2.2 µH
5%
C17
R28
1
C16
IF Amp
LNA_in
100 pF
1%
5.6 kΩ
FM/FSK
RF Buffer
Amplifier
18 pF
SMA/B/L
34
33
L2
Demodulator
RF
Mixer
3
6.8 nH
LNA_GND
RSSI_OUT
C6
Buffer
Amplifier
470 pF
Data Switch
4
5
PA_VCC
AMP_IN
32
31
C40
150 pF
C19
C5
LPF Amplifier/
L1
Power Amplifier
AMP_CAP
15 pF
150 pF
Post-Detection
Amplifier
5.6 nH
R5
22 kΩ
R4
C18
6
7
TBD
AMP_OUT
S&H_CAP
220 pF
30
29
28
PA_GND
C4
3.3 pF
J1
PLL_GND
Data
RF_Out
TRF6900
(TOP VIEW)
Slicer
SMA/B/L
R3
C20
8
9
PD_SET
DATA_OUT
12 nF
68 kΩ
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
820 pF
8.2 kΩ
STDBY
STROBE
12
25
PLL_VCC
TX_DATA
LOCKDET
C1
8.2 nF
VCO
13
14
15 16 17 18 19 20 21
22 23 24
R1
10 kΩ
C41
R7
L8
10 nH
CQ1
C24
6.8 pF
150 pF
820 Ω
18 MHz
C23
3.3 pF
R6
SMV1233–011
V1
1 MΩ
C22
C21
15 pF
15 pF
Figure 27. Typical Application Schematic for 868 to 870 MHz European ISM Band
29
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TI [ TEXAS INSTRUMENTS ]
