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1.3 Block Diagram
Figure 1–1 shows the block diagram for the TRF6900.
Figure 1–1. TRF6900 Block Diagram
48
47
1
LNA_GND
2
LNA_IN
LNA
3
LNA_GND
4
PA_VCC
5
PA_OUT
Power Amplifier
6
PA_GND
7
PLL_GND
8
PD_SET
9
PD_OUT2
PLL
10
PD_OUT1
11
LOCKDET
12
PLL_VCC
VCO
13
14
46
45
44
43
42
RF Buffer
Amplifier
1st IF
RF Mixer
Amplifier
LO Buffer
Amplifier
TRF6900
Direct Digital Synthesizer
and
Power–Down Logic
15
16
17
18
19
41
40
39
38
37
2nd
IF Amplifier/
Limiter
RSSI
FM/FSK
Demodulator
Buffer
Data Switch
Amplifier
LPF Amplifier/
Post–Detection
Amplifier
Data
Slicer
Serial
Interface
20
21
22
23
24
Overview
Block Diagram
36
DEM_VCC
35
DEM_TANK
34
DEM_TANK
33
RSSI_OUT
32
AMP_IN
31
AMP_CAP
30
AMP_OUT
29
S&H_CA
28
DATA_OUT
27
DATA
26
CLOCK
25
STROBE
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