TRF6900
SINGLE-CHIP RF TRANSCEIVER
SLAS213C – SEPTEMBER 1999 – REVISED MAY 2000
functional block diagram
48
47
46
45
44
43
42
41
40
39
38
nd
37
2
IF
36
35
34
33
32
31
30
29
28
Amplifier/
Limiter
DEM_VCC
DEM_TANK
DEM_TANK
RSSI_OUT
AMP_IN
1
LNA_GND
LNA_IN
RF Buffer
Amplifier
2
3
RF
Mixer
FM/FSK
Demodulator
RSSI
LNA
LNA_GND
st
1
IF
Amplifier
4
Power
Amplifier
LO Buffer
Amplifier
Buffer
Amplifier
PA_VCC
Data Switch
5
6
PA_OUT
PA_GND
LPF Amplifier/
Post-Detection
Amplifier
AMP_CAP
7
8
AMP_OUT
S&H_CAP
PLL_GND
Data
Slicer
TRF6900
(TOP VIEW)
PD_SET
PD_OUT2
PD_OUT1
9
DATA_OUT
PLL
10
27
26
25
DATA
Direct Digital Synthesizer
Serial
Interface
11
12
and
CLOCK
STROBE
LOCKDET
PLL_VCC
Power-Down Logic
VCO
14
13
15
16
17
18 19
20
21
22
23
24
Terminal Functions
TERMINAL
NAME
I/O
DESCRIPTION
NO.
AMP_CAP
31
I/O
ConnectionforLPFamplifier/post-detectionamplifiercapacitor/resistorusedtoreducetheinternallowpass
filter frequency and to adjust the post-detection gain
AMP_IN
32
30
26
27
28
15
I
O
I
Analog post-detection amplifier input
Analog post-detection amplifier output
Serial interface clock signal
AMP_OUT
CLOCK
DATA
I
Serial interface data signal
DATA_OUT
DDS_GND
O
Digital output of the data slicer, active high
Direct digital synthesizer ground
4
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