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A_VDD_3V
RF_OUT
Matching
Network
RF_IN
Matching
LNA
Network
RF_DEC
RSSI_OUT
6.5.2
Receiving Frequency Band
TC32306FTG is available following frequency bands, 315, 434, and 868/915 MHz.
6.5.3
Receiver Gain
Adjust overall gain of receiver block by matching network. The gain of LNA is controlled by the value
of register: h'0E[D7:D6].
SAW
Matching
Filter
Network
RF_IN pin is input of LNA. Input a RF signal via a suitable matching network. RF_OUT pin is output
of LNA and open drain output. Supply voltage via a matching network. See the Evaluation Circuit for
both input and output matching network. About RF_DEC pin, connect a capacitor (1000 pF (typ.)) and
resister (100 Ω (typ.)), such as Fig 6-10 Typical LNA Network.
VCO
Divider
PLL
IF Filter
IFAMP
MIX
RSSI
Fig 6-8 Receiver Block Diagram
Table 6-16 LNA Gain Control
h'0E[D7]
h'0E[D6]
Lna_gain1
Lna_gain0
0
0
0
1
1
0
1
1
Above are reference values at 315 MHz.
RF_IN
LNA
35dB
Fig 6-9 Receiver Gain Distribution
21
LPF
Detector
(FSK)
LPF
ADC
Limiter
(ASK)
LNA Relative Gain
(Reference value)
0 (Initial)
+0.8dB
+1.7dB
+2.5dB
MIX
IF Filter
31dB
reference value at 315 MHz
TC32306FTG
DATA_IO
Data
BRF
COMP
IFAMP
51dB
2015-10-01
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