
TC32306FTG
2015-10-01
21
Fig 6-8 Receiver Block Diagram
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].
Table 6-16 LNA Gain Control
h'0E[D7]
Lna_gain1
h'0E[D6]
Lna_gain0
LNA Relative Gain
(Reference value)
0
0
0 (Initial)
0
1
+0.8dB
1
0
+1.7dB
1
1
+2.5dB
Above are reference values at 315 MHz.
Fig 6-9 Receiver Gain Distribution
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.
RF_DEC
RF_OUT
Matching
Network
A_VDD_3V
PLL
Divider
RF_IN
LNA
VCO
MIX
IF Filter
DATA_IO
IFAMP
Detector
LPF
(FSK)
BRF
ADC
LPF
(ASK)
RSSI_OUT
Data
COMP
RSSI
Limiter
Matching
Network
Matching
Network
LNA
IF Filter
IFAMP
SAW
Filter
RF_IN
35dB
31dB
MIX
51dB
reference value at 315 MHz