TRC103 데이터 시트보기 (PDF) - RF Monolithics, Inc
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TRC103 Datasheet PDF : 65 Pages
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T R C 1 0 3 S e c o n d IF F ilte r D e ta ils
F CBW
B u tte r w o th L o w -p a s s F ilte r fo r F S K
2 *F OPP - F CPP
F OPP
F CPP
P o ly p h a s e B a n d -p a s s F ilte r fo r O O K
Figure 5
After filtering, the I and Q signals are each amplified by a chain of 11 amplifiers having 6 dB of gain each. The
outputs of these amplifiers and their intermediate 3 dB nodes are used to evaluate the received signal strength
(RSSI). Limiters are located behind the 11 amplifiers of the I and Q chains and the signals at the output of these
limiters are used by the FSK demodulator. The RSSI output is used by the OOK demodulator. The global band-
width of the whole base-band chain is given by the bandwidths of the passive filter, the Butterworth filter, the am-
plifier chain and the limiter. The maximum achievable global bandwidth when the bandwidths of the first three
blocks are programmed at their upper limit is about 350 kHz.
2.4 Crystal Oscillator
Crystal specifications for the TRC103 reference oscillator are given in Table 3. RFM recommends the XTL1020P
crystal, which is specifically designed for use with the TRC103. Note that crystal frequency error will directly trans-
late to carrier frequency, bit rate and frequency deviation error.
Specification
Nominal frequency
Load capacitance for Fs
Motional resistance
Motional capacitance
Shunt capacitance
Calibration tolerance at 25 °C
Min
Typical
Max
-
12.80000
(fundamental)
-
13.5
15
16.5
-
-
50
5
-
20
1
-
7
-
±10
Stability over temperature range
(-40 °C to 85 °C)
1
-
±15
Units
MHz
pF
Ω
fF
pF
ppm
ppm
Aging in first 5 years
-
-
±2 ppm/yr
Table 3
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Page 9 of 65
TRC103 - 10/16/12
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