TH7107 데이터 시트보기 (PDF) - Melexis Microelectronic Systems
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TH7107 Datasheet PDF : 16 Pages
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TH7107
315/433MHz
FSK/FM/ASK Transmitter
5 Crystal Pulling
5.1 Center Frequency as Function of CX1 and CX2
The center frequency fC is defined as (fmax + fmin) /2.
typical values at TA = 23 °C and VCC = 3 V:
XTAL = 13.55 MHz, Cload = 15 pF, shown in Fig. 2
CX2 = 1 nF
CX2 = 100 pF
CX1 / pF
22
32
40
49
61
104
fC / MHz
433.612
433.604
433.598
433.596
433.593
433.587
fC / MHz
433.619
433.610
433.604
433.601
433.598
CX2 = 47 pF
fC / MHz
433.625
433.614
433.608
433.604
433.600
433.630
433.625
433.620
433.615
433.610
433.605
433.600
433.595
433.590
10 20 30 40 50 60 70
Cx1/pF
Cx2 = 1nF
CX2 = 100pF
Cx2 = 47pF
Fig. 2: Center frequency vs. CX1, at different CX2
3901007107
Rev. 008
Page 9 of 16
Data Sheet
May/03
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