TH7107 Datasheet, PDF (8/14 Pages) List of Unclassifed Manufacturers – FSK/FM/ASK Transmitter

TH7107
315/433MHz
FSK/FM/ASK Transmitter
Crystal Parameter
Parameter
Crystal frequency
Load capacitance
Static capacitance
Resonance resistance
Spurious response
Symbol
f_crystal
C_load
C₀
R_m
a_spur
Condition
fundamental mode, AT
Min
9.69
10
Max
14
15
7
60
-10
Unit
MHz
pF
pF
Ω
dB
Center Frequency as Function of CX1 and CX2
The center frequency f_C is defined as (f_max + f_min) /2.
typical values at T_a = 23 °C and V_cc = 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
f_C / MHz
433.612
433.604
433.598
433.596
433.593
433.587
f_C / MHz
433.619
433.610
433.604
433.601
433.598
CX2 = 47 pF
f_C / 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
Fig. 2: Center frequency vs. CX1, at different CX2
Cx2 = 1nF
CX2 = 100pF
Cx2 = 47pF
3901007107
Rev. 005
Page 8 of 14
Data Sheet
Dec. 2001