TH7107 Datasheet, PDF (9/14 Pages) List of Unclassifed Manufacturers – FSK/FM/ASK Transmitter

TH7107
315/433MHz
FSK/FM/ASK Transmitter
Frequency Deviation as Function of CX1 and CX2
The frequency deviation ∆f 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. 3
CX2 = 1 nF
CX2 = 100 pF
CX1 / pF
22
32
40
49
61
104
± ∆f / kHz
34
25
20
17
13
8
± ∆f / kHz
27
19
14
11.5
9
CX2 = 47 pF
± ∆f / kHz
21
14
10
8
5.5
40
35
30
25
20
15
10
5
0
10
20
30
40
50
60
70
Cx1/pF
Cx2 = 1nF
CX2 = 100pF
Cx2 = 47pF
Fig. 3: Frequency deviation vs. CX1, at different CX2
3901007107
Rev. 005
Page 9 of 14
Data Sheet
Dec. 2001