TH7108 Datasheet, PDF (6/10 Pages) List of Unclassifed Manufacturers – 868/915MHz ASK Transmitter / LO Source

TH71082
868/915MHz
ASK Transmitter / LO Source
AC Characteristics
all parameters under normal operating conditions, unless otherwise stated;
typical values at T_a = 23 °C and V_cc = 3 V;
ENTX = 1, V_PS = 1.1V, f_c = 868.3 MHz, test circuit shown in Fig. 2
Parameter
Symbol
Condition
Min
Output power
FM deviation
Modulation frequency FM
Data rate ASK
Reference spurs
Harmonic content
Spurious output signal
Phase noise
VCO gain
Charge pump current
Clock voltage swing
Start-up time
P_o
∆f_FM
f_mod
R_ASK
P_ref
P_harm
P_off
PN
K_VCO
I_CP
V_CKOUT
t_on
adjustable with
varactor and V_FM
@ f_c ± f_ref
@ 2f_c , 3f_c , 4f_c
V_PS ≤ 0.1V
@ f_c ± 500kHz
C_load = 5pF
from ”all OFF” to any
other mode
Typ
-4
±6
5
40
-44
-40
-60
-87
300
±260
2
Max
0.9
Unit
dBm
kHz
kHz
kbit/s
dBm
dBm
dBm
dBc/Hz
MHz/V
µA
V_pp
ms
Output Power Selection
typical values at T_a = 23 °C and V_cc = 3 V:
ENTX = 1, f_c = 868.3 MHz, test circuit shown in Fig. 2
R1 / kΩ
0
7.5
11
R2 / kΩ
4.7
4.7
V_PS / V
≥2
1.1
0.9
I_cc / mA
P_o / dBm
P_harm / dBm
12.5
-2
≤-40
9.5
-5
≤-40
8.5
-8
≤-40
15
4.7
0.7
7.8
-11
≤-45
24
4.7
0.5
7.0
-15
≤-45
If the transmitter is operated at any supply voltage V_cc,
the values for R₁ and R₂ can be calculated as allows:
R₁
= R₂
•

V_cc
V_PS
− 1_{}
Crystal Parameter
Parameter
Symbol
Condition
Min
Crystal frequency
f_crystal fundamental mode, AT
25
Load capacitance
C_load
10
Static capacitance
C₀
Resonance resistance
R_m
Spurious response
a_spur
Max
29
15
7
40
-10
43
4.7
0.3
6.2
-18
≤-50
Unit
MHz
pF
pF
Ω
dB
TH71082 Data Sheet
3901071082
Page 6 of 10
Dec. 2001
Rev. 004