TH71081 Datasheet, PDF (6/10 Pages) List of Unclassifed Manufacturers – 868/915MHz ASK Transmitter / LO Source

TH71081
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
Start-up time
P_o
∆f_FM
f_mod
R_ASK
P_ref
P_harm
P_off
PN
K_VCO
I_CP
t_on
adjustable with
varactor and V_FM
NRZ
@ f_c ± f_ref
@ 2f_c , 3f_c , 4f_c
V_PS ≤ 0.1V
@ f_c ± 500kHz
from ”all OFF” to any
other mode
Typ
-2
±6
5
40
-44
-40
-60
-87
300
±260
Max
Unit
dBm
kHz
kHz
kbit/s
dBm
dBm
dBm
dBc/Hz
MHz/V
µA
0.9
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
1
≤-40
9.5
-2
≤-40
8.5
-5
≤-40
15
4.7
0.7
7.8
-8
≤-45
24
4.7
0.5
7.0
-12
≤-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
-15
≤-50
Unit
MHz
pF
pF
Ω
dB
3901071081
Rev. 004
Page 6 of 10
Data Sheet
Dec. 2001