TH71072
315/433MHz
ASK Transmitter / LO Source
3901071072 Page 6 of 10 Data Sheet
Rev. 004 Dec. 2001
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
= 433.6 MHz, test circuit shown in Fig. 2
Parameter Symbol Condition Min Typ Max Unit
Output power P
o
-4 dBm
FM deviation
∆f
FM
adjustable with
varactor and V
FM
±6
kHz
Modulation frequency FM f
mod
5kHz
Data rate ASK R
ASK
40 kbit/s
Reference spurs P
ref
@ f
c
± f
ref
-44 dBm
Harmonic content P
harm
@ 2f
c
, 3f
c
, 4f
c
-40 dBm
Spurious output signal P
off
V
PS
≤ 0.1V
-60 dBm
Phase noise PN
@ f
c
± 500kHz
-87 dBc/Hz
VCO gain K
VCO
200 MHz/V
Charge pump current I
CP
±260
µA
Clock voltage swing V
CKOUT
C
load
= 5pF 2 V
pp
Start-up time t
on
from ”all OFF” to any
other mode
0.9 ms
Output Power Selection
typical values at T
a
= 23 °C and V
cc
= 3 V:
ENTX = 1, f
c
= 433.6 MHz, test circuit shown in Fig. 2
R1 / kΩ
Ω Ω
Ω
0 7.5 11 15 24 43
R2 / kΩ
Ω Ω
Ω
4.7 4.7 4.7 4.7 4.7
V
PS
/ V
≥
≥≥
≥ 2
1.1 0.9 0.7 0.5 0.3
I
cc
/ mA 11.5 8.6 7.3 6.2 5.3 4.8
P
o
/ dBm 2 -1 -4 -7 -10 -12
P
harm
/ dBm
≤-40 ≤-40 ≤-40 ≤-45 ≤-45 ≤-50
If the transmitter is operated at any supply voltage V
cc
,
the values for R
1
and R
2
can be calculated as allows:
−•= 1
21
PS
cc
V
V
RR
Crystal Parameter
Parameter Symbol Condition Min Max Unit
Crystal frequency f
crystal
fundamental mode, AT 9.69 14 MHz
Load capacitance C
load
10 15 pF
Static capacitance C
0
7pF
Resonance resistance R
m
60
Ω
Spurious response a
spur
-10 dB
