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TH71072 Datasheet(PDF) 6 Page - Melexis Microelectronic Systems

Part No. TH71072
Description  315/433MHz ASK Transmitter / LO Source
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Maker  MELEXIS [Melexis Microelectronic Systems]
Homepage  http://www.melexis.com
Logo MELEXIS - Melexis Microelectronic Systems

TH71072 Datasheet(HTML) 6 Page - Melexis Microelectronic Systems

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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 Ta = 23 °C and Vcc = 3 V;
ENTX = 1, VPS = 1.1V, fc = 433.6 MHz, test circuit shown in Fig. 2
Parameter
Symbol
Condition
Min
Typ
Max
Unit
Output power
Po
-4
dBm
FM deviation
∆f
FM
adjustable with
varactor and VFM
±6
kHz
Modulation frequency FM
fmod
5kHz
Data rate ASK
RASK
40
kbit/s
Reference spurs
Pref
@ fc
± f
ref
-44
dBm
Harmonic content
Pharm
@ 2fc , 3fc , 4fc
-40
dBm
Spurious output signal
Poff
VPS
≤ 0.1V
-60
dBm
Phase noise
PN
@ fc
± 500kHz
-87
dBc/Hz
VCO gain
KVCO
200
MHz/V
Charge pump current
ICP
±260
µA
Clock voltage swing
VCKOUT
Cload = 5pF
2
Vpp
Start-up time
ton
from ”all OFF” to any
other mode
0.9
ms
Output Power Selection
typical values at Ta = 23 °C and Vcc = 3 V:
ENTX = 1, fc = 433.6 MHz, test circuit shown in Fig. 2
R1 / k
0
7.5
11
15
24
43
R2 / k
4.7
4.7
4.7
4.7
4.7
VPS / V
≥≥≥≥ 2
1.1
0.9
0.7
0.5
0.3
Icc / mA
11.5
8.6
7.3
6.2
5.3
4.8
Po / dBm
2
-1
-4
-7
-10
-12
Pharm / dBm
≤-40
≤-40
≤-40
≤-45
≤-45
≤-50
If the transmitter is operated at any supply voltage Vcc,
the values for R1 and R2 can be calculated as allows:


=
1
2
1
PS
cc
V
V
R
R
Crystal Parameter
Parameter
Symbol
Condition
Min
Max
Unit
Crystal frequency
fcrystal
fundamental mode, AT
9.69
14
MHz
Load capacitance
Cload
10
15
pF
Static capacitance
C0
7pF
Resonance resistance
Rm
60
Spurious response
aspur
-10
dB


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