Not recommended for new designsTH71081
868/915MHz
ASK Transmitter / LO Source
4.4 DC Characteristics
all parameters under normal operating conditions, unless otherwise stated;
typical values at TA = 23 °C and VCC = 3 V
Parameter
Symbol
Condition
Min
Typ
Max
Unit
Standby current
Operating current
Input current
Pull down current
Pull up current
ISBY ENTX=0
ICC ENTX=1, VPS=1.1V
IIN
ENTX=0
IPD ENTX=1
IPS ENTX=1
0.05
0.1
µA
7
9.5
14
mA
-1
1
µA
3
8
30
µA
14
20
24
µA
4.5 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 = 868.3 MHz, test circuit shown in Fig. 2
Parameter
Symbol
Condition
Min
Output power
Reference spurs
Harmonic content
Spurious output signal
VCO gain
Charge pump current
Start-up time
Po
Pref
Pharm
Poff
KVCO
ICP
ton
@ fc ± fref
@ 2fc , 3fc , 4fc
VPS ≤ 0.1V
from “TX standby” to
“TX active” mode
Typ
-2
-44
-40
-60
300
±260
1.0
Max
Unit
dBm
dBm
dBm
dBm
MHz/V
µA
1.2
ms
4.6 Output Power Selection
typical values at TA = 23 °C and VCC = 3 V:
ENTX = 1, fc = 868.3 MHz, test circuit shown in Fig. 2
R1 / kΩ
0
7.5
11
R2 / kΩ
4.7
4.7
VPS / V
Icc / mA
Po / dBm
Pharm / dBm
≥2
12.5
1
≤-40
1.1
9.5
-2
≤-40
0.9
8.5
-5
≤-40
If the transmitter is operated at any supply voltage Vcc,
the values for R1 and R2 can be calculated as allows:
15
4.7
0.7
7.8
-8
≤-45
24
4.7
0.5
7.0
-10
≤-45
R1
=
R2
•
⎜⎜⎝⎛
Vcc
VPS
− 1⎟⎟⎠⎞
3901071081
Rev. 009
Page 7 of 12
43
4.7
0.3
6.2
-15
≤-50
Data Sheet
May/05