TH72036
868/915MHz
FSK/ASK Transmitter
4.6 AC Characteristics
Power step
0
1
2
3
4
< 3
22
56
120
not connected
RPS / kΩ
4.7 Output Power Steps – ASK Mode
typical values at TA = 23 °C and VCC = 3 V; test circuit shown in Fig. 6
Power step
1
2
3
3.5
7
4
2.4
36
2.8
14
not connected
0
RPS / kΩ
R1 / kΩ
VPSlow
R1
RPS
VPSlow = voltage across RPS if ASK_DTA at 0V
VPShigh = voltage across RPS if ASK_DTA at Vcc
RPS
VPShigh
R1
Vcc
6
6
PSEL
PSEL
If the transmitter is operated at any supply voltage Vcc, the values for R1 and RPS can be calculated as fol-
lows:
VPShigh
VCC ⋅VPSlow
IPSEL ⋅VPShigh
R1 =
RPS = R1
VCC −VPShigh
3901072036
Rev. 005
Page 11 of 16
Data Sheet
June/07
MELEXIS [ Melexis Microelectronic Systems ]
