AS3901 Просмотр технического описания (PDF) - austriamicrosystems AG
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AS3901 Datasheet PDF : 18 Pages
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ISM 433/315 MHz FSK/ASK Transmitter – Data Sheet
AS3901
2.3 Transmit Operation
TAMB = 23 °C, VDD = 3.0 V, unless specified otherwise.
Symbol
fRF, EU
fRF, US
foffset
fCLK, EU
fCLK, US
tTXon
tPLLon
TXTon
Parameter
Conditions
Transmit frequency (Europe) fXTAL = 13.560 MHz
Transmit frequency (US)
fXTAL = 9.84375 MHz
Frequency tolerance
After tTXON, no XTAL
tolerance.
µC clock frequency (Europe) fXTAL = 13.560 MHz
µC clock frequency (US)
fXTAL = 9.84375 MHz
Transmitter turn on time
FSK modulator and
driver amplifier
PLL turn on time
XTAL oscillator turn on time
Min Typ Max Units Note
433.920
MHz 1)
315.000
MHz 1)
2 kHz
3.390
3.28125
20
MHz
MHz
µs
t.b.d.
ms
5
ms
Note:
1) XTAL tolerances will slightly change the typical transmit frequency.
2.3.1 ASK Operation
TAMB = 23 °C, VDD = 3.0 V, unless specified otherwise.
Symbol Parameter
Conditions
POUT,H
Available peak output
power
In 2 kΩ , STDBY = ”L”,
TX/ASK = ”H”
POUT,L
Leakage peak output
power
In 2 kΩ , STDBY = ”L”,
TX/ASK = ”L”
POUT 3rd Radiated third harmonic Antenna attenuation>
output power
20 dB
PSP
Spurious power
In distance of fCLK or
fXTAL from carrier. No
antenna selectivity
assumed.
RASK
ASK data rate range
For a RF packet duty
cycle ≥25 %.
Min Typ Max Units Note
-1.5
0
1.5 dBm 1) 3)
-50 dBm
-39 dBm 2)
-45 -25 dBC 2) 3)
0
20 Kb/s
Note:
1) Output power depends on load impedance, differential output current is typical 0.7 mArms. Maximum differential voltage swing
is typical 4 VPP.
2) Measurement bandwidth (close to EN 300 220-1) see also figure 10.
3) Actual E.R.P. depends on antenna efficiency
Rev. 6, August 2000
Page 9 of 18
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