AS3901 datasheet(9/18 Pages) AMSCO

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ISM 433/315 MHz FSK/ASK Transmitter – Data Sheet

AS3901

Rev. 6, August 2000

Page 9 of 18

2.3 Transmit Operation

TAMB = 23 °C, VDD = 3.0 V, unless specified otherwise.

Symbol

Parameter

Conditions

Min

Typ

Max

Units

Note

fRF, EU

Transmit frequency (Europe) fXTAL = 13.560 MHz

433.920

MHz

fRF, US

Transmit frequency (US)

fXTAL = 9.84375 MHz

315.000

MHz

foffset

Frequency tolerance

After tTXON, no XTAL

tolerance.

kHz

fCLK, EU

µC clock frequency (Europe) fXTAL = 13.560 MHz

3.390

MHz

fCLK, US

µC clock frequency (US)

fXTAL = 9.84375 MHz

3.28125

MHz

tTXon

Transmitter turn on time

FSK modulator and

driver amplifier

µs

tPLLon

PLL turn on time

t.b.d.

TXTon

XTAL oscillator turn on time

Note:

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

Min

Typ

Max

Units

Note

POUT,H

Available peak output

power

In 2 k

Ω, STDBY = ”L”,

TX/ASK = ”H”

-1.5

1.5

dBm

1) 3)

POUT,L

Leakage peak output

power

In 2 k

Ω, STDBY = ”L”,

TX/ASK = ”L”

-50

dBm

POUT 3rd

Radiated third harmonic

output power

Antenna attenuation>

20 dB

-39

dBm

PSP

Spurious power

In distance of fCLK or

fXTAL from carrier. No

antenna selectivity

assumed.

-45

-25

dBC

2) 3)

RASK

ASK data rate range

For a RF packet duty

cycle

≥25 %.

Kb/s

Note:

Output power depends on load impedance, differential output current is typical 0.7 mArms. Maximum differential voltage swing

is typical 4 VPP.

Measurement bandwidth (close to EN 300 220-1) see also figure 10.

Actual E.R.P. depends on antenna efficiency

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