AS3902 datasheet(7/14 Pages) AMSCO

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ISM 433 MHz ASK Transmitter – Preliminary Data Sheet

AS3902

Rev. A7, December 2000

Page 7 of 14

2.3 ASK Operation

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

Symbol

Parameter

Conditions

Min

Typ

Max

Units

Note

fRF

Transmit frequency

(Europe)

fXTAL = 13.560 MHz

433,920

MHz

POUT,H

Available output power

In 2 k

Ω, TXD = “H“

dBm

POUT,L

Leakage output power

In 2 k

Ω, TXD = “L“

-inf.

-80

dBm

POUT 3rd

Radiated third harmonic

output power

Antenna attenuation

> 20 dB

-30

dBC

PSP

Spurious power

In distance of fCLK or

fXTAL from carrier.

-25

dBC

fCLK

µC clock frequency

3.390

MHz

tSWM

Minimum switch close

time

tSTUP

Start up time

Until clock output

tDRON

Driving amplifier turn on

delay

µs

RASK

ASK data rate range

For a RF packet duty

cycle

≥45 %.

kb/s

tr,f

Carrier rise / fall time

µs

Note:

XTAL tolerances will slightly change the typical transmit frequency.

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

is typical 4 VPP (1.4 VRMS). Actual E.I.R.P. depends on antenna efficiency.

Measurement bandwidth (according to EN 300 220-1) see also figure 10. Actual radiated spurious power depends on antenna

efficentcy and antenna selectivity. Measured with loop antenna (demo board).

Guaranteed, higher data rates possible.

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