ISM 433 MHz ASK Transmitter – Preliminary Data Sheet
AS3902
Figure 10:
Spurious emissions of the AS3902 measured close to the ETSI EN 300 220-1 recom-
mendation for wide-band equipment, clause 8.7, without modulation, transmitting a con-
stant “H“. (Only difference: 100 kHz RBW was used instead of 120 kHz). The highest
spurious emissions are generated at a carrier distance of 3.39 MHz (µC clock frequency).
The EN 300 220-1 specifies an absolute level of -36 dBm E.I.R.P. for spurious emissions.
This limits the maximum E.I.R.P. for a transmitter using the AS3902 to about -11 dBm.
Measurement was performed over a free-space link using R&S HL040 antenna for re-
ception.
Figure 11: Demodulated RF wave for 10101… data pattern at 32kbit/s (linear scale)
Rev. A7, December 2000
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