RF8889A Datasheet, PDF (22/26 Pages) RF Micro Devices – SP10T ANTENNA SWITCH MODULE

RF8889A
Theory of Operation
Product Description
The RF8889A is a SP10T Antenna Switch Module (ASM) with integrated dual low pass filters on GSM transmit paths optimized
for best in class out of band attenuation and insertion loss. This simplifies the phone design by eliminating the need for dis-
crete harmonic filters, and possible matching components. Integrated filtering provides ETSI compliant harmonic suppression
at the antenna port even under mismatch conditions, which is important as modern antennas today often present a load that
significantly deviates from nominal impedance.
The GSM RX ports of this module have symmetrical performance, and hence the Rx branches can be used interchangeably
from 869MHz to 1990MHz which allows for ultimate user flexibility. This module also features an integrated charge-
pump/decoder which allows for excellent linearity performance even at 1.3V GPIO. The decoder allows the switch to be con-
trolled in any of the specified ten states as defined by the control logic using 4 general-purpose I/O control lines.
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