SA58646 Datasheet, PDF (1/42 Pages) NXP Semiconductors – UHF 900 MHz transceiver IC

SA58646
UHF 900 MHz transceiver IC
Rev. 01 — 8 February 2007
Product data sheet
1. General description
The SA58646 is a BiCMOS integrated circuit that performs all functions from the antenna
to the microcontroller for reception and transmission for both the base station and the
handset in a 902 MHz to 928 MHz full-duplex radio. The SA58646 may be used in a UHF
push-to-talk walkie-talkie or in a UHF to 900 MHz data transceiver. The SA58646 is a
pin-compatible derivative of the UAA3515 with advanced features.
This IC integrates most of the functions required for a half-duplex or full-duplex radio in a
single integrated circuit. Additionally, the programmability implemented reduces
significantly external components count, board space requirements and external
adjustments.
2. Features
I RF RX (single frequency conversion FM receiver):
N Integrated LNA
N Image reject mixer
N FM detector at 10.7 MHz including an IF limiter, a wide band PLL demodulator, an
output amplifier and a RSSI output
N Carrier detection with programmable threshold
N Programmable data amplifier (slicer) phase
I Synthesizer:
N Crystal reference oscillator with integrated tuning capacitor
N Reference frequency divider
N Narrow band RX PLL including RX VCO with integrated varicaps
N Narrow band TX PLL including TX VCO with integrated varicaps
N VCO external inductors can be done with printed transmission lines on the PCB
which offers substantial savings
N Programmable clock divider with output buffer to drive a microcontroller
I Baseband RX section:
N Programmable RX gain (enable phone volume control)
N Expander with output noise level control
N Earpiece amplifier with volume control feature
N Data amplifier
I Baseband TX section:
N Microphone amplifier
N Compressor with automatic level control and hard limiter
N Programmable TX gain