SA58646

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.

Features

• RF RX (single frequency conversion FM receiver):
• Integrated LNA
• Image reject mixer
• FM detector at 10.7 MHz including an IF limiter, a wide band PLL demodulator, an output amplifier and a RSSI output
• Carrier detection with programmable threshold
• Programmable data amplifier (slicer) phase
• Synthesizer:
• Crystal reference oscillator with integrated tuning capacitor
• Reference frequency divider
• Narrow band RX PLL including RX VCO with integrated varicaps
• Narrow band TX PLL including TX VCO with integrated varicaps
• VCO external inductors can be done with printed transmission lines on the PCB which offers substantial savings
• Programmable clock divider with output buffer to drive a microcontroller
• Baseband RX section:
• Programmable RX gain (enable phone volume control)
• Expander with output noise level control
• Earpiece amplifier with volume control feature
• Data amplifier
• Baseband TX section:
• Microphone amplifier
• Compressor with automatic level control and hard limiter
• Programmable TX gain
• Microcontroller interface:
• 3-wire serial interface
• Other features:
• Voltage regulator to supply internal PLLs
• Selectable voltage doubler
• Programmable low battery detection time multiplexed with RSSI carrier detection

Products/packages

Quality/reliability/chemical content

Quality and reliability disclaimer

Pricing/ordering/availability

Applications

• 902 MHz to 928 MHz full-duplex radio
• UHF to 900 MHz data transceiver
• UHF push-to-talk walkie-talkie

Block diagrams/pinning

Design support

Support Documents

75015689; NXP UHF to 900-MMHz transceiver SA58646 (2006-11-01)

nxp_rf_manual_12th_edition; RF Manual 12th Edition (2009-06-01)

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Disclaimers

• General product disclaimer
• Quality and reliability disclaimer