GPS RF FRONT-END IC
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STB5600
GPS RF FRONT-END IC
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ONE CHIP SYSTEM TO INTERFACE ACTIVE ANTENNA TO S...
Description
www.DataSheet4U.com
®
STB5600
GPS RF FRONT-END IC
s
s
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ONE CHIP SYSTEM TO INTERFACE ACTIVE ANTENNA TO ST20GP1 MICROCONTROLLER COMPLETE RECEIVER USING NOVEL DUAL CONVERSION ARCHITECTURE WITH SINGLE IF FILTER MINIMUM EXTERNAL COMPONENTS COMPATIBLE WITH GPS L1 SPS SIGNAL INTERNALLY STABILISED POWER RAILS CMOS OUTPUT LEVELS FROM 3.3 TO 5.9V SUPPLY VOLTAGE TQFP32 PACKAGE
TQFP32 MARKING: STB5600 TRACEAB. CODE ASSY CODE
DESCRIPTION The STB5600, using STMicroelectronics HSB2, High Speed Bipolar technology, implements a Global Positioning System RF front-end. The chip provides down conversion from the GPS DataSheet4U.com (L1) signal at 1575 MHz via an IF of 20MHz to an output frequency of 4MHz suitable for ST20GP1 GPS processor. It uses a single external reference oscillator to generate both RF local oscillator signals and the processor reference clock.
PIN CONNECTION (top view)
DataSh
ee
August 1998
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STB5600
FUNCTIONAL DESCRIPTION The STB5600 GPS front-end is fed with the signal from an active antenna, via a ceramic RF filter. The gain between the antenna element and the STB5600 is expected to be between 10dB and 35dB overall, made up of the antenna LNA gain, the feeder loss, connector loss, and the ceramic filter loss. In order to use an off-the-shelf ceramic filter, conventionally 50 Ohms single ended, a matching circuit is used. (see appendix A.1), which provides a 300 Ohm differe...
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