STB5600 Datasheet PDF | STMicroelectronics

STMicroelectronics STB5600

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.

Part No.	STB5600
Datasheet	STB5600 Download
Manufacturer	STMicroelectronics
Description	GPS RF FRONT-END IC
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DESCRIPTION

PIN CONNECTION (top view) DataSh ee August 1998 1/10 DataSheet4U.com DataSheet4U.com DataSheet 4 U .com 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 differential drive to the STB5600. A similar circuit can be used to feed the LO signal if using the recommended low-cost oscillator circuit (appendix A.3). Note that the STB5600 radio architecture and the oscillator described here are covered by various patents held by SGS-Thomson and by others. The use of the circuits described in this data-sheet for any other purpose may infringe such patents.