GP1020

FEBRUARY 1994 DS3605-2.2 GP1020 SIX-CHANNEL PARALLEL CORRELATOR CIRCUIT FOR GPS OR GLONASS RECEIVERS The GP1020 is a six-channel CMOS digital correlator which has been designed to work with the GP1010 L1-channel downconverter or other integrated circuits, and may be used to acquire and track the GPS C/A code or the GLONASS signals. For each of the six channels the GP1020 includes independent digital down-conversion to baseband, C/A code generation, correlation, and accumulate-and-dump registers. The GP1020 interfaces with a microprocessor via a 16-bit data bus to control the acquisition and tracking processes using the various registers on the chip. 90 61 91 60 FEATURES GP1020 s Six Fully Independent Correlation Channels s Switchable to Receive GPS or GLONASS Codes s Input Multiplexer for Multiple GPS Front-Ends – Allows Antenna Diversity 120 31 s Input Multiplexer for GLONASS Multiple (Separate Channels) Front-Ends s Digital Interface Compatible with Most 16 or 32-Bit Microprocessors 1 30 GP120 Fig 1 Pin connections - top view s Fully Compatible with GP1010 GPS Receiver Front-End s Sideways Stackable to give Multiples of Six Channels s 120-pin Plastic Quad Flatpack s Power Dissipation Less Than 500mW APPLICATIONS ABSOLUTE MAXIMUM RATINGS These are not the operating conditions, but are the absolute limits which if exceeded, even momentarily, may cause permanent damage. To ensure sustained correct operation the device should be used within the limits given u...