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 down-
converter 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 independ-
ent 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
GP
1020
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 perma-
nent damage. To ensure sustained correct operation the device
should be used within the limits given under Electrical Character-
istics.
Supply voltage (V
DD
) from ground (V
SS
):
20·3V
to16·0 V
Input voltage (any input pin):
V
SS
20·3V
to V
DD
10·3
V
Output voltage (any output pin):
V
SS
20·3V
to V
DD
10·3
V
Storage temperature:
255°C
to
1125°C
s
GPS or GLONASS Navigation Systems
s
High Integrity Combined Receivers
s
GPS Geodetic Receivers
s
GPS Time Reference
ORDERING INFORMATION
The GP1020 is available in 120-pin Quad Flatpacks (Gullwing
formed leads) in both Commercial (0°C to
170°C)
and Industrial
(240°C to
185°C)
grades. The ordering codes below are for
standard screened devices.
RELATED PRODUCTS
Part
Description
Datasheet
Reference
DS3861
DS3076
ORDERING CODES
GP1020 CG GPKR
Commercial - Plastic 120-pin QFP (GP120)
GP1020 IG GPKR
Industrial - Plastic 120-pin QFP (GP120)
DW9255 35·42MHz SAW Filter
GP1010
GPS Receiver Front-End
ZARLINK [ ZARLINK SEMICONDUCTOR INC ]
