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PDF RF8000 Data sheet ( Hoja de datos )
| Número de pieza | RF8000 | |
| Descripción | Global Positioning System Receiver | |
| Fabricantes | RF Micro Devices | |
| Logotipo |  |
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14
Typical Applications
• Automotive Navigation
• Asset Tracking
• Fleet Management
RF8000
GLOBAL POSITIONING SYSTEM RECEIVER
• Telematics
• Marine Navigation
Product Description
The RFMD Global Positioning System (GPS) Receiver is
a plug-n-play module designed for OEM use. The 12-par-
allel-channel GPS receiver works in a wide variety of end
products including: marine navigation, telematics, auto-
motive navigation, and asset tracking. The GPS receiver
processes signals from all the visible GPS satellites
broadcasting RF navigation information. “All-in-view” sat-
ellite tracking produces highly accurate, smoothed navi-
gation data. The data is relatively immune to the position
jumps that occur when fewer satellites are monitored.
Designed to withstand harsh industrial environments, the
GPS receiver performs robustly in situations where
extreme vehicle movement or high signal blockage are
concerns (such as dense urban areas).
Optimum Technology Matching® Applied
Si BJT
Si Bi-CMOS
GaAs HBT
GaAs MESFET
! !SiGe HBT
Si CMOS
GaInP/HBT
GaN HEMT
SiGe Bi-CMOS
GPS Antenna
(30 dB Gain, 20 MHz BW)
L1 BP Filter
LNA
RTC Crystal
(32 kHz)
Temp.
Sensor
Filter
RTC
Gain
ADC
GPS Crystal
(43 kHz)
Low Noise Amplifier
Osc.
RF ASIC
Digital ASIC
FLASH
Digital
ASIC
Supervisor
+2.5 V
Reg.
I/O
Connector
1. +3.3 V
2. GND
3. TX1
4. RX1
5. T-Mark
6. V_Antenna
7. +2.5 V Battery
8. RX2
Functional Block Diagram
Package Style: 38mmx38mm
Features
• Fast satellite time-to-first-fix (TTFF) with
a Rapid Acquisition Module
• Small footprint: 38mmx38mm
• Supports 3D and 2D navigation modes
• Automatic cold start acquisition process
14
Ordering Information
RF8000
RF8001
DK8000
Global Positioning System Receiver
GPS Receiver with Right Angle Connector
Global Positioning System Receiver Evaluation Kit
RF Micro Devices, Inc.
7628 Thorndike Road
Greensboro, NC 27409, USA
Tel (336) 664 1233
Fax (336) 664 0454
http:w//wwwww.D.rfamtda.Scohmeet4U.com
Rev A3 020603
www.DataSheet4U.com
www.DataSheet4U.com
14-1
1 page  
RF8000
Theory of Operation
The RFMD GPS receiver is a single-board, 12 parallel-channel engine designed for OEM use. The GPS receiver pro-
cesses signals from the visible GPS satellites broadcasting RF navigation information. “All-in-view” satellite tracking pro-
duces highly accurate, smoothed navigation data. The data is relatively immune to the position jumps that occur when
fewer satellites are monitored. Designed to withstand harsh industrial environments, the GPS receiver performs robustly
in situation (such as dense urban areas) where extreme vehicle movement or high signal blockage are concerns.
When fewer than four satellites are available or when operating conditions require, the GPS receiver supports 2D navi-
gation. To calculate a fix while in 2D navigation mode, the receiver uses either the last altitude determined while in 3D
navigation mode, or data supplied by the user.
Satellite acquisition can be obtained under most initialization situations, as long as the receiver can “see” the satellites.
Rapid time to first fix (TTFF) is a feature of the Rapid Search Engine. The flexible satellite acquisition system takes
advantage of all available information to provide rapid TTFF, even without user initialization. To minimize TTFF when pri-
mary power is removed from the receiver, a DC supply voltage maintains the real time clock (RTC). This allows the GPS
receiver to use the prior position data and satellite information stored in the GPS receiver’s flash memory.
The receiver has two independent, asynchronous serial input/output ports. The receiver’s primary serial port outputs
navigation data and accepts commands in the NMEA-0183 or binary message formats. The receiver’s secondary serial
port accepts differential GPS (DGPS) corrections in RTCM SC-104 format. See the “Message Definitions” section for
more information.
Receiver Architecture
The GPS receiver chipset includes all the radio frequency (RF) direct sampling and amplification circuitry. These circuits
present both the sign and magnitude of sampled data to the digital ASIC. The digital ASIC contains an integral micropro-
cessor (PowerPCR401), the GPS signal processing, SRAM, and the RTC. Memory and other supporting components
are needed to make a complete navigation system.
Receiver Operation
The receiver requires 3.3V DC primary input power.
The receiver’s antenna must have visibility of the sky in order to acquire enough satellites to produce a navigation solu-
tion. While this is usually not a problem outdoors, operation indoors or in a vehicle may require that the antenna be
located with an unobstructed view of the sky. If the satellites are blocked from the receiver’s antenna, the receiver will
take longer to acquire a position. If fewer than four satellites are available, the receiver may be able to determine a valid
2D position solution by using altitude aiding.
Signal Acquisition Modes
The GPS receiver supports the following four signal acquisition modes, depending on the availability of critical data.
Cold Start
Warm Start
Hot Start
Reacquisition
In this mode, the receiver has valid almanac and frequency standard parameters available in memory.
The receiver enters this mode on start-up when battery back-up power is not maintained.
In this mode, the receiver has the following valid data either available in memory or provided by the
user at initialization: position, time, almanac, and frequency standard parameters. The receiver enters
this mode on start-up when battery back-up power is maintained.
In this mode, the receiver has the following valid data available in memory: position, velocity, time,
ephemeris, almanac, and frequency standard parameters. The receiver enters this mode following a
software reset or short power-off cycle when battery back-up power is maintained.
In this mode, the receiver has experienced a signal blockage for a short period of time (less than
10seconds) that was preceded by a period of continuous navigation.
14
Rev A3 020603
14-5
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| PDF Descargar | [ Datasheet RF8000.PDF ] | |
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