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| STB5610 GPS RF FRONT-END IC PRELIMINARY DATA * ONE CHIP SYSTEM TO INTERFACE GPS ANTENNA TO GPS MICRO CONTROLLER * ABLE TO SUPPORT ACTIVE AND PASSIVE ANTENNA * MINIMUM EXTERNAL COMPONENTS * COMPATIBLE WITH GPS L1 SPS SIGNAL AND GALILEO FREQUENCIES * CMOS OUTPUT LEVELS * 2.7 V .. 3.6 V SUPPLY VOLTAGE * EMBEDDED LOW PHASE NOISE PLL * ACTIVE ANTENNA SENSOR * SMART CHIP ENABLE FUNCTION FOR POWER CONSUMPTION OPTIMIZATION * ESD PROTECTED DESCRIPTION The STB5610, using ST Microelectronics RF Bipolar technology, implements a Global Positioning System RF front-end. The chip provides down conversion from the 1575.42 MHz GPS (L1) signal to 4.092 MHz Output signal. The integrated PLL with on-chip reference oscillator uses a low cost 16.368 MHz crystal. No TCXO is required. PIN CONNECTION Gnd_XTAL TQFP48 ORDER CODE STB5610 BRANDING STB5610 XTAL_out Gnd_XTAL XTAL_in Gnd_IF Gnd_IF Vcc_IF IF2+ Fselect IF2- 48 Vcc_XTAL Vcc_Logic LF Vcc_VCO Gnd TNK1 TNK2 Gnd Gnd IF1+ IF1Gnd 1 2 3 4 5 6 7 8 9 10 11 12 13 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 Vcc_Logic2 Gnd DATA CLK Gnd_Driver Vcc_Driver Gnd_Loic Vcc_Logic AS1 AS2 As_out GC 14 RF+ 15 16 17 Vcc_RF 18 19 LNA_out- 20 Vcc_LNA 21 Gnd 22 23 LNA_in- May, 7 2002 CE2 24 Gnd CE Gnd_RF LNA_in+ LNA_out+ Gnd_RF RF- 1/11 STB5610 PIN CONFIGURATION PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Symbol Vcc_XTAL Vcc_Logic LF Vcc_VCO Gnd TNK1 TNK2 Gnd Gnd IF1+ IF1Gnd Gnd_RF RF+ RFGnd_RF Vcc_ RF LNA_Out+ LNA_OutVcc_LNA Gnd_LNA LNA_in+ LNA_inGnd_LNA Typ. DC Bias Description Power supply Power supply Loop filter Power supply Ground Tank Input Tank Input Ground Ground Mixer Output Mixer Output Ground Ground RF amp. input RF amp. input Ground Power supply LNA output LNA output Power supply Ground LNA input LNA input Ground External Circuit 2/11 STB5610 PIN CONFIGURATION PIN 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 Symbol GC AS_Out AS2 AS1 Vcc_Logic Gnd_Logic Vcc_Driver Gnd_Driver CLK DATA Gnd Vcc_Logic2 CE2 CE Fselect Gnd_IF IF2IF2+ Gnd_IF Vcc_IF Gnd_XTAL XTAL_in XTAL_out Gnd_XTAL Typ. DC Bias Description LNA Gain control Antenna sensor output Antenna sensor input Vcc Antenna Supply Power supply Ground Supply Voltage Ground Clock Data Ground Supply Voltage Chip Enable (no data) Chip Enable Frequency Selector Ground Lim. Amp. Output Lim. Amp. Output Ground Supply Voltage Ground Crystal Input Crystal Output Ground External Circuit 3/11 STB5610 BLOCK DIAGRAM (GPS L1) SAW Filter Passive Antenna LC Filter LC Filter Two gain LNA 1.57 GHz RF Amp. Mixer 1ST Lim. amp. 2ND Lim. amp. D Latch Output buffer D CK Q 4 MHz Data @ 4 MHz CMOS levels Gain Select. 1.55 GHz 20 MHz 20 MHz PLL 16.368 MHz Quartz ~ VCO CLK @ 16MHz CMOS levels 16 MHz Loop Freq. Filter select CE ExternalTank ASout CE2 FUNCTIONAL DESCRIPTION LNA section The RF input signal is amplified by two gain levels LNA. Using gain control pin the LNA gain is set to 19 dB to support passive antenna or 10 dB to support active antenna. The LNA output signal is filtered by 1575.42 MHz SAW filter. RF Amplifier plus mixer section The 1575.42 MHz input signal, amplified by RF amp., is mixed with the VCO signal to generate a differential 20.46MHz IF signal IF section Two LC filters at mixer output and at first limiting output are used to suppress undesirable signals and mixer products. The second stage limiting amplifier is connected to a D-Type latch clocked by 16.368MHz crystal oscillator signal. The effect of sampling the 20.46MHz signal at 16.368MHz is to create sub-sampling alias at 4.092MHz. This is fed to the output level converter. Output section The output buffers perform level translation from the internal ECL levels to CMOS output levels referred to ground. The Data signal changes during the clock signal negative edge. Power supplies The STB5610, has been designed to support from 2.7 V to 3.6 V supply voltage. VCO and PLL Using external tank the VCO is able to provide very low phase noise signal. Through the freq. selector pin the VCO signal is set at 1554.96 MHz and at 1571.328 MHz. The on-chip reference oscillator uses a low cost 16.368 MHz crystal. Antenna sensor circuitry Integrated sensor circuitry is able to evaluate the antenna current consumption; the Asout pin output provides this info externally. Using external sensing resistor of 10 Ohm if the antenna current consumption is inside the range 10mA...40mA (active antennas typical current consumption) the Asout output logic level is High, if the antenna current consumption is outside the above reported range (passive antenna or problem on antenna connection) the Asout output logic level is low. Chip enable Using the CE pin it is possible to switch off all the chip ( neither data nor clock available). Using CE2 pin it is possible to disable the analog portion of the chip (no data available) maintaining the digital portion active (Clock available) optimizing the chip current consumption. 4/11 STB5610 ABSOLUTE MAXIMUM RATING Symbol Vcc Tj Supply voltage Junction operating temperature Parameter Value 5.9 -40 to 125 Unit V o C THERMAL DATA Symbol Rthj-case Parameter Thermal resistance junction-case Value TBD Unit o C/W ELECTRICAL CHARACTERISTICS (Vcc = 3+/-10%, Tcase= 25 oC) Symbol Parameter Test conditions Min. Typ. Max. Unit SUPPLY Vcc Icc AS1 Supply voltage Supply current Vcc Antenna Supply 2.7 2.7 3.3 37 3.3 / 5 5.5 3.6 V mA V LNA Gp NF IIP3 VSWRin Power gain Noise figure Input IP3 Voltage Stat. Wave Ratio Pin GC at GND Pin GC at Vcc Pin GC at GND Pin GC at Vcc Pin GC at GND Pin GC at Vcc ZL=50 19 10 3 10 -20 -5 2.1 dB dB dBm RF AMPLIFIER AND MIXER CHAIN IIP3 NF ZIN ZOUT fRF G Input IP3 Noise Figure Input impedance Differential output impedance Input signal RF Voltage Convertion Gain -19 5.5 50 1.4 1.575 30 dBm dB MHz dB FIRST LIMITING AMPLIFIER G ZOUT Voltage Gain Differential output impedance 60 2.4 dB 5/11 STB5610 ELECTRICAL CHARACTERISTICS (Vcc = 3+/-10%, Tcase= 25 oC) Symbol Parameter Test conditions Min. Typ. Max. Unit SECOND LIMITING AMPLIFIER G Voltage Gain 30 dB VCO (GPS LO frequency 1555MHz) VCO Phase noise f = 1KHz, SSB (10KHz PLL closed loop bandwith) -60 dBc/Hz OUTPUT BUFFER (square wave CMOS level) VOH VOL High output voltage Low output voltage Vcc-0.4 0 Vcc 0+0.4 V V PHASE LOCKED LOOP XTAL Reference crystal 16.368 MHz INPUT CONTROL PINS TABLE (The logic levels are TTL compatible) GC Pin (lna gain control pin) Logic level Low High CE Pin (Total chip enable pin) Value Max Gain Min Gain Logic level Low High Value Switch-off Switch-on CE2 Pin (Analog portion enable pin) Logic level Low High FSELECT (Frequencies Selector Pin) Logic level Low High Value Switch-off Switch-on Value GPS frequency Galileo frequency OUTPUT CONTROL PINS TABLE The Asout pin output provides information on Antenna current consumption ASout Pin (Antenna sensor pin)* Logic level Low** High** Value Iant<10mA Iant.>40mA 10mA 6/11 STB5610 APPLICATION BOARD SCHEMATIC (ACTIVE ANTENNA) AV AI LA BL E O N RE Q UE ST 7/11 STB5610 APPLICATION BOARD LAYOUT (ACTIVE ANTENNA) 8/11 AV AI LA BL E O N RE Q UE ST STB5610 BILL OF MATERIALS AV AI LA BL E O N RE Q UE ST 9/11 STB5610 MECHANICAL DATA mm DIM. A A1 A2 D D1 E E1 L e b ccc ddd TETA MIN. TYP. MAX 1.60 0.05 1.35 8.75 6.9 8.75 6.9 0.5 1.40 9.00 7.00 9.00 7.00 0.60 0.5 0.17 0.22 0.15 1.45 9.25 7.1 9.25 7.1 0.75 0.27 0.08 0.08 0o 7o Note: L is measured at gage plane (at 0.25 above the seating plane) 10/11 STB5610 Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is registered trademark of STMicroelectronics (R) 2002 STMicroelectronics - All Rights Reserved All other names are the property of their respective owners. STMicroelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - U.S.A. http://www.st.com 11/11 |
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