lmx2485芯片手册.pdf

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lmx2485英文版芯片手册,The LMX2485 device is a low power, high performance delta-sigma fractional-N Pll with an auxiliary integer-N pll. The device is fabricated using Texcas instruments advanced process.
lEXAS INSTRUMENTS LMX2485, LMX2485E yww,ti. com SNAS236G-OCTOBER 2005-REVISED JANUARY 2016 5 Pin Configuration and Functions RTW Package 24-Pin WQFN Top view GND 2 17VddIF2 VddRF1[3: 16 CPoutIF (Ground Substrate 15 GND FinRF 5 14|Vd|F1 LEI 6 13 FinIF Pin Functions PIN DESCRIPTION NO NAME 0 GND Ground substrate; this is on the bottom of the package and must be grounded CPoutRF RF PLL charge pump output GND RF PLL analog ground VddRF1 RF PLL analog power supply FinRF RF PLL high-frequency input pin 5 Fine RF PLL complementary high-frequency input pin; shunt to ground with a 100-pF capacitor 6 LE MICROWIRE load enable: high-impedance CMOS input Data stored in the shift registers is loaded nto the internal latches when LE goes HIGH DATA MICROWiRE data; high-impedance binary serial data input CLK MICROWIRE clock; high-impedance CMOS Clock input Data for the various counters is clocked into the 24-bit shift register on the rising edge VddrF2 Power supply for RF PLL digital circuitry 10 CE Chip Enable control pin; must be pulled high for normal operation VddRF5 Power supply for RF PLL circuitry 12 FtestLD Test frequency output /lock detect 13 Fine IF PLL high-frequency input pi DdfL IF PLL analog power supply 15 GND IF PLL digital ground 16 CPoutIF o IF PLL charge pump output 17 VddlF2 IF PLL power supply SCOut Buffered output of the os Cin signal 19 ENOSC Oscillator enable: when this is set to high, the OSCout pin is enabled regardless of the state of other pins or register bits OSCin nput for TCXO signal 21 NC This pin must be left oper VddrF3 Power supply for RF PLL digital circuitry FLoutRF RF PLL fastlock output; also functions as programmable TRI-STATE CMOS output 24 ∨ddRF4 RF PLL analog power supply Copyright C 2005-2016, Texas Instruments Incorporated Submit documentation Feedback Product folder links: LMX2485 LMX2485E EXAS INSTRUMENTS LMX2485 LMX2485E SNAS236G-OCTOBER 2005-REVISED JANUARY 2016 www.ti.com 6 Specifications 6.1 Absolute Maximum Ratings over operating free-air temperature range(unless otherwise noted )(1)(2) MIN MAX UNIT Power supply voltage 0.3 4.25 Voltage on any pin with GND=0 V -0.3 Vcc +0.3 V Lead temperature( Solder 4 sec. tg Storage temperature 65 150 C (1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability (2)For ensured specifications and test conditions, see the Electrical Characteristics. The ensured specifications apply only for the test conditions listed. The voltage at all the power supply pins of vddRF1, vddRF2, vddRF3, VddRF4, VddRF5, vddiFl and vddiF2 must be the same Vcc will be used to refer to the voltage at these pins and icc will be used to refer to the sum of all currents through all these power pins 6.2 ESD Ratings VALUE UNIT uman- body model(HBM) ±2000 Electrostatic discharge Charged-device model(CDM) Machine model(MM) ±200 (1)This is a high performance RF device is ESD-sensitive Handling and assembly of this device should be done at an ESd free workstation 6.3 Recommended operating conditions over operating free-air temperature range(unless otherwise noted) MIN NOM MAX UNIT Power supply voltage 1) 2.5 3.6 Operating temperature 40 25 °C (1)Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Recommended Operating Conditions indicate conditions for which the device is intended to be functional, but does not ensure specific performance limits For ensured specifications and test conditions, see the Electrical Characteristics. The ensured specifications apply only for the test conditions listed. The voltage at all the power supply pins of VddRF1, VddRF2, VddRF3, VddRF4, VddRF5, VddIF1 and VddIF2 must be the same. Vcc will be used to refer to the voltage at these pins and Icc will be used to refer to the sum of all currents through all these power pins 6.4 Thermal Information LMX2485, LMX2485E THERMAL METRIC( UNIT RTW(WQFN) 24 PINS Junction-to-ambient thermal resistance 47.2 Reucttop) Junction-to-case(top)thermal resistance 43 °C eJB Junction-to-board thermal resistance 24 Junction-to-top characterization parameter 0.8 B Junction-to-board characterization parameter Junction-to-case(bottom) thermal resistance °c (1)For more information about traditional and new thermal metrics, see the Semiconductor and /C Package Thermal Metrics application eport SPRA953 Submit documentation feedback Copyright o 2005-2016, Texas Instruments Incorporated Product folder links: LMX2485 LMX2485E lEXAS INSTRUMENTS LMX2485, LMX2485E yww,ti. com SNAS236G-OCTOBER 2005-REVISED JANUARY 2016 6. 5 Electrical characteristics Vcc=3.0V;-0°c≤TAs+85° unless otherwise specified) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT IcC PARAMETERS Power supply current, IF PLL OFF RF synthesize RF PLL ON 3.3 mA Charge Pump TRI-STATE IF PLL ON IcclF Power supply current, RE PLL OFF 7 IF synthesizer mA Charge pump tRI-STATE Power supply current, entire IF PLL ON ICC TOTAL synthesizer RE PLL ON 5 Charge Pump TRI-STATE PD Powerdown current CE=ENOSC=0V 10 A CLK DATA LE=0V RF SYNTHESIZER PARAMETERS RF P=8 500 2000 LMX2485 Operati RF P=16 500 3000 MHz 8 2000 LMX2485E RE P=16 3000 500-3000MH -15 FinE Input sensitivity dBm 50-500 MHZ (LMX2485E only) Phase detector frequency(2, 50 MHz RE CPG=O Vrc2 HA RF charge pump source RF CPG= 1 srce V~c/2 190 A RE CPG= 15 1520 Vccl2 HA RE CPG=0 95 A CPoutRF ICPOutRF SINK RF charge pump sink current(3)RF_CPG=1 190 A CPoutRF RF CPG=15 1520 Vcpoutre Vcc/2 HA ICPOUtRF TRI RF charge pump TRI-STATE05 sVCPOuRFSVcc-05 10 nA current magnitude 2 I ICPoutRF %MIS I Magnitude of RF CP sink vs. cPcPoutRF=Vcc/2 RF CPG>2 3% 10% source mismatch TA=25°C RF CPG≤2 13% I IcpoutRe%VI Magnitude of RF CP current Vs. 0.5 sVCPoutRF sVcc-05 2% CP voltage TA=25°C 8% I ICPoutRF%T I Magnitude of RF CP current Vs temperature CPoutRE Vcc/2 4% IF SYNTHESIZER PARAMETERS Operating frequency 75 800MHz IF input sensitivity 5 OMP Phase detector frequency 10 MHz ICPOULIF SRCE IF charge pump source current VcPoutIF=Vcc/2 3.5 CPoutIF SINK F charge pump sink current VcPoutlF=Vcc/2 35 mA cpoutIeTRI charge pump TRI-STA忙E current magnitude 0.5 s VCpoutIF s Vcc RF-05 2 10 DA (1)a slew rate of at least 100 V/us is recommended for frequencies less than 500 MHz for optimal performance (2) For Phase Detector Frequencies greater than 20 MHz, Cycle Slip Reduction(CSR)may be required. Legal divide ratios are also required (3)Refer to table in RF CPG-RF PLL Charge Pump Gain for complete listing of charge pump currents Copyright C 2005-2016, Texas Instruments Incorporated Submit documentation Feedback Product folder links: LMX2485 LMX2485E EXAS INSTRUMENTS LMX2485 LMX2485E SNAS236G-OCTOBER 2005-REVISED JANUARY 2016 www.ti.com Electrical Characteristics(continued) cc=30V;40°C≤Tas+85° unless otherwise specified) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT I ICPoutIF %MIS I Magnitude of IF CP sink vs CP VcPoutIF=Vcc/2 source mismatch 1% 8% ICPoutIF%VI Magnitude of IF CP current Vs 0.5 s VcPoutIF S Vcc-05 CP voltage TA=25°c 4% 10% I IcPoutIF %TEMP Magnitude of IF CP current Vs VcPoutF=Vcc/2 4% temperature OSCILLATOR PARAMETERS OSCZX=0 110MHz Oscillator operating frequency OSC2X= 1 5 20MHz Oscillator input sensitivity 0.5 Vp OScin Oscillator input current -100 100 A SPURS Spurs in band See (4) d Bc PHASE NOISE RF CPG=O 202 RE CPG= 1 LF1HZRF RF synthesizer normalized phase noise contribution 5) RF CPG=3 dBc/Hz RF CPG=7 -208 RF CPG=15 210 -FlH7IF iF synthesizer normalized phase 209 dBc/hz noise contribution DIGITAL INTERFACE (DATA, CLK, LE, ENOSC, CE, Ftest/LD, FLoutRF) High-level input voltage 1.6 Low-level input voltage 0.4 High-level input current LOW-level input current Vu=0V 1≠A High-level output voltage 500μA Vcc.4 LOW-level output voltage loL=500μA 04 (4) To measure the in-band spur, the fractional word is chosen such that when reduced to lowest terms, the fractional numerator is one The spur offset frequency is chosen to be the comparison frequency divided by the reduced fractional denominator. The loop bandwidth must be sufficiently wide to negate the impact of the loop filter Measurement conditions are: Spur Offset Frequency =10 kHz, Loop Bandwidth 100 kHz, Fraction 1/2000, Comparison Frequency =20 MHz, RF CPG=7, DITH=0, and a 4th Order Modulator(FM= 0). These are relatively consistent over tuning range (5)Normalized Phase Noise Contribution is defined as: LN(f)=L(f)-20log(N)-10logfcoMP)where L(f) is defined as the single side band hase noise measured at an offset frequency, f, in a 1 Hz Bandwidth The offset frequency, f must be chosen sufficiently smaller than the PLL loop bandwidth, yet large enough to avoid substantial phase noise contribution from the reference source. Measurement conditions are: Offset Frequency =11 kHz, Loop Bandwidth= 100 kHz for RF CPG=7, Fraction = 1/2000, Comparison Frequency 20 MHz FM=0. DITH=0 Submit documentation Feedback Copyright o 2005-2016, Texas Instruments Incorporated Product folder links: LMX2485 LMX2485E lEXAS INSTRUMENTS LMX2485, LMX2485E yww,ti. com SNAS236G-OCTOBER 2005-REVISED JANUARY 2016 6.6 Timing Requirements MIN NOM MAXUNIT MICROWIRE INTERFACE TIMING CS Data to clock set-up time See Figure 1 25 ns Data to clock hold time See Figure 1 ns CWH Clock pulse width high See Figure 1 Clock pulse width low See Figure 1 Clock to load enable set-up time See Figure 1 ns Load enable pulse width See Figure 1 ns LSB DATA D19 D18 D17D D15 DO C3 C1 几几∏几几几m tcy Figure 1. Microwire Input Timing Diagram 6.7 Typical Characteristics Typical characteristics do not imply any sort of ensured specification Ensured specifications are in the Electrical Characteristics section 6.7.1 Sensitivity Vcc-2.5v.3.0V ad 3.6V TA=25°C,and85°c TA=4CC TA=85°C Voc=3.0 Voc=2.5V TA=-40° Ta=25c 50 3000 10c0 TA=25°C,RFP=16 VcC =3V, RF P=16 Figure 2. RF PLL Fin Sensitivity Figure 3. RF PLL Fin Sensitivity Copyright C 2005-2016, Texas Instruments Incorporated Submit documentation Feedback Product folder links: LMX2485 LMX2485E EXAS INSTRUMENTS LMX2485 LMX2485E SNAS236G-OCTOBER 2005-REVISED JANUARY 2016 www.ti.com Sensitivity (continued) Vcc=3.0V 一TA=-∠0°c,25Cand85°C 0 VcC=5.0 0TA=25°C Vac=2.5V fFinIF(MHz) TA=25C,P=16 cc=3V,IF_P=16 Figure 4.IF PLL Fin Sensitivity Figure 5. IF PLL Fin Sensitivity TA=25C fascin(MHz TA=25°C,OSC_2X=0 c=3V, OSc 2X=0 Figure 6. oScin Sensitivity Figure 7. OSCin Sensitivity cc=25V,3 TA".40C, 25C, and 85C TA=25C, OSC 2X= 1 Vcc=3V, OSC_2X=1 Figure 8. OSCin Sensitivity Fiqure 9. oscin Sensitivit Submit documentation feedback Copyright o 2005-2016, Texas Instruments Incorporated Product folder links: LMX2485 LMX2485E lEXAS INSTRUMENTS LMX2485, LMX2485E yww,ti. com SNAS236G-OCTOBER 2005-REVISED JANUARY 2016 6.7.2 FinRF Input Impedance 50 MHz Marker 2 1.0 Hz Marker 3: 2.0 GHz arker 3.0 GHz Start 1.0 GHz Stop 3.5 GH Figure 10. FinRF Input Impedance Table 1. FinRF Input Impedance FREQUENCY(MHz REAL (Q IMAGINARY 50 670 -276 100 531 200 452 209 300 408 212 373 600 302 237 700 270 239 800 900 215 231 1000 192 1100 172 218 1200 1300 139 200 1400 127 -192 1500 114 184 1600 104 1700 168 1800 88 160 1900 2000 74 2200 -134 56 123 2600 113 3000 39 3200 37 3400 78 3600 -72 3800 69 4000 26 66 Copyright C 2005-2016, Texas Instruments Incorporated Submit documentation Feedback Product folder links: LMX2485 LMX2485E EXAS INSTRUMENTS LMX2485 LMX2485E SNAS236G-OCTOBER 2005-REVISED JANUARY 2016 www.ti.com 6.7.3 FinIF Input Impedance 人 Marker 2 MHz Start 50 MHz Stop 1000 MHz Figure 11. FinIF Input Impedance Table 2.IF PLL Input Impedance FinIF INPUT IMPEDANCE FREQUENCY(MHZ) REAL (Q) lAGINARY(Q) 583 75 530 256 100 499 -241 200 426 209 300 347 500 310 224 600 276 228 700 244 800 216 223 900 192 218 1000 173 208 Submit documentation Feedback Copyright o 2005-2016, Texas Instruments Incorporated Product folder links: LMX2485 LMX2485E

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