PDF LMX2377U Data sheet ( Hoja de datos )

Número de pieza	LMX2377U
Descripción	PLLatinum Ultra Low Power Dual Frequency Synthesizer for RF Personal Communications
Fabricantes	National Semiconductor
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No Preview Available ! November 2002 LMX2377U PLLatinum™ Ultra Low Power Dual Frequency Synthesizer for RF Personal Communications 2.5 GHz/1.2 GHz General Description The LMX2377U device is a high performance frequency synthesizer with integrated dual modulus prescalers. The LMX2377U device is designed for use as a local oscillator for the first and second RF of a dual conversion radio trans- ceiver. A 16/17 or a 32/33 prescale ratio can be selected for the Main synthesizer. An 8/9 or a 16/17 prescale ratio can be selected for the Aux synthesizer. Using a proprietary digital phase lock technique, the LMX2377U device generates very stable, low noise control signals for UHF and VHF voltage controlled oscillators. Both the Main and Aux synthesizers include a two-level programmable charge pump. The Main synthesizer has dedicated Fastlock circuitry. Serial data is transferred to the devices via a three-wire interface (Data, LE, Clock). The low voltage logic interface allows connection to 1.8V devices. Supply voltages from 2.7V to 5.5V are supported. The LMX2377U features ultra low current consumption, typically 3.5 mA at 3.0V. The LMX2377U devices are available in 20-Pin TSSOP, 24-Pin CSP, and 20-Pin UTCSP surface mount plastic pack- ages. Features n Ultra Low Current Consumption n Upgrade and Compatible to the LMX2370 n 2.7V to 5.5V Operation n 1.8V to 5.0V MICROWIRE Logic Interface n Selectable Synchronous or Asynchronous Powerdown Mode: ICC-PWDN = 1 µA typical n Selectable Dual Modulus Prescaler: Main: 16/17 or 32/33 Aux: 8/9 or 16/17 n Selectable Charge Pump TRI-STATE® Mode n Programmable Charge Pump Current Levels Main and Aux: 0.95 or 3.8 mA n Selectable Fastlock™ Mode for the Main Synthesizer n Open Drain Analog Lock Detect Output n Available in 20-Pin TSSOP, 24-Pin CSP, and 20-Pin UTCSP Applications n Mobile Handsets (GSM, GPRS, W-CDMA, CDMA, PCS, AMPS, PDC, DCS) n Cordless Handsets (DECT, DCT) n Wireless Data n Cable TV Tuners Thin Shrink Small Outline Package (MTC20) Chip Scale Package (SLB24A) Ultra Thin Chip Scale Package (SLE20A) 20022680 20022681 20022695 PLLatinum™ is a trademark of National Semiconductor Corporation. © 2002 National Semiconductor Corporation DS200226 www.national.com 1 page Ordering Information Model LMX2377USLEX Temperature Range −40˚C to +85˚C LMX2377USLBX LMX2377UTM −40˚C to +85˚C −40˚C to +85˚C LMX2377UTMX −40˚C to +85˚C Package Description Ultra Thin Chip Scale Package (UTCSP) Tape and Reel Chip Scale Package (CSP) Tape and Reel Thin Shrink Small Outline Package (TSSOP) Thin Shrink Small Outline Package (TSSOP) Tape and Reel Packing 2500 Units Per Reel 2500 Units Per Reel 73 Units Per Rail 2500 Units Per Reel NS Package Number SLE20A SLB24A MTC20 MTC20 5 www.national.com 5 Page Electrical Characteristics (Continued) VCC = VP Main = VP Aux = Vµc = 3.0V, −40˚C ≤ TA ≤ +85˚C, unless otherwise specified Symbol Parameter Conditions PHASE NOISE CHARACTERISTICS LN(f) Main Main Synthesizer Normalized Phase Noise Contribution (Note 10) L(f) Main Main Synthesizer Single Side Band Phase Noise Measured LN(f) Aux L(f) Aux Aux Synthesizer Normalized Phase Noise Contribution (Note 10) Aux Synthesizer Single Side Band Phase Noise Measured TCXO Reference Source IDo Main Bit = 1 fIN Main = 2450 MHz f = 1 kHz Offset FφMain = 200 kHz Loop Bandwidth = 7.5 kHz N = 12250 FOSC = 10 MHz VOSC = 0.632 VPP IDo Main Bit = 1 PWDN Aux Bit = 1 TA = 25˚C (Note 11) TCXO Reference Source IDo Aux Bit = 1 fIN Aux = 900 MHz f = 1 kHz Offset FφAux = 200 kHz Loop Bandwidth = 12 kHz N = 4500 FOSC = 10 MHz VOSC = 0.632 VPP IDo Aux Bit = 1 PWDN Main Bit = 1 TA = 25˚C (Note 11) Value Units Min Typ Max -212.0 dBc/ Hz -77.24 dBc/ Hz -212.0 -85.94 dBc/ Hz dBc/ Hz Note 4: Some of the values in this range are illegal divide ratios (B < A). To obtain continuous legal division, the Minimum Divide Ratio must be calculated. Use N ≥ P * (P−1), where P is the value of the prescaler selected. Note 5: Refer to the LMX2377U fIN Sensitivity Test Setup section Note 6: Refer to the LMX2377U Charge Pump Test Setup section Note 7: Refer to the Charge Pump Current Specification Definitions for details on how these measurements are made. Note 8: Refer to the LMX2377U OSCin Sensitivity Test Setup section Note 9: Refer to the LMX2377U Serial Data Input Timing section Note 10: Normalized Phase Noise Contribution is defined as : LN(f) = L(f) − 20 log (N) − 10 log (Fφ), where L(f) is defined as the single side band phase noise measured at an offset frequency, f, in a 1 Hz bandwidth. The offset frequency, f, must be chosen sufficiently smaller than the PLL’s loop bandwidth, yet large enough to avoid substantial phase noise contribution from the reference source. N is the value selected for the feedback divider and Fφ is the Main/Aux phase detector comparison frequency.. Note 11: The synthesizer phase noise is measured with the LMX2370TMEB/LMX2370SLBEB/LMX2370SLEEB Evaluation boards and the HP8566B Spectrum Analyzer. 11 www.national.com 11 Page

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