Part # LMX2377U datasheet

Part Manufacturer: National Semiconductor

National Semiconductor

Part Description: LMX2377U PLLatinum Ultra Low Power Dual Frequency Synthesizer for RF Personal Communications 2.5 GHz 1.2 GHz


Part Details:

Communications LMX2377U November 2002 LMX2377U PLLatinum PLLatinumTM Ultra Low Power Dual FrequencySynthesizer for RF Personal Communications2.5 GHz/1.2 GHzGeneral Description Features Ultra The LMX2377U device is a high performance frequency n Ultra Low Current Consumption synthesizer with integrated dual modulus prescalers. The n Upgrade and Compatible to the LMX2370 LMX2377U device is designed for use as a local oscillator for n 2.7V to 5.5V Operation the first and second RF of a dual conversion radio trans- Low n 1.8V to 5.0V MICROWIRE Logic Interface ceiver. n Selectable Synchronous or Asynchronous Powerdown A 16/17 or a 32/33 prescale ratio can be selected for the Mode: Main synthesizer. An 8/9 or a 16/17 prescale ratio can be I = 1 µA typical CC-PWDN Power selected for the Aux synthesizer. Using a proprietary digital n Selectable Dual Modulus Prescaler: phase lock technique, the LMX2377U device generates very Main: 16/17 or 32/33 stable, low noise control signals for UHF and VHF voltage Aux: 8/9 or 16/17 controlled oscillators. Both the Main and Aux synthesizers n Selectable Charge Pump TRI-STATE® Mode include a two-level programmable charge pump. The Main Dual n Programmable Charge Pump Current Levels synthesizer has dedicated Fastlock circuitry. Main and Aux: 0.95 or 3.8 mA Serial data is transferred to the devices via a three-wire n Selectable FastlockTM Mode for the Main Synthesizer interface (Data, LE, Clock). The low voltage logic interface n Open Drain Analog Lock Detect Output Frequency allows connection to 1.8V devices. Supply voltages from2.7V to 5.5V are supported. The LMX2377U features ultra n Available in 20-Pin TSSOP, 24-Pin CSP, and 20-Pin UTCSP low current consumption, typically 3.5 mA at 3.0V. The LMX2377U devices are available in 20-Pin TSSOP, Applications 24-Pin CSP, and 20-Pin UTCSP surface mount plastic pack-ages. n Mobile Handsets (GSM, GPRS, W-CDMA, CDMA, PCS, AMPS, PDC,DCS) Synthesizer n Cordless Handsets


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LMX2377U.pdf Datasheet