Part # LMX2604 datasheet

Part Manufacturer: National Semiconductor

National Semiconductor

Part Description: LMX2604 Triple-band VCO for GSM900 DCS1800 PCS1900

Part Details:

LMX2604 January 2004 LMX2604 Triple-band Triple-band VCO for GSM900/DCS1800/PCS1900General Description Features The LMX2604 is a fully integrated VCO (Voltage-Controlled n On-chip Triple-band RF VCOs Oscillator) IC designed for GSM900/DCS1800/PCS1900 GSM: 880 MHz to 915 MHz triple-band application. The IC is ideal for use in the trans- DCS: 1710 MHz to 1785 MHz VCO mitter modulation loop by providing extremely small form PCS: 1850 MHz to 1910 MHz factor and low phase noise. The IC has two VCOs, one for n On-chip tank circuit GSM and a second for DCS/PCS. The IC has two separate n Low phase noise buffer amplifiers to drive an external high power amplifier, -- -167 dBc/Hz @ 20 MHz offset in GSM band for one for GSM900 band and the other one for DCS1800/ -- -163 dBc/Hz @ 20 MHz offset in DCS band PCS1900 bands. The IC also has a differential buffer ampli- -- -162 dBc/Hz @ 20 MHz offset in PCS band GSM900/DCS1800/PCS1900 fier to drive a mixer for the offset PLL. n High output power The resonant circuits of the VCOs are fully integrated in the -- +6 dBm in GSM mode chip to ease the application of the IC. The high quality factor -- +6 dBm in DCS and PCS mode of the embedded tank circuit achieves very low phase noise n Low current consumption characteristics at the VCO output. The only required external -- 18 mA in GSM mode components are a couple of supply bypass capacitors and -- 15 mA in DCS and PCS mode matching components. n +2.6 V to +3.0 V supply voltage A control pin for controlling the oscillation frequency is n 0.25 µm RF CMOS process shared by the two VCOs. n Small 20-pin 4x4 LLP package The LMX2604 IC is provided in a 20-pin 4x4 LLP (LeadlessLeadframe package). Applicationsn Transmit VCO for GSM, DCS, and PCS n Closed loop modulation systems Functional Block Diagram 20066101 FastLockTM is a trademark of National Semiconductor Corporation.TRI-STATE® is a registered trademark of National Semiconductor Corporation. © 2004 National Semiconductor Corporation DS200661

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LMX2604.pdf Datasheet