LMX2505

Small Size5.0 mm X 5.0 mm X 0.75 mm 28-Pin LLP Package
RF Synthesizer SystemTwo Integrated VCOsIntegrated Loop FilterLow Spurious, Low Phase Noise Fractional-N RF PLLBased on 10-Bit Delta SigmaModulatorFrequency Resolution Down to 20 kHz
Supports Various Reference Frequencies12.6/14.4/25.2/26.0 MHz
Fast Lock Time: 300 µs
Low Current Consumption10 mA at 2.8 V in PDC800 Mode
2.5 V to 3.3 V Operation
Digital Filtered Lock Detect Output
Hardware and Software Power Down Control

LMX2505 is a highly integrated, high performance, lowpower frequency synthesizer system optimized for dual-band Japan PDC mobile handsets. Using a proprietary digi-tal phase locked loop technique, LMX2505 generates verystable, low noise local oscillator signals for up and downconversion in wireless communications devices.

LMX2505 includes dual voltage controlled oscillators (VCOs)for the upper and lower Japan PDC frequency bands, a loopfilter, and a fractional-N RF PLL based on a delta sigmamodulator. In concert these blocks form a closed loop RFsynthesizer system. The RF synthesizer system supportstwo frequency bands: PDC1500 and PDC800.

Serial data is transferred to the device via a three-wireMICROWIRE interface (DATA, LE, CLK).

Operating supply voltage ranges from 2.5 V to 3.3 V.LMX2505 features low current consumption: 10 mA at 2.8 Vwhen operating in the PDC800 mode.

LMX2505 is available in a 28-pin leadless leadframe pack-age (LLP).