LMX2502数据手册RF/IF射频/中频RFID的RFIC模块规格书PDF

描述 Description

LMX2502 and LMX2512 are highly integrated, high performance, low power frequency synthesizer systems optimized for Korean PCS and Korean Cellular CDMA (1xRTT, IS-95) mobile handsets. Using a proprietary digital phase locked loop technique, LMX2502 and LMX2512 generate very stable, low noise local oscillator signals for up and down conversion in wireless communications devices. LMX2502 and LMX2512 include a voltage controlled oscillator (VCO), a loop filter, and a fractional-N RF PLL based on a delta sigma modulator. In concert these blocks form a closed loop RF synthesizer system. LMX2502 supports the Korean PCS band and LMX2512 supports the Korean Cellular band. LMX2502 and LMX2512 include an Integer-N IF PLL also. For more flexible loop filter designs, the IF PLL includes a 4-level programmable charge pump. Together with an external VCO and loop filter, LMX2502 and LMX2512 make a complete closed loop IF synthesizer system. Serial data is transferred to the device via a three-wire MICROWIRE interface (DATA, LE, CLK). Operating supply voltage ranges from 2.7 V to 3.3 V. LMX2502 and LMX2512 feature low current consumption: 17 mA at 2.8 V. LMX2502 and LMX2512 are available in a 28-pin WQFN package.

特性 Features

• Small Size
• 5.0 mm X 5.0 mm X 0.75 mm 28-Pin WQFN Package

• RF Synthesizer System
• Integrated RF VCO
• Integrated Loop Filter
• Low Spurious, Low Phase Noise Fractional-N RF PLL Based on 11-Bit Delta Sigma Modulator
• 10 kHz Frequency Resolution

• IF Synthesizer System
• Integer-N IF PLL
• Programmable Charge Pump Current Levels
• Programmable Frequency

• Supports Various Reference Frequencies
• 19.20/19.68 MHz

• Fast Lock Time: 500 µs
• Low Current Consumption
• 17 mA at 2.8 V

• 2.7 V to 3.3 V Operation
• Digital Filtered Lock Detect Output
• Hardware and Software Power Down Control