LMX2502 Texas instruments

LMX2502

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LMX2502

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Описание

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.

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

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Integrated VCO	Yes
Output frequency (min) (MHz)	1619.62
Output frequency (max) (MHz)	1649.62
Normalized PLL phase noise (dBc/Hz)	-138
Current consumption (mA)	17
Features	Integrated VCO
Rating	Catalog
Operating temperature range (°C)	-30 to 85
Lock time (µs) (typ)	500