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LMX2486SQ Datasheet(PDF) 1 Page - Texas Instruments |
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LMX2486SQ Datasheet(HTML) 1 Page - Texas Instruments |
1 / 47 page VddRF5 Phase Comp FinIF Charge Pump CPoutIF Ftest/LD MUX Ftest/LD IF LD Phase Comp 8/9 or 16/17 Prescaler B Counter IF N Divider A Counter FLoutRF VddIF2 VddIF1 RF N Divider GND GND GND FinRF FinRF* 16/17/20/21 or 32/33/36/37 Prescaler C Counter 6' Compensation A Counter B Counter RF N Divider ENOSC OSCout OSCin VddRF4 VddRF3 VddRF2 VddRF1 IF R Divider RF R Divider 1X / 2X RF LD Charge Pump CPoutRF RF Fastlock MICROWIRE Interface CLK LE DATA CE Product Folder Sample & Buy Technical Documents Tools & Software Support & Community LMX2486 SNAS324B – JANUARY 2006 – REVISED JANUARY 2016 LMX2486 1-GHz to 4.5-GHz High-Performance Delta-Sigma Low-Power Dual PLLatinum™ Frequency Synthesizers With 3-GHz Integer PLL 1 1 Features • Quadruple Modulus Prescaler for Lower Divids 3 Description The LMX2486 device is a low-power, high – RF PLL: 16/17/20/21 or 32/33/36/37 performance delta-sigma fractional-N PLL with an – IF PLL: 8/9 or 16/17 auxiliary integer-N PLL. The device is fabricated • Advanced Delta Sigma Fractional Compensation using TI’s advanced process. – 12-Bit or 22-Bit Selectable Fractional Modulus With delta-sigma architecture, fractional spurs at – Up to 4th Order Programmable Delta-Sigma lower offset frequencies are pushed to higher Modulator frequencies outside the loop bandwidth. The ability to push close in spur and phase noise energy to higher • Improved Lock Times and Programming frequencies is a direct function of the modulator – Fastlock / Cycle Slip Reduction Which order. Unlike analog compensation, the digital Requires Only a Single-Word Write feedback technique used in the LMX2486 is highly – Integrated Time-Out Counter resistant to changes in temperature and variations in wafer processing. The LMX2486 delta-sigma • Wide Operating Range modulator is programmable up to fourth order, which – LMX2486 RF PLL: 1.0 GHz to 4.5 GHz allows the designer to select the optimum modulator • Useful Features order to fit the phase noise, spur, and lock time requirements of the system. – Digital Lock Detect Output – Hardware and Software Power-Down Control Serial data for programming the LMX2486 is transferred through a three-line, high-speed (20-MHz) – On-Chip Crystal Reference Frequency Doubler MICROWIRE interface. The LMX2486 offers fine – RF Phase Detector Frequency Up to 50 MHz frequency resolution, low spurs, fast programming – 2.5-V to 3.6-V Operation With ICC = 8.5 mA speed, and a single-word write to change the frequency. This makes it ideal for direct digital 2 Applications modulation applications, where the N-counter is directly modulated with information. The LMX2486 is • Cellular Phones and Base Stations available in a 24-lead 4.0 × 4.0 × 0.8 mm WQFN • Direct Digital Modulation Applications package. • Satellite and Cable TV Tuners Device Information(1) • WLAN Standards PART NUMBER PACKAGE BODY SIZE (NOM) LMX2486 WQFN (24) 4.00 mm × 4.00 mm (1) For all available packages, see the orderable addendum at the end of the data sheet. Functional Block Diagram 1 An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA. |
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