LMX2485E - TI

The pictures are for reference only, and the specific specifications can be found in the product manual.

Part No

LMX2485E
Manufacturer

TI
ChipWorker Part#

CW392822146
RoHS

Lead free / RoHS Compliant
Description

PLL FREQUENCY SYNTHESIZER, 3000MHz, PQCC24, 4 X 4MM, 0.8MM, PLASTIC, LLP-24
Documentation

Datasheet

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LMX2485E Specifications

Attribute	Attribute Value

Part Number	LMX2485E
Manufacturer	TI
ChipWorker Part#	CW392822146
Documentation	Datasheet
Case/Package	HVQCCN
	expand all
RoHS	RoHS Compliant
Lead-Free Status	Lead Free

Product Description

The LMX2485 device is a low power, high performance delta-sigma fractional-N PLL with an auxiliary integer-N PLL. The device is fabricated using Texas Instruments advanced process.
With delta-sigma architecture, fractional spurs at lower offset frequencies are pushed to higher frequencies outside the loop bandwidth. The ability to push close in spur and phase noise energy to higher frequencies is a direct function of the modulator order. Unlike analog compensation, the digital feedback technique used in the LMX2485 is highly resistant to changes in temperature and variations in wafer processing. The LMX2485 delta-sigma modulator is programmable up to fourth order, which allows the designer to select the optimum modulator order to fit the phase noise, spur, and lock time requirements of the system.
Serial data for programming the LMX2485 is transferred through a three-line, high-speed (20-MHz) MICROWIRE interface. The LMX2485 offers fine frequency resolution, low spurs, fast programming speed, and a single-word write to change the frequency. This makes it ideal for direct digital modulation applications, where the N-counter is directly modulated with information. The LMX2485 is available in a 24-lead 4.0 × 4.0 × 0.8 mm WQFN package.
Quadruple Modulus Prescaler for Lower Divides
RF PLL: 8/9/12/13 or 16/17/20/21
IF PLL: 8/9 or 16/17
Advanced Delta-Sigma Fractional Compensation
12-Bit or 22-Bit Selectable Fractional Modulus
Up to 4th Order Programmable Delta-Sigma
Modulator
Features for Improved Lock Time
Fastlock / Cycle Slip Reduction With Integrated
Time-Out Counter Which Requires Only a
Single-Word Write
Wide Operating Range
LMX2485 RF PLL: 500 MHz to 3.0 GHz
LMX2485E RF PLL: 50 MHz to 3.0 GHz
Useful Features
Digital Lock Detect Output
Hardware and Software Power-Down Control
On-Chip Input Frequency Doubler.
RF Phase Detector Frequency up to 50 MHz
2.5 to 3.6 V Operation With ICC = 5.0 mA

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