LTC6945

Obsolete

Ultralow Noise and Spurious 0.35GHz to 6GHz Integer-N Synthesizer

Data Sheet Product Selection Table

Part Models: 1
1ku List Price: price unavailable

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Part Details

Low Noise Integer-N PLL
350MHz to 6GHz VCO Input Range
–226dBc/Hz Normalized In-Band Phase Noise Floor
–274dBc/Hz Normalized In-Band 1/f Noise
–157dBc/Hz Wideband Output Phase Noise Floor
Excellent Spurious Performance
Output Divider (1 to 6, 50% Duty Cycle)
Low Noise Reference Buffer

Output Buffer Muting
Charge Pump Supply from 3.15V to 5.25V
Charge Pump Current from 250μA to 11.2mA
Configurable Status Output
SPI Compatible Serial Port Control
PLLWizard^™ Software Design Tool Support

Part Models: 1
1ku List Price: price unavailable

Documentation

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LTC6945IUFD#TRPBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Sep 24, 2021 - 21_0121 Obsolescence of LTC6945, LTC6946, and LTC6950
		PDN21_0121_Form Material_Report
LTC6945IUFD#TRPBF	PRODUCTION	PDN21_0121_Form Material_Report

This is the most up-to-date revision of the Data Sheet.

Software Resources

Evaluation Software 1

PLLWizard

PLLWizard is used to communicate with the LTC6945 and LTC6946 synthesizers. It uses the DC590 controller to translate between USB and SPI-compatible serial communications formats. It also includes advanced PLL design and simulation capabilities which aid in loop filter design and selecting the correct SPI map register values.

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Clock Generation Devices 1
LTC6950	Obsolete	1.4GHz Low Phase Noise, Low Jitter PLL with Clock Distribution
High Voltage Op Amps ≥12V 1
LT1678	PRODUCTION	Dual/Quad Low Noise, Rail-to-Rail, Precision Op Amps
I/Q Demodulators 1
LTC5585	PRODUCTION	Wideband IQ Demodulator with IIP2 and DC Offset Control

Parts	Product Life Cycle	Description
ADF41510	RECOMMENDED FOR NEW DESIGNS	10 GHz, Integer-N/Fractional-N PLL Synthesizer

Tools & Simulations

Linduino 3

IBIS Model 1

LTC6945 - IBIS Model

ADIsimPLL™

ADIsimPLL enables the rapid and reliable evaluation of new high performance PLL products from ADI. It is the most comprehensive PLL Synthesizer design and simulation tool available today. Simulations performed include all key non-linear effects that are significant in affecting PLL performance. ADIsimPLL removes at least one iteration from the design process, thereby speeding the design- to-market.

Open Tool

Linduino is Analog Devices’ Arduino compatible system for developing and distributing firmware libraries and example code for our integrated circuits. Each Linduino-supported product includes an example main program, defined in the LTSketchbook/Part Number folder and driver code, defined in the LTSketchbook/libraries folder.

Linduino code repository on GitHub and instructions on how to use the code.

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Evaluation Kits

LT3042 Low Noise PLL/VCO Power Supply Board with Onboard 100MHz Reference Frequency

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Product Details

Demonstration Circuit 2429A is a PLL/VCO Supply and Reference Frequency Board that features the LT3042, an ultralow noise and ultrahigh PSRR RF linear regulator. When powered from a 6V to 20V lab or wall wart supply, the DC2429A produces four ultralow noise supplies using seven LT3042s. These supplies include a fixed 3.3V/800mA supply (four LT3042's in parallel), a fixed 5V/200mA supply, a fixed 3.3V/200mA supply that powers an onboard 100MHz ultralow jitter crystal oscillator, and an adjustable voltage (2.5V to 15V), 200mA supply ideal for powering external VCOs. The DC2429 ensures PLL/VCO evaluation meets data sheet performance.