LTC6946
Ultralow Noise and Spurious 0.37GHz to 6.39GHz Integer-N Synthesizer with Integrated VCO
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Overview
Features and Benefits
- Low Noise Integer-N PLL with Integrated VCO
- –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)
- Output Buffer Muting
- Low Noise Reference Buffer
- Charge Pump Current Adjustable from 250μA to 11.2mA
- Configurable Status Output
- SPI Compatible Serial Port Control
- PLLWizard™ Software Design Tool Support
Product Details
The LTC6946 is a high performance, low noise, 6.39GHz phase-locked loop (PLL) with a fully integrated VCO, including a reference divider, phase-frequency detector (PFD) with phase-lock indicator, ultralow noise charge pump, integer feedback divider, and VCO output divider. The charge pump contains selectable high and low voltage clamps useful for VCO monitoring.
The integrated low noise VCO uses no external components. It is internally calibrated to the correct output frequency with no external system support.
The part features a buffered, programmable VCO output divider with a range of 1 through 6, providing a wide frequency range.
| LTC6946-1 | LTC6946-2 | LTC6946-3 | LTC6946-4 | |
| 0 DIV = 1 | 2.240 to 3.740 | 3.080 to 4.910 | 3.840 to 5.790 | 4.200 to 6.390 |
| 0 DIV = 2 | 1.120 to 1.870 | 1.540 to 2.455 | 1.920 to 2.895 | 2.100 to 3.195 |
| 0 DIV = 3 | 0.747 to 1.247 | 1.027 to 1.637 | 1.280 to 1.930 | 1.400 to 2.130 |
| 0 DIV = 4 | 0.560 to 0.935 | 0.770 to 1.228 | 0.960 to 1.448 | 1.050 to 1.598 |
| 0 DIV = 5 | 0.448 to 0.748 | 0.616 to 0.982 | 0.768 to 1.158 | 0.840 to 1.278 |
| 0 DIV = 6 | 0.373 to 0.623 | 0.513 to 0.818 | 0.640 to 0.965 | 0.700 to 1.065 |
Applications
- Wireless Base Stations (LTE, WiMAX, W-CDMA, PCS)
- Broadband Wireless Access
- Military and Secure Radio
- Test and Measurement
Product Categories
Product Lifecycle
Last Time Buy
All products in this family will be obsolete soon. Please contact ADI Sales or Distributors to arrange for final purchases and read our Obsolescence Information to review the time periods for placing final orders and receiving final shipments.
Evaluation Kits (5)
Documentation & Resources
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R565 Reliability Data3/23/2018
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DC1705C - Demo Manual3/31/2015
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Ultralow Noise Synthesizers5/20/2015
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Debugging the LTC6946: Getting the PLL to Lock1/23/2018
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Ultrafast Frequency Switching Using a PLL9/26/2016
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Uncompromised Clocking Solution for 16-Bit 2.5Gsps High Performance DAC9/6/2016
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Phase Noise of Integer-N and Fractional-N PLL Synthesizers2/10/2015
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Fractional-N PLL with Integrated 6GHz+ VCO Delivers Fractional-N Benefits without Complexity or Performance Downsides7/1/2014 LT Journal
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Integer-N Synthesizer with Integrated VCO Yields Top Notch PLL Performance in a 4mm × 5mm Package1/1/2012 LT Journal
Software & Systems Requirements
Evaluation Software
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.
Tools & Simulations
Linduino
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.
IBIS Model
IBS
LTC6946 - IBIS Model
93.00K
Design Tool
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.
Product Recommendations
LTC6946 Companion Parts
Recommended D/A Converters
Recommended Reference Buffer
- With integrated filters for improved noise: LTC6957.
Recommended Suggested Oscillator
Design Resources
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 Number | Material Declaration | Reliability Data | Pin/Package Drawing | CAD Symbols, Footprints & 3D Models |
|---|---|---|---|---|
| LTC6946IUFD-1#PBF | Material Declaration | Reliability Data | 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | |
| LTC6946IUFD-4#TRPBF | Material Declaration | Reliability Data | 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | |
| Wafer Fabrication Data | R565 Reliability Data |
PCN-PDN Information
Select a model from the dropdown below to subscribe to PCN/PDN notifications and view past notifications as well.
Support & Discussions
LTC6946 Discussions
Sample & Buy
Ordering FAQs
See our Ordering FAQs for answers to questions about online orders, payment options and more.
Buy Now Pricing
(**) Displayed Buy Now Price and Price Range is based on small quantity orders.
List Pricing
(*)The 1Ku list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
Lead Times
Please see the latest communication from our CCO regarding lead times.
Sampling
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Evaluation Boards
Pricing displayed is based on 1-piece.
Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.
Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.