LTC6947

Obsolete

Ultralow Noise 0.35GHz to 6GHz Fractional-N Synthesizer

Data Sheet Product Selection Table
Part Models
2
1ku List Price
Starting From $7.39
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Part Details

  • Low Noise Fractional-N PLL
  • No ΔΣ Modulator Spurs
  • 18-Bit Fractional Denominator
  • 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 Integer Boundary Spurious Performance
  • Output Divider (1 to 6, 50% Duty Cycle)
  • Output Buffer Muting
  • Charge Pump Supply from 3.15V to 5.25V
  • Charge Pump Current from 1mA to 11.2mA
  • Reference Input Frequency Up to 425MHz
  • Fast Frequency Switching
LTC6947
Ultralow Noise 0.35GHz to 6GHz Fractional-N Synthesizer
11GHz Source for Satellite Communications System Phase Noise, fRF = 11.260GHz Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Technical Articles 1

Data Sheet

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

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Software Resources

Evaluation Software 1

FracNWizard

FracNWizard is used to communicate with the LTC6947 and LTC6948 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.

Hardware Ecosystem

Parts Product Life Cycle Description
High Speed Comparators (<100ns Propagation Delay) 1
LTC6957
Low Phase Noise, Dual Output Buffer/Driver/Logic Converter
High Voltage Op Amps ≥12V 1
LT1678
PRODUCTION Dual/Quad Low Noise, Rail-to-Rail, Precision Op Amps
I/Q Modulators 1
LTC5588-1
PRODUCTION 200MHz to 6000MHz Quadrature Modulator with Ultrahigh OIP3
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Tools & Simulations

Linduino 3

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

IBIS Model 1

Evaluation Kits

eval board
schematic 1
schematic 2
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schematic 4
DC2429A

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.


 


eval board
schematic 5
schematic 6
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DC1846A-A

LTC6947 Demo Board | Ultralow Noise and Spurious 350MHz to 6GHz Frac-N Synthesizer, VCO=2328-2536MHz , (Requires DC590)

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Product Details

Demonstration circuit 1846A features the LTC6947, an Ultralow Noise and Spurious Fractional-N Synthesizer. DC1846A provides 50Ω SMA connectors for the reference frequency (REF+) and the two single-ended RF outputs (RF+ and RF–).


 
DC2429A
LT3042 Low Noise PLL/VCO Power Supply Board with Onboard 100MHz Reference Frequency
DC2429A Demo Board DC2429A Demo Board DC2429A Demo Board DC2429A Demo Board Image
DC1846A-A
LTC6947 Demo Board | Ultralow Noise and Spurious 350MHz to 6GHz Frac-N Synthesizer, VCO=2328-2536MHz , (Requires DC590)
DC1846A-A Demo Board DC1846A-A Demo Board DC1846A-A Demo Board DC1846A-A Demo Board DC1846A - Schematic

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