LTC6948

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Ultralow Noise 0.37GHz to 6.39GHz Fractional-N Synthesizer with Integrated VCO

Data Sheet Product Selection Table
Part Models
7
1ku List Price
Starting From $9.00
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Part Details

  • Low Noise Fractional-N PLL with Integrated VCO
  • No Δ-Σ Modulator Spurs
  • 18-Bit Fractional Denominator
  • –226 dBc/Hz Normalized In-Band Phase Noise Floor
  • –274 dBc/Hz Normalized In-Band 1/f Noise
  • –157 dBc/Hz Wideband Output Phase Noise Floor
  • Excellent Integer Boundary Spurious Performance
  • Output Divider (1 to 6, 50% Duty Cycle)
  • Output Buffer Muting
  • Reference Input Frequency Up to 425MHz
  • Fast Frequency Switching
  • FracNWizard™ Software Design Tool Support
LTC6948
Ultralow Noise 0.37GHz to 6.39GHz Fractional-N Synthesizer with Integrated VCO
6.3GHz Wideband Receiver LTC6948-4 Phase Noise, fRF = 6236MHz Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 2

Technical Articles 2

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
I/Q Modulators 1
LTC5588-1
PRODUCTION 200MHz to 6000MHz Quadrature Modulator with Ultrahigh OIP3
Integer-N PLL 1
ADF4002
RECOMMENDED FOR NEW DESIGNS Phase Detector / PLL Frequency Synthesizer
Single, Double, and Triple Balanced Mixers 1
LTC5569
PRODUCTION 300MHz to 4GHz 3.3V Dual Active Downconverting Mixer
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Tools & Simulations

Linduino 3

IBIS Model 1

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.

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Evaluation Kits

eval board
schematic 1
DC1959B-B

LTC6948-2 Demo Board: Ultralow Noise and Spurious Fractional-N Synthesizer with Integrated VCO (Requires DC590 or DC2026)

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Product Details

Demonstration circuit 1959B features the LTC6948, an Ultralow Noise and Spurious Fractional-N Synthesizer with Integrated VCO.

There are four options of the DC1959B, one for each version of the LTC6948. Table 1 summarizes the available DC1959B options.

The DC1959B provides 50Ω SMA connectors for the reference frequency input fREF (REF+IN) and the differential RF output (RF+ and RF–).

A DC590 USB serial controller board is used for SPI communication with the LTC6948, controlled by the supplied FracNWizard™ software.

eval board
schematic 2
schematic 3
schematic 4
schematic 5
schematic 6
DC1959B-A

LTC6948-1 Demo Board | Ultralow Noise and Spurious 373MHz to 3.74GHz Frac-N Synthesizer with Integrated VCO, (Requires DC590 or DC2026)

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Product Details

Demonstration circuit 1959B features the LTC6948, an Ultralow Noise and Spurious Fractional-N Synthesizer with Integrated VCO.



eval board
schematic 7
schematic 8
schematic 9
schematic 10
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 11
schematic 12
DC1959B-D

LTC6948-4 Demo Board | Ultralow Noise and Spurious 700MHz to 6.39GHz Frac-N Synthesizer with Integrated VCO, (Requires DC590 or DC2026)

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Product Details

Demonstration circuit 1959B features the LTC6948, an Ultralow Noise and Spurious Fractional-N Synthesizer with Integrated VCO.



eval board
schematic 13
schematic 14
schematic 15
schematic 16
schematic 17
DC1959A-C

LTC6948-3 Demo Board| Ultralow Noise and Spurious 640MHz to 5.79GHz Frac-N Synthesizer with Integrated VCO, (Requires DC590)

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Product Details

Demonstration circuit 1959A features the LTC6948, an Ultralow Noise and Spurious Fractional-N Synthesizer with Integrated VCO. There are four options of the DC1959A, one for each version of the LTC6948. Table 1 summarizes the available DC1959A options.
DC1959B-B
LTC6948-2 Demo Board: Ultralow Noise and Spurious Fractional-N Synthesizer with Integrated VCO (Requires DC590 or DC2026)
DC1959A-B Demo Board
DC1959B-A
LTC6948-1 Demo Board | Ultralow Noise and Spurious 373MHz to 3.74GHz Frac-N Synthesizer with Integrated VCO, (Requires DC590 or DC2026)
DC1959B-A Demo Board DC1959B-A Demo Board DC1959B-A Demo Board DC1959B-A Demo Board DC1959B - Schematic
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
DC1959B-D
LTC6948-4 Demo Board | Ultralow Noise and Spurious 700MHz to 6.39GHz Frac-N Synthesizer with Integrated VCO, (Requires DC590 or DC2026)
DC1959B-D Demo Board DC1959B - Schematic
DC1959A-C
LTC6948-3 Demo Board| Ultralow Noise and Spurious 640MHz to 5.79GHz Frac-N Synthesizer with Integrated VCO, (Requires DC590)
DC1959A-C Demo Board DC1959A-C Demo Board DC1959A-C Demo Board DC1959A-C Demo Board DC1959A - Schematic

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