LTC6948
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LTC6948

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

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Part Details
Part Models 7
1ku List Price Starting From $9.00
Features
  • 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
Additional Details
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The LTC6948 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), ultralow noise charge pump, fractional feedback divider, and VCO output divider.

The fractional divider uses an advanced, 4th order ΔΣ modulator which provides exceptionally low spurious levels. This allows wide loop bandwidths, producing extremely low integrated phase noise values.

The programmable VCO output divider, with a range of 1 through 6, extends the output frequency range.

Applications

  • Wireless Basestations (LTE, WiMAX, W-CDMA, PCS)
  • Microwave Data Links
  • Military and Secure Radio
  • Test and Measurement
Part Models 7
1ku List Price Starting From $9.00

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
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Product Lifecycle

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Feb 20, 2022

- 21_0269

Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products

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Mar 20, 2024

- 23_0089

Obsolescence of Tower Fab3 (JAZZ-3) SBC35 Process

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Part Models

Product Lifecycle

PCN

Feb 20, 2022

- 21_0269

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Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products

LTC6948IUFD-1#PBF

LAST TIME BUY

LTC6948IUFD-1#TRPBF

LAST TIME BUY

LTC6948IUFD-2#PBF

LAST TIME BUY

LTC6948IUFD-2#TRPBF

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LTC6948IUFD-3#TRPBF

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LTC6948IUFD-4#PBF

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LTC6948IUFD-4#TRPBF

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Mar 20, 2024

- 23_0089

arrow down

Obsolescence of Tower Fab3 (JAZZ-3) SBC35 Process

LTC6948IUFD-1#PBF

LAST TIME BUY

LTC6948IUFD-1#TRPBF

LAST TIME BUY

LTC6948IUFD-2#PBF

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LTC6948IUFD-2#TRPBF

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Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 5

reference details 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)

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DC1959B-D

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

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

Product Detail

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



reference details image

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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DC1959B-A

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

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

Product Detail

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



reference details image

DC1959B-B

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

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DC1959B-B

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

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

Product Detail

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.

reference details image

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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DC1959A-C

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

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

Product Detail

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.



reference details image

DC2429A

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

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DC2429A

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

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

Product Detail

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.


 


Tools & Simulations

Tools & Simulations 3

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.

Purchase Linduino

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