Products
LTC6948
LAST TIME BUYUltralow Noise 0.37GHz to 6.39GHz Fractional-N Synthesizer with Integrated VCO
- Part Models
- 7
- 1ku List Price
- Starting From $9.00
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Overview
- 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
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
Documentation
Data Sheet 1
User Guide 2
Technical Articles 2
Product Selector Card 1
Solutions Bulletin & Brochure 1
Webcast 1
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 |
|---|---|---|---|
| LTC6948IUFD-1#PBF | 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | ||
| LTC6948IUFD-1#TRPBF | 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | ||
| LTC6948IUFD-2#PBF | 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | ||
| LTC6948IUFD-2#TRPBF | 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | ||
| LTC6948IUFD-3#TRPBF | 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | ||
| LTC6948IUFD-4#PBF | 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | ||
| LTC6948IUFD-4#TRPBF | 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Feb 20, 2022 - 21_0269 Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products |
||
| LTC6948IUFD-1#PBF | ||
| LTC6948IUFD-1#TRPBF | ||
| LTC6948IUFD-2#PBF | ||
| LTC6948IUFD-2#TRPBF | ||
| LTC6948IUFD-3#TRPBF | ||
| LTC6948IUFD-4#PBF | ||
| LTC6948IUFD-4#TRPBF | ||
|
Mar 20, 2024 - 23_0089 Obsolescence of Tower Fab3 (JAZZ-3) SBC35 Process |
||
| LTC6948IUFD-1#PBF | ||
| LTC6948IUFD-1#TRPBF | ||
| LTC6948IUFD-2#PBF | ||
| LTC6948IUFD-2#TRPBF | ||
| LTC6948IUFD-3#TRPBF | ||
| LTC6948IUFD-4#PBF | ||
| LTC6948IUFD-4#TRPBF | ||
This is the most up-to-date revision of the Data Sheet.
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.
Can't find the software or driver you need?
Hardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| Comparators 1 | ||
| LTC6957 | Low Phase Noise, Dual Output Buffer/Driver/Logic Converter | |
| Modulators & Demodulators 1 | ||
| LTC5588-1 | PRODUCTION | 200MHz to 6000MHz Quadrature Modulator with Ultrahigh OIP3 |
| Phase-Locked Loop (PLL) Synthesizers 1 | ||
| ADF4002 | RECOMMENDED FOR NEW DESIGNS | Phase Detector / PLL Frequency Synthesizer |
| RF Mixers 1 | ||
| LTC5569 | PRODUCTION | 300MHz to 4GHz 3.3V Dual Active Downconverting Mixer |
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.
Open ToolLinduino 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.
Evaluation Kits
LTC6948-2 Demo Board: Ultralow Noise and Spurious Fractional-N Synthesizer with Integrated VCO (Requires DC590 or DC2026)
Resources
LT3042 Low Noise PLL/VCO Power Supply Board with Onboard 100MHz Reference Frequency
Resources
LTC6948-4 Demo Board | Ultralow Noise and Spurious 700MHz to 6.39GHz Frac-N Synthesizer with Integrated VCO, (Requires DC590 or DC2026)
Resources
LTC6948-3 Demo Board| Ultralow Noise and Spurious 640MHz to 5.79GHz Frac-N Synthesizer with Integrated VCO, (Requires DC590)
Resources
LTC6948-1 Demo Board | Ultralow Noise and Spurious 373MHz to 3.74GHz Frac-N Synthesizer with Integrated VCO, (Requires DC590 or DC2026)