Overview
The LTC6948IUFD-1#TRPBF is a high-performance, low-noise phase-locked loop (PLL) synthesizer produced by Analog Devices Inc. This device is part of the LTC6948 family and is known for its exceptional noise performance and wide frequency range. The LTC6948IUFD-1#TRPBF features a fully integrated voltage-controlled oscillator (VCO), a reference divider, a phase-frequency detector (PFD), an ultralow noise charge pump, a fractional feedback divider, and a VCO output divider. This makes it an ideal component for applications requiring precise frequency synthesis and low phase noise.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| Reference Inputs (REF+, REF–) | fREF Input Frequency | 10 | 425 | MHz | |
| VREF Input Signal Level | 0.5 | 2 | 2.7 | VP-P | |
| Input Slew Rate | 20 | V/µs | |||
| VCO | fVCO Frequency Range | 2.24 | 3.74 | GHz | |
| KVCO Tuning Sensitivity | 4.7 | 7.2 | %Hz/V | ||
| RF Output (RF+, RF–) | fRF Output Frequency | 0.373 | 6.39 | GHz | |
| Output Divider Range | 1 | 6 | |||
| Output Resistance Single-Ended | 100 | 136 | 175 | Ω |
Key Features
- Ultralow Noise: The LTC6948IUFD-1#TRPBF features exceptionally low phase noise, thanks to its advanced 4th order Δ∑ modulator and ultralow noise charge pump.
- Wide Frequency Range: The device operates over a wide frequency range from 0.373 GHz to 6.39 GHz.
- Programmable VCO Output Divider: The VCO output divider is programmable with a range of 1 through 6, extending the output frequency range.
- Fractional Feedback Divider: Uses an advanced fractional feedback divider to achieve low spurious levels and wide loop bandwidths.
- Integrated Components: Includes a reference divider, phase-frequency detector (PFD), and VCO, making it a comprehensive solution for frequency synthesis.
Applications
- Wireless Communication Systems: Ideal for use in cellular base stations, wireless local area networks (WLAN), and other wireless communication systems requiring precise frequency synthesis.
- Test and Measurement Equipment: Suitable for use in signal generators, spectrum analyzers, and other test equipment where low noise and high frequency stability are crucial.
- Radar Systems: Used in radar systems that require high-frequency stability and low phase noise.
- Medical Imaging: Can be used in medical imaging equipment such as MRI and PET scanners where precise frequency control is necessary.
Q & A
- What is the frequency range of the LTC6948IUFD-1#TRPBF?
The frequency range of the LTC6948IUFD-1#TRPBF is from 2.24 GHz to 3.74 GHz for the VCO, and the overall output frequency range is from 0.373 GHz to 6.39 GHz with the programmable output divider.
- What is the phase noise performance of the LTC6948IUFD-1#TRPBF?
The LTC6948IUFD-1#TRPBF features exceptionally low phase noise, with integrated phase noise values that are among the lowest in its class, thanks to its advanced Δ∑ modulator and ultralow noise charge pump.
- What is the purpose of the fractional feedback divider in the LTC6948IUFD-1#TRPBF?
The fractional feedback divider is used to achieve low spurious levels and wide loop bandwidths, which are critical for maintaining high frequency stability and low noise.
- What are the key components integrated into the LTC6948IUFD-1#TRPBF?
The device includes a reference divider, phase-frequency detector (PFD), ultralow noise charge pump, fractional feedback divider, and a VCO output divider, making it a comprehensive solution for frequency synthesis.
- What is the output resistance of the RF output in single-ended configuration?
The output resistance in single-ended configuration is between 100 Ω and 175 Ω.
- What is the typical input signal level for the reference inputs?
The typical input signal level for the reference inputs is 2 VP-P.
- What is the tuning sensitivity of the VCO in the LTC6948IUFD-1#TRPBF?
The VCO tuning sensitivity is between 4.7 %Hz/V and 7.2 %Hz/V.
- What are some common applications of the LTC6948IUFD-1#TRPBF?
Common applications include wireless communication systems, test and measurement equipment, radar systems, and medical imaging equipment.
- Is the LTC6948IUFD-1#TRPBF available for purchase, and if so, where can it be found?
The LTC6948IUFD-1#TRPBF is available for purchase from distributors such as Digi-Key, Mouser, and LCSC, although it is scheduled for obsolescence.
- What is the package type of the LTC6948IUFD-1#TRPBF?
The device is packaged in a QFN-28-EP (4x5) package.
