LTC6947IUFD#PBF

The LTC6947IUFD#PBF is Analog Devices’ (Linear Technology) high-performance, digitally controlled RF frequency synthesizer/clock generator. It provides a wide-band VCO with a programmable fractional- or integer-N divider and an SPI-compatible interface, letting you synthesize precise RF/local-oscillator frequencies with low jitter and relatively low power. Typical uses include LO generation for RF transceivers, up/down converters, test gear, and clock generation in RF front-ends.
Suffix notes:
- #PBF means RoHS-compliant, lead-free packaging.
- IUFD denotes the specific package/temperature variant per ADI’s packaging table.
How to use (high level): provide a reference clock, program the desired output frequency via SPI by selecting division ratios (and fractional control if available), and follow the datasheet’s guidance for the VCO tank, decoupling, and loop-filter requirements. For exact specs, see the LTC6947 data sheet.

Here are the key features of LTC6947IUFD#PBF (as per the datasheet). For exact specs, please refer to the official data sheet.
- Fully integrated RF frequency synthesizer with fractional-N and integer-N operation
- Programmable division ratios (N, R) for fine and versatile frequency synthesis
- SPI-compatible serial control interface for programming, status readback, and control (enable, power-down, lock detect)
- Low-phase-noise, low-jitter performance suitable for high-performance RF/ microwave applications
- Wide operating frequency range (RF output) with programmable output divider
- Reference input with programmable divider options and external reference compatibility
- Output options with enable/disable control and configurable output power
- Built-in features such as lock detect, soft-start/fast-lock behavior, and power-down mode
- Industrial-grade temperature range and robust, Pb-free (PBF) packaging (IUFD series)
Note: Please consult the actual LTC6947 data sheet for precise electrical specs (frequency range, ranges, voltage, current, and timing) and package/pin details.

Manufacturer: Analog Devices, Inc. (the LTC6947 is an LTC/Linear Technology part—Linear Technology was acquired by Analog Devices in 2017).
What kind of company: Analog Devices is an American multinational semiconductor firm that designs, manufactures and sells high-performance analog, mixed-signal and digital signal-processing integrated circuits and related products for industrial, automotive, communications, consumer, and aerospace & defense markets.

LTC6947IUFD#PBF is used as a high‑performance frequency synthesizer for RF/ microwave systems. Typical applications include:
- RF front‑end LO generation for up/down-converters
- Wireless infrastructure: base stations, small cells, Wi‑Fi, point‑to‑point links
- Radar, navigation, and surveillance systems
- Satellite communications (uplink/downlink LO/timing)
- Test and measurement equipment (signal generators, spectrum analyzers)
- Software‑defined radio and lab prototyping
- Microwave/millimeter‑wave links and clocking for high‑speed converters and SERDES
These cover systems needing precise, programmable RF/IF frequency synthesis and clock generation.

8‑pin MSOP (3x3 mm) package, RoHS Pb‑free. The #PBF suffix indicates Pb‑free.