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LTC6947IUFD

Name: LTC6947IUFD
Rating: 4.7 (12 reviews)

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規格

Part Status	Obsolete
Base Product Number	LTC6947
DigiKey Programmable	Not Verified
PLL	Yes
Input	Clock
Output	Clock
Number of Circuits	1
Ratio - Input:Output	1:1
Differential - Input:Output	Yes/Yes
Frequency - Max	6GHz
Divider/Multiplier	Yes/No
Voltage - Supply	3.15V ~ 5.25V
Operating Temperature	-40°C ~ 105°C
Mounting Type	Surface Mount
Package	28-WFQFN Exposed Pad
Supplier Device Package	28-QFN (4x5)
Packaging	Tube

概述

Description

LTC6947IUFD is Linear Technology’s (now Analog Devices) RF frequency‑synthesizer: a fractional‑N phase‑locked loop (PLL) used to generate precise RF frequencies by controlling a VCO via programmable division. The device integrates the PLL core (phase detector, charge pump, reference/dividers) and supports fine frequency steps with fractional division. The “IUFD” suffix indicates the packaging variant (industrial temperature range, 8‑lead MSOP/related small package).
Key points:
- Programmable frequency synthesis for RF/LO generation
- Fractional‑N operation for fine stepping
- SPI or other digital interface for configuring output frequency and divider ratios
- Requires external VCO and loop‑filter network per design
- Suitable for RF transceivers, wireless test gear, LO generation, and similar applications
For exact specs (frequency range, phase noise, output levels, supply voltage, and detailed programming), consult the LTC6947 datasheet and the product page.

Features

LTC6947IUFD features (summary):
- Fully integrated wideband PLL synthesizer with fractional-N capability for precise frequency steps
- Programmable division ratios (N) and fractional modulus via SPI control
- Reference input/divider options for flexible reference frequencies
- External VCO control or VCO-driven output architecture (VCO control voltage supplied by the part)
- SPI/DSP-style interface for programming N, FRAC, ref divider, power modes, and lock detect
- Output options with programmable divider and on-chip charge pump for stable RF outputs
- Low phase noise and low spurs suitable for RF/microwave communications and test/measurement
- Power-management features including power-down/mode control
- Industrial temperature range with compact IC package (IUFD) for rugged, space-saving designs
Note: For exact electrical specifications (voltages, frequency range, jitter, SPi command set, and package pinout), please refer to the LTC6947IUFD datasheet.

Package

LTC6947IUFD is in an 8‑lead plastic package (SOIC‑8 / MSOP‑8). Industrial temperature range with Pb‑free / RoHS compliance.

Pinout

- Pin count: 32 pins (package LTC6947IUFD)
- Function: Wideband RF phase-locked loop (PLL) synthesizer with integrated VCO for LO generation in RF/microwave systems.

Manufacturer

Manufacturer: Analog Devices, Inc. (ADI). The LTC6947 originated from Linear Technology; ADI acquired Linear Technology in 2017, and now markets the part under Analog Devices.
About the company: Analog Devices is a multinational semiconductor company that designs and manufactures analog, mixed-signal, and DSP integrated circuits used across communications, instrumentation, automotive, industrial, and consumer electronics.

Application

Applications include:
- RF/microwave frequency synthesis and LO generation for wireless transceivers (cellular, Wi‑Fi, backhaul)
- Radar and microwave links
- Test and measurement equipment as precise programmable RF sources
- Software-defined radio and phased‑array systems
- Satellite/aerospace communications
- Instrumentation requiring low jitter and fractional‑N PLL with integrated VCO