LTC6947IUFD

The LTC6947IUFD is an Analog Devices Linear Technology high‑performance clock/frequency synthesizer IC. It’s used to generate precise RF/clock signals from a reference, typically featuring a PLL with programmable division/multiplication, low jitter, and wide frequency range suitable for RF transceivers, SERDES, clocking, and test equipment. The suffix IUFD denotes the device’s packaging and ratings (industrial temperature, RoHS/Pb‑free variant in a specific package type). For exact specs, interfaces (SPI/I2C), pinout, and programming, refer to the LTC6947 datasheet and the IUFD package documentation.

There isn’t a direct one‑for‑one substitute for LTC6947IUFD. Closest equivalents are other wideband fractional‑N PLL synthesizers with integrated VCO from major vendors, for example:
- Analog Devices: ADF4350/ADF4351 (and ADF5600 family)
- TI: LMX2571/LMX2582/LMX2594
Check exact specs (frequency range, reference input, VCO range, packaging) and use distributor cross‑reference tools for current substitutes.

Key features of LTC6947IUFD (Analog Devices Linear Technology):
- Fully integrated wideband fractional-N frequency synthesizer
- SPI-compatible serial control interface
- Programmable reference divider and feedback divider
- Supports integer-N and fractional-N operation for fine frequency steps
- Programmable loop parameters (charge-pump current, loop filter guidance)
- Low phase noise and low spur performance with fast lock time
- Single-supply operation with modest power consumption
- Small 8-pin IUFD package (RoHS compliant)

Pin count: 28 pins.
Function: A high-performance phase‑locked loop (PLL) based frequency synthesizer/clock generator used to generate stable RF/clock signals (fractional-N capability available in the family).

The LTC6947IUFD is manufactured by Analog Devices, Inc. (ADI). Analog Devices is an American multinational semiconductor company that designs and manufactures analog, mixed-signal, and digital signal processing integrated circuits. It acquired Linear Technology in 2017, so LTC parts are now offered under the Analog Devices umbrella.

Possible application areas for LTC6947IUFD:
- Wideband RF/microwave LO synthesis for transceivers (cellular, satcom, point-to-point, mmWave)
- Fractional-N PLL-based frequency synthesis for wireless front-ends
- LO sources for radar, navigation, and test equipment
- Clock generation and distribution for high-speed ADC/DACs and DSPs
- Instrumentation signal generators and reference oscillators
- Rugged RF/microwave systems in automotive, aerospace, and military applications
Note: Use-case fit depends on the device’s frequency range, phase noise, and programming capabilities.

32‑lead QFN (LFCSP) package, RoHS compliant (lead-free).