STW81102AT

Clock Generators, PLLs, Frequency Synthesizers Overview

The STW81102AT is an integer-N RF frequency synthesizer with dual integrated VCOs, manufactured using a 0.35 µm SiGe BICMOS process. It operates on a 3.3V supply and features automatic center frequency calibration across 32 sub-bands. The device supports output frequencies from 750 MHz to 4650 MHz via direct, divide-by-2, or divide-by-4 outputs. Key electrical parameters include a lock time of 150 µs, a reference input range of 10–200 MHz, and a noise floor of -155 dBc/Hz. It includes a dual modulus prescaler (16/17 or 19/20), programmable charge pump current up to 5 mA, and digital lock detection.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Dual differential integrated VCOs with automatic center frequency calibration for wideband coverage
• Programmable feedback division ratio supporting high-frequency synthesis ranges
• Integrated digital lock detector and power-down mode for system control
• Dual digital bus interface supporting both SPI and I2C protocols

Clock Generators, PLLs, Frequency Synthesizers Applications

• 2.5G and 3G cellular infrastructure equipment
• CATV equipment
• Instrumentation and test equipment
• Wireless communication systems

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific ordering suffix 'AT' against the manufacturer's latest datasheet revision to confirm package type and tape-and-reel specifications. Confirm RoHS compliance status and moisture sensitivity level requirements before integration into the manufacturing flow. Check for any product change notifications that may affect pin compatibility or electrical characteristics.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this component when a multi-band RF synthesizer with integrated VCOs is required to reduce bill-of-materials count. Ensure the application frequency falls within the specified ranges: 750-905 MHz, 1000-1162.5 MHz, 1500-1810 MHz, 2000-2325 MHz, 3000-3620 MHz, or 4000-4650 MHz. Verify that the available digital interfaces (SPI/I2C) match the host controller capabilities.

Clock Generators, PLLs, Frequency Synthesizers Part Context

The STW81102 belongs to STMicroelectronics' family of multi-band RF frequency synthesizers designed as low-cost alternatives to discrete PLL and VCO solutions. It utilizes advanced SiGe technology to provide high performance and low power consumption in a compact VFQFPN28 package. This series targets wireless infrastructure applications requiring robust frequency generation.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should consult the manufacturer for current lifecycle status and potential obsolescence notices.