MAX9491ETP095+

Clock Generators, PLLs, Frequency Synthesizers Overview

The MAX9491ETP095+ is a factory-programmable, single PLL clock generator designed for communication applications. It operates from a +3.3V supply and supports an extended temperature range of -40°C to +85°C. The device features a fractional-N PLL with a buffered output capable of generating frequencies between 4MHz and 200MHz. An integrated voltage-controlled crystal oscillator (VCXO) provides a tuning range of ±200ppm, controlled via a DC voltage input. The unit utilizes one-time programmable ROM for frequency configuration and is housed in a 20-pin TQFN package.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Factory-programmable fractional-N PLL generates outputs from 4MHz to 200MHz
• Integrated VCXO with ±200ppm typical tuning range via DC voltage
• Low RMS jitter performance (< 13ps at 197MHz)
• Operates on +3.3V supply within -40°C to +85°C temperature range

Clock Generators, PLLs, Frequency Synthesizers Applications

• Telecommunications systems
• Data networking equipment
• Home entertainment centers
• Small office/home office (SOHO) infrastructure

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific OTP frequency configuration matches the design requirements, as the internal ROM is factory preset based on customer requests. Confirm the 20-pin TQFN package variant is selected for the target PCB layout. Ensure power supply decoupling capacitors are placed close to the VDD and VDDA pins to maintain signal integrity and stability during operation.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this component when a precise, factory-set clock frequency is required without external programming overhead. The integrated VCXO makes it suitable for applications needing fine frequency adjustments. Ensure the reference input frequency falls within the specified 5MHz to 50MHz range if using an external clock, or utilize the internal oscillator with a 27MHz AT-cut crystal.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This part belongs to the MAX9491 family of multipurpose clock generators. The ETP suffix indicates the 20-lead TQFN-EP package with an exposed paddle for thermal management. Other variants include the 14-lead TSSOP version. The device is manufactured by Maxim Integrated, now part of Analog Devices Inc., targeting high-reliability timing solutions.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Direct pin-compatible replacements within the same family include the MAX9491EUD in a 14-pin TSSOP package, though pin counts differ. Cross-family replacements require verification of PLL architecture, supply voltage compatibility (+3.3V), and package dimensions. No other specific substitute part numbers are documented in the provided datasheet.