MAX9491ETP045+T

Clock Generators, PLLs, Frequency Synthesizers Overview

The MAX9491ETP045+T is a factory-programmable, single PLL clock generator designed for communication applications. It generates output frequencies from 4MHz to 200MHz using an integrated fractional-N PLL and a voltage-controlled crystal oscillator (VCXO). The device operates on a 3.3V supply with specified performance over the -40°C to +85°C temperature range. It features low RMS jitter of less than 13ps at 197MHz and accepts reference inputs between 5MHz and 50MHz. The component is housed in a 20-pin TQFN package.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Factory-programmable fractional-N PLL generating 4MHz to 200MHz outputs
• Integrated VCXO with ±200ppm tuning range via DC voltage input
• Low RMS jitter specification (< 13ps) at 197MHz output frequency
• Supports crystal or external clock references (5MHz to 50MHz)

Clock Generators, PLLs, Frequency Synthesizers Applications

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

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify that the specific ordering suffix matches the required factory preset frequency, as the OTP ROM is programmed based on customer requests prior to shipment. Confirm package availability and lead times directly with authorized distributors, as stock levels fluctuate. Ensure compliance with RoHS3 specifications during procurement.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this component when a fixed-frequency clock source is required without external programming logic. Verify that the target application frequency falls within the 4MHz to 200MHz range. Ensure the design accommodates the 3.3V power supply requirement and the thermal dissipation needs of the 20-TQFN package under maximum load conditions.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This part belongs to the MAX9491 family of clock generators. The 'ET' designation indicates the extended temperature range (-40°C to +85°C), while 'P' denotes the 20-pin TQFN package. The '045' suffix specifies the factory-set output frequency. Analog Devices acquired Maxim Integrated, which originally manufactured this series.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

No direct public substitute part numbers are confirmed in the provided documentation. Designers should evaluate other single-PLL clock generators from the manufacturer's portfolio if the MAX9491 is unavailable, ensuring compatibility with the 20-TQFN footprint and electrical parameters.