LMX2337MX

Clock Generators, PLLs, Frequency Synthesizers Overview

The LMX2337MX is a monolithic dual frequency synthesizer designed for RF personal communications. It integrates two high-frequency prescalers and operates within an input frequency range of 50 MHz to 550 MHz for both channels. The device supports a supply voltage from 2.7V to 5.5V with typical current consumption of 10 mA at 3V. It features selectable power-down modes reducing current to 1 µA, TRI-STATE charge pump options, and FastLock mode for rapid acquisition. The component utilizes a three-wire serial interface and is housed in a 16-pin surface mount package.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Dual channel architecture supporting independent RF phase-lock loops
• Configurable dual modulus prescaler offering 64/65 or 128/129 selection
• Integrated FastLock mode utilizing increased charge pump current for faster loop acquisition
• Selectable TRI-STATE charge pump output for reduced spurious emissions

Clock Generators, PLLs, Frequency Synthesizers Applications

• Cellular telephone systems (AMPS, ETACS, RCR-27)
• Cordless telephone systems (DECT, ISM, PHS, CT-1+)
• Personal Communication Systems (DCS-1800, PCN-1900)

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific ordering suffix against the manufacturer's documentation to confirm the package type and tape-and-reel configuration. Ensure that the component source matches the authorized distribution channels to guarantee authenticity. Confirm that the device meets the required environmental operating temperature specifications for the intended application environment before finalizing procurement.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this component when a low-power dual synthesizer solution is required for frequencies up to 550 MHz. The LMX2337MX is suitable for applications necessitating simultaneous generation of two stable local oscillator signals. Consider the available prescaler options and FastLock capabilities if rapid frequency switching is a critical design requirement for the target system.

Clock Generators, PLLs, Frequency Synthesizers Part Context

The LMX2337MX belongs to the PLLatinum family of dual frequency synthesizers, sharing architectural similarities with the LMX2335 and LMX2336. While the LMX2335 supports 1.1 GHz outputs and the LMX2336 supports 2.0 GHz on one channel, the LMX2337 is specifically optimized for lower frequency operations centered around 550 MHz. This differentiation allows designers to match the synthesizer performance precisely to their frequency band requirements.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

LMX2335MX

Clock Generators, PLLs, Frequency Synthesizers FAQ

What are the selectable dual modulus prescaler options?

The LMX2337MX allows the user to select between a 64/65 or a 128/129 dual modulus prescaler configuration.

How does the FastLock mode function?

FastLock mode increases the charge pump output current to four times the normal level and switches in a second damping resistor to ground, significantly reducing the time required for the loop to acquire lock.

What is the typical current consumption in active mode?

The typical power supply current for the LMX2337MX is 10 mA when operating at a supply voltage of 3V.