MAX2451CSE

Overview

The MAX2451CSE is a monolithic quadrature demodulator featuring an integrated oscillator and divide-by-8 prescaler. It operates from a single +3V supply with a typical operating current of 5.5mA and a shutdown current of 2µA. The device accepts IF signals in the 35MHz to 80MHz range, terminated by a 400Ω thin-film resistor for external filter matching. It provides 51dB voltage conversion gain and outputs fully differential baseband signals with 1.2Vp-p swings. The baseband output bandwidth extends up to 9MHz.

Feature Summary

• Integrated quadrature phase shifters and on-chip oscillator requiring external tuning
• On-chip divide-by-8 prescaler supporting direct frequency division
• Fully differential baseband outputs with specified signal swing capabilities
• CMOS-compatible enable pin for power management control

Applications

• Digital cordless phones
• GSM cellular phones
• North American cellular phones
• Wireless LANs
• Digital communications pagers

Procurement Notes

Verify component status as the MAX2451 series is listed as obsolete in official records. Confirm availability through authorized distributors or surplus channels. Ensure the SOP-16 package matches design requirements. Validate datasheet revisions for any specific handling or testing procedures associated with legacy Maxim Integrated products before integration.

Selection Notes

Select this component for low-power quadrature demodulation applications requiring integrated frequency division. The 3V operation suits battery-powered portable devices. Consider the 35MHz to 80MHz IF input range when designing front-end filtering. The 400Ω input termination simplifies impedance matching to standard IF filters. Evaluate the 9MHz baseband bandwidth against required data rates.

Part Context

The MAX2451 belongs to the MAX245x family of ultra-low-power RF transceivers developed by Maxim Integrated. It serves as the demodulation counterpart to modulators like the MAX2450. This series targets cost-sensitive wireless communication markets, providing complete quadrature signal processing in a compact surface-mount package. The CSE suffix indicates a commercial temperature range and SOP-16 packaging.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. As the product lifecycle is marked obsolete, direct replacements may require functional equivalence analysis. Designers should consult updated Maxim Integrated portfolios for modern alternatives with similar IF ranges and power specifications.