MAX7490EEE+

Overview

The MAX7490EEE+ is a dual universal switched-capacitor filter housed in a 16-pin QSOP package. It operates from a single +5V supply and supports an operating temperature range of -40°C to +85°C. The device features two identical low-power, rail-to-rail 2nd-order filter sections capable of generating bandpass, lowpass, highpass, and notch functions. It utilizes a fixed clock-to-center frequency ratio of 100:1, allowing center frequencies up to 40 kHz. Key electrical parameters include a Q accuracy of ±0.2%, a shutdown current of less than 1µA, and a maximum clock frequency of 4 MHz.

Feature Summary

• Dual 2nd-order filter sections providing simultaneous bandpass, lowpass, and notch outputs
• High-precision performance with ±0.2% Q and clock-to-center frequency accuracy
• Rail-to-rail input and output operation for wide dynamic range
• Low-power shutdown mode reducing supply current to under 1µA

Applications

• Tunable active filters
• Multipole filter cascading
• ADC anti-aliasing circuits
• Post-DAC filtering stages
• Phase-Locked Loops (PLLs)

Procurement Notes

Verify the specific suffix EEE against the manufacturer's ordering guide to confirm the industrial temperature range (-40°C to +85°C) and lead-free/RoHS compliance status. Ensure the design accommodates the single +5V supply requirement and 16-pin QSOP footprint. Cross-reference the datasheet revision history for any updates to electrical characteristics or pin configurations before finalizing procurement.

Selection Notes

Select the MAX7490EEE+ when a single +5V supply is available and industrial temperature coverage is required. Choose this part over the MAX7491 if the system voltage exceeds 3.6V. Consider the internal oscillator or external clock options based on the need for cutoff frequency precision versus component count reduction. Verify that the required filter topology matches one of the supported modes (Mode 1, 2, or 3).

Part Context

This component belongs to the MAX7490/MAX7491 family of dual universal switched-capacitor filters. The MAX7490 variant is specifically designed for +5V single-supply applications, whereas the MAX7491 operates at +3V. Both share identical pinouts and functional capabilities, differing primarily in supply voltage specifications and internal biasing resistor values.

Replacement Considerations

The MAX7490CEE+ serves as a commercial-grade alternative with a 0°C to +70°C temperature range. For systems requiring a +3V supply, the MAX7491EEE+ provides equivalent functionality within the same package.