MAX7490CEE+

Overview

The MAX7490CEE+ is a dual universal switched-capacitor filter housed in a 16-pin QSOP package. It operates from a single +5V supply within a voltage range of 4.5V to 5.5V and supports an operating temperature range of 0°C to +70°C. The device contains two identical low-power, rail-to-rail 2nd-order filter sections capable of generating bandpass, lowpass, highpass, and notch functions simultaneously using external resistors. It features a clock-to-center frequency ratio of 100:1, with a center frequency range up to 40kHz. Key electrical specifications include Q accuracy of ±0.2%, a shutdown current of less than 1µA, and a maximum clock frequency of 4MHz.

Feature Summary

• Dual 2nd-order filter sections providing simultaneous bandpass, lowpass, highpass, and notch outputs
• Internal rail splitter for precise common-mode voltage establishment in single-supply operation
• Supports both internal oscillator and external clocking options for cutoff frequency control
• 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
• Adaptive filtering systems

Procurement Notes

Verify the specific suffix CEE against the manufacturer's ordering information to confirm the commercial temperature range (0°C to +70°C) and lead-free/RoHS compliance status. Ensure the design utilizes the correct +5V supply voltage, as the MAX7491 variant requires +3V. Confirm pin compatibility with the 16-pin QSOP footprint during PCB layout.

Selection Notes

Select this component when dual independent filter channels are required in a compact surface-mount package. Choose between internal or external clocking based on the need for cutoff frequency precision versus circuit simplicity. Verify that the required center frequency falls within the 40kHz limit and that the system can accommodate the necessary external resistor network for the desired filter topology.

Part Context

This part 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 their power supply requirements and internal biasing characteristics optimized for their respective voltage levels.

Replacement Considerations

The MAX7490EEE+ serves as a direct replacement offering the same functionality but extended to an industrial temperature range of -40°C to +85°C. No other cross-model substitutes are documented.