MAX7480EPA+

Overview

The MAX7480EPA+ is an 8th-order, lowpass, Butterworth switched-capacitor filter (SCF) designed for single +5V supply operation. It provides a maximally flat passband response with a clock-to-corner frequency ratio of 100:1, allowing corner frequencies from 1Hz to 2kHz. The device features a shutdown mode that reduces supply current to 0.2µA, compared to 2.9mA in operating mode. It offers low noise and distortion (-73dB THD+N) and includes an offset adjust pin for DC output level tuning. Available in an 8-pin Plastic DIP package, it operates within a temperature range of -40°C to +85°C.

Feature Summary

• 8th-Order Lowpass Butterworth Filter
• Clock-Tunable Corner Frequency (1Hz to 2kHz)
• Low Power Shutdown Mode
• Low Output Offset

Applications

• ADC Anti-Aliasing
• Post-DAC Filtering

Procurement Notes

Verify the component authenticity by checking the manufacturer markings against official documentation. Confirm the specific ordering suffix matches the required package type and temperature rating. Ensure the supplier provides valid traceability records. Cross-reference the part number with the latest Analog Devices or Maxim Integrated catalogs to confirm availability status.

Selection Notes

Select this component when a high-order, low-power analog filter is required for instrumentation applications. The fixed Butterworth response simplifies design by eliminating complex pole-zero calculations. Consider the internal oscillator option if external clocking is not feasible, utilizing the 100:1 ratio for precise corner frequency setting via a single capacitor.

Part Context

The MAX7480 belongs to the family of switched-capacitor filters from Maxim Integrated. Unlike cascaded biquad designs, it emulates a passive ladder network, resulting in lower sensitivity to component variations. This architecture distributes errors across all poles rather than concentrating them, providing stable performance in precision signal conditioning tasks.

Replacement Considerations

Direct replacements include the MAX7480ESA for surface mount applications. Verify compatibility regarding pinout, supply voltage requirements, and thermal characteristics before substitution.