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MAX7426：5th-Order, Lowpass, Elliptic, Switched-Capacitor Filters

Industry's Lowest-Power and Industry's Smallest 5th-Order Lowpass Filters

The MAX7426/MAX7427 5th-order, lowpass, elliptic, switched-capacitor filters (SCFs) operate from a single +5V (MAX7426) or +3V (MAX7427) supply. The devices draw only 0.8mA of supply current and allow corner frequencies from 1Hz to 12kHz, making them ideal for low-power post-DAC filtering and anti-aliasing applications. They can be put into a low-power mode, reducing supply current to 0.2µA. Two clocking options are available: self-clocking (through the use of an external capacitor) or external clocking for tighter cutoff-frequency control. An offset-adjust pin allows for adjustment of the DC output level. The MAX7426/MAX7427 deliver 37dB of stopband rejection and a sharp rolloff with a transition ratio of 1.25. Their fixed response limits the design task to selecting a clock frequency.

Key Features 5th-Order, Elliptic Lowpass Filters Low Noise and Distortion: -80dB THD + Noise Clock-Tunable Corner Frequency (1Hz to 12kHz) Single-Supply Operation +5V (MAX7426) +3V (MAX7427) Low Power 0.8mA (Operating Mode) 0.2µA (Shutdown Mode) Available in 8-Pin µMAX®/PDIP Packages Low Output Offset: ±4mV

MAX7426, MAX7427: Typical Operating Circuit Applications/Uses ADC Anti-Aliasing Filter Post-DAC Filtering Speech Processing

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Related Products

• MAX7411：5th Order, Lowpass, Elliptic, Switched-Capacitor Filters
• MAX7415：5th Order, Lowpass, Elliptic, Switched-Capacitor Filters

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