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The MAX7400/MAX7403/MAX7404/MAX7407 8th-order, lowpass, elliptic, switched-capacitor filters (SCFs) operate from a single +5V (MAX7400/MAX7403) or +3V (MAX7404/MAX7407) supply. These devices draw 2mA of supply current and allow corner frequencies from 1Hz to 10kHz, making them ideal for low-power anti-aliasing and post-DAC filtering applications. They feature a shutdown mode that reduces the 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. In addition, an offset adjustment pin (OS) allows for the adjustment of the DC output level.

The MAX7400/MAX7404 provide 82dB of stopband rejection and a sharp rolloff with a transition ratio of 1.5. The MAX7403/MAX7407 provide a sharper rolloff with a transition ratio of 1.2, while still delivering 60dB of stopband rejection. The fixed response of these devices simplifies the design task to corner-frequency selection by setting a clock frequency. The MAX7400/MAX7403/MAX7404/MAX7407 are available in 8-pin SO and DIP packages.

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8th-Order Lowpass Elliptic Filter

Low Noise and Distortion -82dB THD + Noise (MAX7400)

Clock-Tunable Corner Frequency (1Hz to 10kHz)

100:1 Clock-to-Corner Ratio

Single-Supply Operation

• +5V (MAX7400/MAX7403)
• +3V (MAX7404/MAX7407)

Low Power

• 2mA (Operating Mode)
• 0.2μA (Shutdown Mode)

Available in 8-Pin SO and DIP Packages

Low Output Offset: ±5mV