8th-Order, Lowpass, Bessel, Switched-Capacitor Filters

The MAX7401/MAX7405 8th-order, lowpass, Bessel, switched-capacitor filters (SCFs) operate from a single +5V (MAX7401) or +3V (MAX7405) supply. These devices draw only 2mA of supply current and allow corner frequencies from 1Hz to 5kHz, making them ideal for low-power post-DAC filtering and anti-aliasing applications. They feature a shutdown mode that reduces supply current to 0.2µA.

Two clocking options are available on these devices: self-clocking (through the use of an external capacitor) or external clocking for tighter corner-frequency control. An offset adjust pin allows for adjustment of the DC output level.

The MAX7401/MAX7405 Bessel filters provide low overshoot and fast settling. Their fixed response simplifies the design task to selecting a clock frequency.

Applications

* ADC Anti-Aliasing * Air-Bag Electronics * CT2 Base Stations * Post-DAC Filtering * Speech Processing

* 8th-Order, Lowpass Bessel Filters

* Low Noise and Distortion: -82dB THD + Noise

* Clock-Tunable Corner Frequency (1Hz to 5kHz)

* 100:1 Clock-to-Corner Ratio

* Single-Supply Operation

* +5V (MAX7401)

* +3V (MAX7405)

* Low Power

* 2mA (Operating Mode)

* 0.2µA (Shutdown Mode)

* Available in 8-Pin SO/DIP Packages

* Low Output Offset: ±5mV