General Description

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 stop band 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.

特性 Features

? 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

Applications

?? ADC Anti-Aliasing

?? Speech Processing

?? Post-DAC Filtering

?? Air-Bag Electronics

?? CT2 Base Stations