MAX7408

19-1378; Rev 1; 10/98 5th-Order, Lowpass, Elliptic, Switched-Capacitor Filters General Description The MAX7408/MAX7411/MAX7412/MAX7415 5th-order, lowpass, elliptic, switched-capacitor filters (SCFs) operate from a single +5V (MAX7408/MAX7411) or +3V (MAX7412/MAX7415) supply. The devices draw only 1.2mA of supply current and allow corner frequencies from 1Hz to 15kHz, 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 MAX7408/MAX7412 deliver 53dB of stopband rejection and a sharp rolloff with a transition ratio of 1.6. The MAX7411/MAX7415 achieve a sharper rolloff with a transition ratio of 1.25 while still providing 37dB of stopband rejection. Their fixed response limits the design task to selecting a clock frequency. o 5th-Order, Elliptic Lowpass Filters o Low Noise and Distortion: -80dB THD + Noise o Clock-Tunable Corner Frequency (1Hz to 15kHz) o Single-Supply Operation +5V (MAX7408/MAX7411) +3V (MAX7412/MAX7415) o Low Power 1.2mA (operating mode) 0.2µA (shutdown mode) o Available in 8-Pin µMAX/DIP Packages o Low Output Offset: ±4mV Features MAX7408/MAX7411/MAX7412/MAX7415 Ordering Information PART MAX7408CPA MAX7408CUA MAX7408EPA MAX7408EUA MAX74...