MAX7426

19-1710; Rev 0; 4/00 5th-Order, Lowpass, Elliptic, Switched-Capacitor Filters General Description 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. o 5th-Order, Elliptic Lowpass Filters o Low Noise and Distortion: -80dB THD + Noise o Clock-Tunable Corner Frequency (1Hz to 12kHz) o Single-Supply Operation +5V (MAX7426) +3V (MAX7427) o Low Power 0.8mA (Operating Mode) 0.2µA (Shutdown Mode) o Available in 8-Pin µMAX/PDIP Packages o Low Output Offset: ±4mV Features MAX7426/MAX7427 Applications ADC Anti-Aliasing Post-DAC Filtering CT2 Base Stations Speech Processing PART MAX7426CUA MAX7426CPA MAX7426EUA MAX7426EPA MAX7427CUA MAX7427CPA MAX7427EUA MAX7427EPA Ordering Information TEMP. RANGE 0°C to +70°C 0°C to +70°C -40°C to +85°C -40°C to +85...