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MAX7421 Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX7421 Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 14 page For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. General Description The MAX7418–MAX7425 5th-order, low-pass, switched- capacitor filters (SCFs) operate from a single +5V (MAX7418–MAX7421) or +3V (MAX7422–MAX7425) supply. These devices draw only 3mA of supply current and allow corner frequencies from 1Hz to 45kHz, mak- ing 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: 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 MAX7418/MAX7422 deliver 53dB of stopband rejection and a sharp rolloff with a 1.6 transition ratio. The MAX7421/MAX7425 achieve a sharper rolloff with a 1.25 transition ratio while still providing 37dB of stop- band rejection. The MAX7419/MAX7423 Bessel filters provide low overshoot and fast settling, and the MAX7420/MAX7424 Butterworth filters provide a maxi- mally flat passband response. Their fixed response sim- plifies the design task of selecting a clock frequency. Applications ADC Anti-Aliasing CT2 Base Stations DAC Postfiltering Speech Processing Features o 5th-Order, Lowpass Filters Elliptic Response (MAX7418/MAX7421/ MAX7422/MAX7425) Bessel Response (MAX7419/MAX7423) Butterworth Response (MAX7420/MAX7424) o Clock-Turnable Corner Frequency (1Hz to 45kHz) o Single-Supply Operation +5V (MAX7418–MAX7421) +3V (MAX7422–MAX7425) o Low Power 3mA (Operating Mode) 0.2µA (Shutdown Mode) o Available in 8-Pin µMAX Package o Low Output Offset: ±4mV 5th-Order, Lowpass, Switched-Capacitor Filters ________________________________________________________________ Maxim Integrated Products 1 OS OUT VDD 1 2 8 7 CLK SHDN IN GND COM µMAX TOP VIEW 3 4 6 5 MAX7418– MAX7425 VDD IN CLK OUT GND INPUT 0.1 µF 0.1 µF CLOCK SHDN OUTPUT VSUPPLY COM OS MAX7418– MAX7425 Typical Operating Circuit 19-1821; Rev 0; 11/00 Pin Configuration Ordering Information Selector Guide PART MAX7418EUA -40°C to +85°C TEMP. RANGE PIN-PACKAGE 8 µMAX Selector Guide continued at end of data sheet. Ordering Information continued at end of data sheet. MAX7418CUA 0°C to +70°C 8 µMAX MAX7419CUA 0°C to +70°C 8 µMAX MAX7419EUA -40°C to +85°C 8 µMAX MAX7420CUA 0°C to +70°C 8 µMAX MAX7420EUA -40°C to +85°C 8 µMAX MAX7421CUA 0°C to +70°C 8 µMAX MAX7421EUA -40°C to +85°C 8 µMAX PART FILTER RESPONSE OPERATING VOLTAGE (V) MAX7418 r = 1.6 +5 MAX7419 Bessel +5 MAX7420 Butterworth +5 MAX7421 r = 1.25 +5 |
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