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MAX7420

Maxim Integrated
Part Number MAX7420
Manufacturer Maxim Integrated
Description 5th-Order / Lowpass / Switched-Capacitor Filters
Published Jan 9, 2016
Detailed Description 19-1821; Rev 0; 11/00 MAX7418–MAX7425 5th-Order, Lowpass, Switched-Capacitor Filters General Description The MAX7418–...
Datasheet PDF File MAX7420 PDF File

MAX7420
MAX7420

Overview
19-1821; Rev 0; 11/00 MAX7418–MAX7425 5th-Order, Lowpass, Switched-Capacitor Filters General Description The MAX7418–MAX7425 5th-order, low-pass, switchedcapacitor 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, making them ideal for low-power post-DAC filtering and antialiasing 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 stopband rejection.
The MAX7419/MAX7423 Bessel filters provide low overshoot and fast settling, and the MAX7420/MAX7424 Butterworth filters provide a maximally flat passband response.
Their fixed response simplifies the design task of selecting a clock frequency.
Applications ADC Anti-Aliasing DAC Postfiltering CT2 Base Stations Speech Processing Selector Guide PART FILTER RESPONSE OPERATING VOLTAGE (V) MAX7418 r = 1.
6 +5 MAX7419 Bessel +5 MAX7420 Butterworth +5 MAX7421 r = 1.
25 +5 Selector Guide continued at end of data sheet.
Pin Configuration TOP VIEW COM 1 IN 2 GND 3 VDD 4 MAX7418– MAX7425 8 CLK 7 SHDN 6 OS 5 OUT 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 Ordering Informatio...


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