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, making

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 stopband

rejection. The MAX7419/MAX7423 Bessel filters pro-

vide 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.

Features

● 5th-Order, Lowpass Filters

• Elliptic Response

(MAX7418/MAX7421/MAX7422/MAX7425)

• Bessel Response (MAX7419/MAX7423)

• Butterworth Response (MAX7420/MAX7424)

● Clock-Turnable Corner Frequency (1Hz to 45kHz)

● Single-Supply Operation

• +5V (MAX7418–MAX7421)

• +3V (MAX7422–MAX7425)

● Low Power

• 3mA (Operating Mode)

• 0.2μA (Shutdown Mode)

● Available in 8-Pin μMAX Package

● Low Output Offset: ±4mV

● ADC Anti-Aliasing

● DAC Postfiltering

● CT2 Base Stations

● Speech Processing

Ordering Information continued at end of data sheet.

Selector Guide continued at end of data sheet.

19-1821; Rev 2; 8/22

PART

TEMP RANGE

PIN-PACKAGE

MAX7418CUA

0°C to +70°C

8 μMAX

MAX7418EUA

-40°C to +85°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

5th-Order, Lowpass,

Switched-Capacitor Filters

MAX7418–MAX7425

Design

Resources

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Pin Configuration

Typical Operating Circuit

Ordering Information

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

0.1µF

0.1µF

CLOCK

SHDN

OUTPUT

VSUPPLY

COM

OS

MAX7418–

MAX7425

PART

FILTER RESPONSE

OPERATING

VOLTAGE (V)

MAX7418

r = 1.6

+5

MAX7419

Bessel

+5

MAX7420

Butterworth

+5

MAX7421

r = 1.25

+5

Selector Guide

Applications