General Description

The MAX7400/MAX7403/MAX7404/MAX7407 8th-order,

lowpass, elliptic, switched-capacitor filters (SCFs) oper-

ate from a single +5V (MAX7400/MAX7403) or +3V

(MAX7404/MAX7407) supply. These devices draw 2mA

of supply current and allow corner frequencies from

1Hz to 10kHz, making them ideal for low-power anti-

aliasing and post-DAC filtering applications. They fea-

ture a shutdown mode that reduces the 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. In addition,

an offset adjustment pin (OS) allows for the adjustment

of the DC output level.

The MAX7400/MAX7404 provide 82dB of stopband

rejection and a sharp rolloff with a transition ratio of 1.5.

The MAX7403/MAX7407 provide a sharper rolloff with a

transition ratio of 1.2, while still delivering 60dB of stop-

band rejection. The fixed response of these devices

simplifies the design task to corner-frequency selection

by setting a clock frequency. The MAX7400/

MAX7403/MAX7404/MAX7407 are available in 8-pin SO

and DIP packages.

Applications

ADC Anti-Aliasing

Speech Processing

Post-DAC Filtering

Air-Bag Electronics

CT2 Base Stations

Features

o 8th-Order Lowpass Elliptic Filter

o Low Noise and Distortion

-82dB THD + Noise (MAX7400)

o Clock-Tunable Corner Frequency (1Hz to 10kHz)

o 100:1 Clock-to-Corner Ratio

o Single-Supply Operation

+5V (MAX7400/MAX7403)

+3V (MAX7404/MAX7407)

o Low Power

2mA (Operating Mode)

0.2µA (Shutdown Mode)

o Available in 8-Pin SO and DIP Packages

o Low Output Offset: ±5mV

8th-Order, Lowpass, Elliptic,

Switched-Capacitor Filters

________________________________________________________________

Maxim Integrated Products

1

VDD

IN

CLK

OUT

GND

INPUT

0.1

µF

0.1

µF

CLOCK

SHDN

OUTPUT

VSUPPLY

COM

OS

MAX7400

MAX7403

MAX7404

MAX7407

OS

OUT

VDD

1

2

8

7

CLK

SHDN

IN

GND

COM

SO/DIP

TOP VIEW

3

4

6

5

MAX7400

MAX7403

MAX7404

MAX7407

Typical Operating Circuit

19-4764; Rev 2; 6/99

Ordering Information continued at end of data sheet.

Pin Configuration

Ordering Information

Selector Guide

MAX7407

Elliptic (r = 1.2)

+3

PART

FILTER RESPONSE

OPERATING

VOLTAGE (V)

MAX7403

MAX7400

Elliptic (r = 1.5)

+5

Elliptic (r = 1.2)

+5

MAX7404

Elliptic (r = 1.5)

+3

PART

MAX7400CSA

MAX7400CPA

MAX7400ESA

-40°C to +85°C

0°C to +70°C

0°C to +70°C

TEMP. RANGE

PIN-PACKAGE

8 SO

8 Plastic DIP

8 SO

MAX7400EPA

-40°C to +85°C

8 Plastic DIP

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.

For small orders, phone 1-800-835-8769.