Maxim > Products > Filters (Analog) > MAX293, MAX294, MAX297

MAX293, MAX294, MAX297

8th-Order, Lowpass, Elliptic, Switched-Capacitor Filters

Also See MAX7400/3/4/7 for Lowest-Power Applications
 Overview   Technical Documents   Ordering Info   Related Products   User Comments (0)   All   


Status Explanations for product status codes

Active: In Production.

Description

The MAX293/MAX294/MAX297 are easy-to-use, 8th-order, lowpass, elliptic, switched-capacitor filters that can be set up with corner frequencies from 0.1Hz to 25kHz (MAX293/MAX294) or from 0.1Hz to 50kHz (MAX297).

The MAX293/MAX297's 1.5 transition ratio provides sharp rolloff and -80dB of stopband rejection. The MAX294's 1.2 transition ratio provides the steepest rolloff and -58dB of stopband rejection. All three filters have fixed responses, so the design task is limited to selecting the clock frequency that controls the filter's corner frequency.

An external capacitor is used to generate a clock using the internal oscillator, or an external clock signal can be used. An uncommitted op amp (noninverting input grounded) is provided for building a continuous-time lowpass filter for post-filtering or anti-aliasing. Steep rolloff and high order make these filters ideal for anti-aliasing applications that require maximum bandwidth, and for communication applications that require filtering signals in close proximity within the frequency domain.

The MAX293/MAX294/MAX297 are available in 8-pin DIP and 16-pin wide SO packages, delivering aggressive performance from a tiny area.
 

Data Sheet

Download this datasheet in PDF formatDownload Rev 2 (PDF, 2.2MB)
Send this datasheet to any email addressE-Mail

My Maxim: Not Logged In
By logging in to My Maxim you can subscribe to alerts for this data sheet.

Login | Register

Key Features

  • 8th-Order Lowpass Elliptic Filters
  • Clock-Tunable Corner-Frequency Range:
    • 0.1Hz to 25kHz (MAX293/MAX294)
    • 0.1Hz to 50kHz (MAX297)
  • No External Resistors or Capacitors Required
  • Internal or External Clock
  • Clock to Corner Frequency Ratio
    • 100:1 (MAX293/MAX294)
    • 50:1 (MAX297)
  • Operate with a Single +5V Supply or Dual ±5V Supplies
  • Uncommitted Op Amp for Anti-Aliasing or Clock-Noise Filtering
  • 8-Pin DIP and 16-Pin Wide SO Packages
 

Applications/Uses

  • Anti-Aliasing
  • DAC Post-Filtering
  • Data-Acquisition Systems
  • Voice/Data Signal Filtering
   

Key Specifications:

Active Filters
Part Number Filter Sections Order Per Filter Section Filter Class Filter Type Filter Characteristic Program Method Lowest Cutoff
(Hz)		 Highest Cutoff
(kHz)		 VSUPPLY (Dual)
(±V)		 VSUPPLY
(V)		 Oper. Temp.
(°C)		 Budgetary Price
max min Dual See Notes
MAX293  1 8 Switched Cap Lowpass Elliptic Clock 0.1 25 5 5
-55 to +125
-40 to +85
0 to +70
 $3.88 @1k
MAX294  25 $3.88 @1k
MAX297  50 $3.88 @1k
See All Active Filters (50)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.


Diagram

MAX293, MAX294, MAX297: Typical Operating Circuit
Typical Operating Circuit

Application Notes

Application Note 1904   Telephone Tone Generator Requires No Trimming
Application Note 4504   Locked-Sync Sine Generator Covers Three Decades with Low Distortion

Product Guides

Signal Routing & Protection (PDF)

Reliability Reports

Reliability Report: MAX293.pdf MAX294.pdf MAX297.pdf
Show FIT data for:

Software/Models

none

Ordering Information

Filters: Part Number: Package: Temperature: Tape and Reel Sample
Devices: 51-66 / 66 <-- Previous   1 2  Next -->
Part Number Free
Sample		 Buy Status Explanations for product status codes Package:
TYPE PINS FOOTPRINT
DRAWING  CODE/VAR * 		Temp RoHS/Lead-Free?
Materials Analysis
MAX297CSA-T    
Active N.SO;8 pin

Land Pattern: Not Available

0°C to +70°C See data sheet
MAX297CWE    
Active SOIC(W);16 pin;111.8 mm²
Outline Drawing:21-0042 (PDF)
Land Pattern: 90-0107 (PDF)
Use pkgcode/variation: W16-1*
0°C to +70°C RoHS/Lead-Free: No
Materials Analysis
MAX297CWE+  
Active SOIC(W);16 pin;111.8 mm²
Outline Drawing:21-0042 (PDF)
Land Pattern: 90-0107 (PDF)
Use pkgcode/variation: W16+1*
0°C to +70°C RoHS/Lead-Free: Lead Free
Materials Analysis
MAX297CWE+T    
Active SOIC(W);16 pin;111.8 mm²
Outline Drawing:21-0042 (PDF)
Land Pattern: 90-0107 (PDF)
Use pkgcode/variation: W16+1*
0°C to +70°C RoHS/Lead-Free: Lead Free
Materials Analysis
MAX297CWE-T    
Active W.SO;16 pin

Land Pattern: Not Available

0°C to +70°C See data sheet
MAX297EPA    
Active PDIP(N);8 pin;79.7 mm²
Outline Drawing:21-0043 (PDF)
Land Pattern: Not Applicable
Use pkgcode/variation: P8-2*
-40°C to +85°C RoHS/Lead-Free: No
Materials Analysis
MAX297EPA+  
Active PDIP(N);8 pin;79.7 mm²
Outline Drawing:21-0043 (PDF)
Land Pattern: Not Applicable
Use pkgcode/variation: P8+2*
-40°C to +85°C RoHS/Lead-Free: Lead Free
Materials Analysis
MAX297ESA    
Active SOIC(N);8 pin;30.9 mm²
Outline Drawing:21-0041 (PDF)
Land Pattern: 90-0096 (PDF)
Use pkgcode/variation: S8-5*
-40°C to +85°C RoHS/Lead-Free: No
Materials Analysis
MAX297ESA+  
Active SOIC(N);8 pin;30.9 mm²
Outline Drawing:21-0041 (PDF)
Land Pattern: 90-0096 (PDF)
Use pkgcode/variation: S8+5*
-40°C to +85°C RoHS/Lead-Free: Lead Free
Materials Analysis
MAX297ESA+T    
Active N.SO;8 pin

Land Pattern: Not Available

-40°C to +85°C See data sheet
Part Number Free
Sample		 Buy Status Explanations for product status codes Package:
TYPE PINS FOOTPRINT
DRAWING  CODE/VAR * 		Temp RoHS/Lead-Free?
Materials Analysis
MAX297ESA-T    
Active N.SO;8 pin

Land Pattern: Not Available

-40°C to +85°C See data sheet
MAX297EWE    
Active SOIC(W);16 pin;111.8 mm²
Outline Drawing:21-0042 (PDF)
Land Pattern: 90-0107 (PDF)
Use pkgcode/variation: W16-1*
-40°C to +85°C RoHS/Lead-Free: No
Materials Analysis
MAX297EWE+  
Active SOIC(W);16 pin;111.8 mm²
Outline Drawing:21-0042 (PDF)
Land Pattern: 90-0107 (PDF)
Use pkgcode/variation: W16+1*
-40°C to +85°C RoHS/Lead-Free: Lead Free
Materials Analysis
MAX297EWE+T    
Active SOIC(W);16 pin;111.8 mm²
Outline Drawing:21-0042 (PDF)
Land Pattern: 90-0107 (PDF)
Use pkgcode/variation: W16+1*
-40°C to +85°C RoHS/Lead-Free: Lead Free
Materials Analysis
MAX297EWE-T    
Active SOIC(W);16 pin;111.8 mm²
Outline Drawing:21-0042 (PDF)
Land Pattern: 90-0107 (PDF)
Use pkgcode/variation: W16-1*
-40°C to +85°C RoHS/Lead-Free: No
Materials Analysis
MAX297MJA    
Active CDIP(N);8 pin;82.6 mm²
Outline Drawing:21-0045 (PDF)
Land Pattern: Not Applicable
Use pkgcode/variation: J8-2*
-55°C to +125°C RoHS/Lead-Free: No
Materials Analysis
Devices: 51-66 / 66 <-- Previous   1 2  Next -->

Notes:
  1. Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
  2. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
  3. Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product Naming Conventions.
  4. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

Notes and Comments

Single 8th-order, elliptic, switched-capacitor filter

Similar Products by Function

MAX7400, MAX7403, MAX7404, ... 8th-Order, Lowpass, Elliptic, Switched-Capacitor Filters
MAX7408, MAX7411, MAX7412, ... 5th Order, Lowpass, Elliptic, Switched-Capacitor Filters
See All Active Filters (50 Products)


Didn't Find What You Need?

Next Day Product Selection Assistance from Applications Engineers
Parametric Search
Applications Help

Information Index

Overview

  

Technical Documents

  

Ordering Info

  

Related Products

  
Description
Key Features
Applications/Uses
Key Specifications
Diagram
Notes and Comments
  Data Sheet
Application Notes
Evaluation Kits
Product Guides
Reliability Reports
Software/Models
  Price and Availability
Samples
Buy Online
Package Information
Lead-Free Information
  Similar Products by Function
Similar Products by Application
Evaluation Kits
Products with Similar Part Numbers
Products Used With This
 
Document Ref.: 19-0020 Rev 2; 2008-08-07
This page last modified: 2011-02-14

 


Contact Us     |     Privacy Policy     |     Legal Notices     |     Distributor Portal
Copyright © 2012 by Maxim Integrated Products