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Maxim > Products > [Filters (Analog)] 
MAX293, MAX294, MAX297
8th-Order, Lowpass, Elliptic, Switched-Capacitor Filters

Also See MAX7400/3/4/7 for Lowest-Power Applications


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Status
Active: In Production.

Data Sheet
FULL DATA SHEET (PDF, 2.2MB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail

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 50Hz (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.

Key Features   Applications/Uses
  • 8th-Order Lowpass Elliptic Filters
  • Clock-Tunable Corner-Frequency Range:
    • 0.1Hz to 25Hz (MAX293/MAX294)
    • 0.1Hz to 50Hz (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

 
  		• 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)    		 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
    		 $3.18 @1k
    MAX294  25 $3.18 @1k
    MAX297  50 $3.18 @1k
    See All Active Filters (50)

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

    Application Notes
  		• Application Note 1904: Telephone Tone Generator Requires No Trimming - MAX293

    Design Guides
  		• Signal Routing & Protection (PDF)

    Reliability Reports
  		• Reliability Report: MAX293.pdf MAX294.pdf
  		• Show FIT data for:
  		• Request Reliability Report for:

    Software/Models
    none

    Ordering Information
    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. More: SeeFull Data Sheet or Part 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.


    Devices: 1-66 of 66

    MAX293 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX293MJA    
    		Active CDIP(N);8 pin;83 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
    MAX293C/D    
    		Active DICE SALES;NA pin;0 mm²

    Land Pattern: Not Applicable
    Use pkgcode/variation: DICE*
    		See data sheet
    MAX293CPA    
    		Active PDIP(N);8 pin;80 mm²
    Outline Drawing: 21-0043 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: P8-2*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX293CPA+  
    		Active PDIP(N);8 pin;80 mm²
    Outline Drawing: 21-0043 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: P8+2*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX293EPA    
    		Active PDIP(N);8 pin;80 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
    MAX293EPA+  
    		Active PDIP(N);8 pin;80 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
    MAX293CWE    
    		Active SOIC(W);16 pin;112 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
    MAX293CWE-T    
    		Active

    Land Pattern: Not Available

    		0°C to +70°C See data sheet
    MAX293CWE+  
    		Active SOIC(W);16 pin;112 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
    MAX293CWE+T    
    		Active SOIC(W);16 pin;112 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
    MAX293EWE    
    		Active SOIC(W);16 pin;112 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
    MAX293EWE-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX293EWE+  
    		Active SOIC(W);16 pin;112 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
    MAX293EWE+T    
    		Active SOIC(W);16 pin;112 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
    MAX293CSA    
    		Active SOIC(N);8 pin;31 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0096 (PDF)
    Use pkgcode/variation: S8-5*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX293CSA-T    
    		Active

    Land Pattern: Not Available

    		0°C to +70°C See data sheet
    MAX293CSA+  
    		Active SOIC(N);8 pin;31 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0096 (PDF)
    Use pkgcode/variation: S8+5*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX293CSA+T    
    		Active SOIC(N);8 pin;31 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0096 (PDF)
    Use pkgcode/variation: S8+5*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX293ESA    
    		Active SOIC(N);8 pin;31 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
    MAX293ESA-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX293ESA+  
    		Active SOIC(N);8 pin;31 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
    MAX293ESA+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX294 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX294MJA    
    		Active CDIP(N);8 pin;83 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
    MAX294C/D    
    		Active DICE SALES;NA pin;0 mm²

    Land Pattern: Not Applicable
    Use pkgcode/variation: DICE*
    		See data sheet
    MAX294CPA    
    		Active PDIP(N);8 pin;80 mm²
    Outline Drawing: 21-0043 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: P8-2*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX294CPA+  
    		Active PDIP(N);8 pin;80 mm²
    Outline Drawing: 21-0043 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: P8+2*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX294EPA    
    		Active PDIP(N);8 pin;80 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
    MAX294EPA+  
    		Active PDIP(N);8 pin;80 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
    MAX294CWE    
    		Active SOIC(W);16 pin;112 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
    MAX294CWE-T    
    		Active

    Land Pattern: Not Available

    		0°C to +70°C See data sheet
    MAX294CWE+  
    		Active SOIC(W);16 pin;112 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
    MAX294CWE+T    
    		Active

    Land Pattern: Not Available

    		0°C to +70°C See data sheet
    MAX294EWE    
    		Active SOIC(W);16 pin;112 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
    MAX294EWE-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX294EWE+  
    		Active SOIC(W);16 pin;112 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
    MAX294EWE+T    
    		Active SOIC(W);16 pin;112 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
    MAX294CSA    
    		Active SOIC(N);8 pin;31 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0096 (PDF)
    Use pkgcode/variation: S8-5*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX294CSA-T    
    		Active

    Land Pattern: Not Available

    		0°C to +70°C See data sheet
    MAX294CSA+  
    		Active SOIC(N);8 pin;31 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0096 (PDF)
    Use pkgcode/variation: S8+5*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX294CSA+T    
    		Active

    Land Pattern: Not Available

    		0°C to +70°C See data sheet
    MAX294ESA    
    		Active SOIC(N);8 pin;31 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
    MAX294ESA-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX294ESA+  
    		Active SOIC(N);8 pin;31 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
    MAX294ESA+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX297 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX297MJA    
    		Active CDIP(N);8 pin;83 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
    MAX297C/D    
    		Active DICE SALES;NA pin;0 mm²

    Land Pattern: Not Applicable
    Use pkgcode/variation: DICE*
    		See data sheet
    MAX297CPA    
    		Active PDIP(N);8 pin;80 mm²
    Outline Drawing: 21-0043 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: P8-2*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX297CPA+  
    		Active PDIP(N);8 pin;80 mm²
    Outline Drawing: 21-0043 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: P8+2*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX297EPA    
    		Active PDIP(N);8 pin;80 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;80 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
    MAX297CWE    
    		Active SOIC(W);16 pin;112 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-T    
    		Active

    Land Pattern: Not Available

    		0°C to +70°C See data sheet
    MAX297CWE+  
    		Active SOIC(W);16 pin;112 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;112 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
    MAX297EWE    
    		Active SOIC(W);16 pin;112 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-T    
    		Active SOIC(W);16 pin;112 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;112 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;112 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
    MAX297CSA    
    		Active SOIC(N);8 pin;31 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0096 (PDF)
    Use pkgcode/variation: S8-5*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX297CSA-T    
    		Active

    Land Pattern: Not Available

    		0°C to +70°C See data sheet
    MAX297CSA+  
    		Active SOIC(N);8 pin;31 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0096 (PDF)
    Use pkgcode/variation: S8+5*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX297CSA+T    
    		Active

    Land Pattern: Not Available

    		0°C to +70°C See data sheet
    MAX297ESA    
    		Active SOIC(N);8 pin;31 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-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX297ESA+  
    		Active SOIC(N);8 pin;31 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

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet

    Notes and Comments
    • Single 8th-order, elliptic, switched-capacitor filter

    Related Products
    MAX7408, MAX7411, MAX7412, MAX7415 5th Order, Lowpass, Elliptic, Switched-Capacitor Filters
    MAX7400, MAX7403, MAX7404, MAX7407 8th-Order, Lowpass, Elliptic, Switched-Capacitor Filters

    More Like This: View Product Families for Similar Products

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     Description 
     Key Features 
     Applications/Uses 
     Key Specifications 
     Diagram 

    		 Data Sheet 
     Application Notes 
     Design Guides 
     Engineering Journals 
     Reliability Reports 
     Software/Models 
     Evaluation Kits 

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    Document Ref.: 19-0020; Rev 2; 2008-08-07
    This page last modified: 2009-11-06


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