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Maxim > Products > Filters (Analog) 
MAX7490, MAX7491
Dual Universal Switched-Capacitor Filters


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Data Sheet
FULL DATA SHEET (PDF, 232kB)
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Description
The MAX7490/MAX7491 consist of two identical low-power, low-voltage, wide dynamic range, Rail-to-Rail, 2nd-order switched-capacitor building blocks. Each of the two filter sections, together with two to four external resistors, can generate all standard 2nd-order functions: bandpass, lowpass, highpass, and notch (band reject). Three of these functions are simultaneously available. Fourth-order filters can be obtained by cascading the two 2nd-order filter sections. Similarly, higher order filters can easily be created by cascading multiple MAX7490/MAX7491s.

Two clocking options are available: self-clocking (through the use of an external capacitor) or external clocking for tighter cutoff frequency control. The clock-to-center frequency ratio is 100:1. Sampling is done at twice the clock frequency, further separating the cutoff frequency and Nyquist frequency.

The MAX7490/MAX7491 have an internal rail splitter that establishes a precise common voltage needed for single-supply operation. The MAX7490 operates from a single +5V supply and the MAX7491 operates from a single +3V supply. Both devices feature a low-power shutdown mode and come in a 16-pin QSOP package.

Key Features   Applications/Uses
  • Dual 2nd-Order Filter in a 16-Pin QSOP Package
  • High Accuracy
    • Q Accuracy: ±0.2&%
    • Clock-to-Center Frequency Error: ±0.2%
  • Rail-to-Rail Input and Output Operation
  • Single-Supply Operation: +5V (MAX7490) or +3V (MAX7491)
  • Internal or External Clock
  • Highpass, Lowpass, Bandpass, and Notch Filters
  • Clock-to-Center Frequency Ratio of 100:1
  • Internal Sampling-to-Center Frequency Ratio of 200:1
  • Center Frequency up to 40kHz
  • Easily Cascaded for Multipole Filters
  • Low-Power Shutdown: <1µA Supply Current

 
  		• Adaptive Filters
  		• ADC Anti-Aliasing
  		• Multipole Filters
  		• Phase-Locked Loops (PLLs)
  		• Post-DAC Filtering
  		• Set-Top Boxes
  		• Tunable Active Filters

    Key Specifications:   Active Filters
    Part Number Filter Sections per Pkg. Order per Filter Section Filter Class Filter Type Filter Characteristic Program Method Lowest Cutoff (Hz) Highest Cutoff (kHz) Supply Voltage (V) Package RoHS Available Operating Temp. Range (°C) Price**
    MAX7490  2 2 Switched Cap Universal Programmable Clock 1 40 5 QSOP/16 Yes -40 to +85
    0 to +70     		$2.15 @ 1k
    MAX7491  3 $2.15 @ 1k
    See All Active Filters (45)
    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
    MAX7490, MAX7491: Typical Operating Circuit
    Typical Operating Circuit

    Application Notes
  		• Application Note 733: A Filter Primer - MAX7490, MAX7491
  		• Application Note 928: Filter Basics: Anti-Aliasing - MAX7490, MAX7491
  		• Application Note 3494: The Basics of Anti-Aliasing: Using Switched-Capacitor Filters - MAX7490

    Evaluation Kits
    none

    Design Guides
  		• FILTERS (PDF)

    Reliability Reports
  		• 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: 1-16 of 16

    MAX7490 Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX7490CEE  
    		QSOP;16 pin;
    Dwg: 21-0055H (PDF)
    Use pkgcode/variation: E16-4*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX7490CEE+T  
    		QSOP;16 pin;
    Dwg: 21-0055H (PDF)
    Use pkgcode/variation: E16+4*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX7490CEE+  
    		QSOP;16 pin;
    Dwg: 21-0055H (PDF)
    Use pkgcode/variation: E16+4*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX7490CEE-T  



    		0°C to +70°C See data sheet
    MAX7490EEE+T  
    		QSOP;16 pin;
    Dwg: 21-0055H (PDF)
    Use pkgcode/variation: E16+4*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX7490EEE+  
    		QSOP;16 pin;
    Dwg: 21-0055H (PDF)
    Use pkgcode/variation: E16+4*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX7490EEE-T  
    		QSOP;16 pin;
    Dwg: 21-0055H (PDF)
    Use pkgcode/variation: E16-4*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX7490EEE  
    		QSOP;16 pin;
    Dwg: 21-0055H (PDF)
    Use pkgcode/variation: E16-4*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX7491 Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX7491CEE-T  
    		QSOP;16 pin;
    Dwg: 21-0055H (PDF)
    Use pkgcode/variation: E16-4*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX7491CEE  
    		QSOP;16 pin;
    Dwg: 21-0055H (PDF)
    Use pkgcode/variation: E16-4*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX7491CEE+  
    		QSOP;16 pin;
    Dwg: 21-0055H (PDF)
    Use pkgcode/variation: E16+4*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX7491CEE+T  



    		0°C to +70°C See data sheet
    MAX7491EEE-T  
    		QSOP;16 pin;
    Dwg: 21-0055H (PDF)
    Use pkgcode/variation: E16-4*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX7491EEE  
    		QSOP;16 pin;
    Dwg: 21-0055H (PDF)
    Use pkgcode/variation: E16-4*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX7491EEE+  
    		QSOP;16 pin;
    Dwg: 21-0055H (PDF)
    Use pkgcode/variation: E16+4*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX7491EEE+T  
    		QSOP;16 pin;
    Dwg: 21-0055H (PDF)
    Use pkgcode/variation: E16+4*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis

    More Information
  		• New Product Press Release 2000-07-20 

    Related Products
    MAX7408, MAX7411, MAX7412, MAX7415 5th Order, Lowpass, Elliptic, Switched-Capacitor Filters
    MAX7409, MAX7410, MAX7413, MAX7414 5th-Order, Lowpass, Switched-Capacitor Filters

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    Document Ref.: 19-1768; Rev 0; 2000-07-01
    This page last modified: 2007-07-23




             


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