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MAX7490 SSOP-1
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Dual Universal Switched-Capacitor Filters

Manufacturer :
Maxim Integrated
Package/Case :
Product Categories :
Active Filters
RoHs Status:
Lead free / RoHS Compliant

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MAX7490 Product Details

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.


  • 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

MAX7490 Block Diagram
(Picture: Diagram)

Technical Parameters

Filter Sections 2 Vsupply (V) 5
Order Per Filter Section 2 Features -
Filter Class Switched Cap Industry Qualified -
Filter Type Universal Oper. Temp. (\u00b0C) -40 to +85 ,0 to +70
Filter Characteristic Programmable Package/Pins QSOP/16
Program Method Clock Smallest Available Pckg. (max w/pins) (mm2) 30.9
Lowest Cutoff (max) (Hz) 1 RoHS Available Yes
Highest Cutoff (min) (kHz) 40 Budgetary Price (See Notes) $3.95 @1k
Vsupply (Dual) (Dual) (\u00b1V) -

MAX7490 Documents

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