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5th Order, Lowpass, Elliptic, Switched-Capacitor Filters

Smallest, Low-Power 5th-Order Filters

Product Details

Key Features

Applications/Uses

Parametric specs for Active Filters
Filter Type Lowpass
Filter Sections 1
Order Per Filter Section 5
Highest Cutoff (kHz) (min) 15
Lowest Cutoff (Hz) (max) 1
Filter Class Switched Cap
Filter Characteristic Elliptic
Program Method Clock
Oper. Temp. (°C) -40 to +85
0 to +70
Package/Pins UMAX/8
Budgetary
Price (See Notes)
2.24
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Simplified Block Diagram

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Parameters

Parametric specs for Active Filters
Filter Type Lowpass
Filter Sections 1
Order Per Filter Section 5
Highest Cutoff (kHz) (min) 15
Lowest Cutoff (Hz) (max) 1
Filter Class Switched Cap
Filter Characteristic Elliptic
Program Method Clock
Oper. Temp. (°C) -40 to +85
0 to +70
Package/Pins UMAX/8
Budgetary
Price (See Notes)
2.24

Key Features

  • 5th-Order, Elliptic Lowpass Filters
  • Low Noise and Distortion: -80dB THD + Noise
  • Clock-Tunable Corner Frequency (1Hz to 15kHz)
  • Single-Supply Operation
    • +5V (MAX7408/MAX7411)
    • +3V (MAX7412/MAX7415)
  • Low Power
    • 1.2mA (operating mode)
    • 0.2µA (shutdown mode)
  • Available in 8-Pin µMAX®/DIP Packages
  • Low Output Offset: ±4mV

Applications/Uses

  • ADC Anti-Aliasing
  • CT2 Base Stations
  • Post-DAC Filtering
  • Speech Processing

Description

The MAX7408/MAX7411/MAX7412/MAX7415 5th-order, lowpass, elliptic, switched-capacitor filters (SCFs) operate from a single +5V (MAX7408/MAX7411) or +3V (MAX7412/MAX7415) supply. The devices draw only 1.2mA of supply current and allow corner frequencies from 1Hz to 15kHz, making them ideal for low-power post-DAC filtering and anti-aliasing applications. They can be put into a low-power mode, reducing 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. An offset-adjust pin allows for adjustment of the DC output level.

The MAX7408/MAX7412 deliver 53dB of stopband rejection and a sharp rolloff with a transition ratio of 1.6. The MAX7411/MAX7415 achieve a sharper rolloff with a transition ratio of 1.25 while still providing 37dB of stop-band rejection. Their fixed response limits the design task to selecting a clock frequency.

Simplified Block Diagram

MAX7408, MAX7411, MAX7412, MAX7415: Typical Operating Circuit MAX7408, MAX7411, MAX7412, MAX7415: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .