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八阶、低通、开关电容滤波器

请参考MAX7401/MAX7405 8阶、低功耗贝塞尔滤波器

产品详情

The MAX291/MAX292/MAX295/MAX296 are easy-to-use, 8th-order, lowpass, switched-capacitor filters that can be set up with corner frequencies from 0.1Hz to 25kHz (MAX291/MAX292) or 0.1Hz to 50kHz (MAX295/MAX296).

The MAX291/MAX295 Butterworth filters provide maximally flat passband response, and the MAX292/MAX296 Bessel filters provide low overshoot and fast settling. All four 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 operational amplifier (noninverting input grounded) is provided for building a continuous time lowpass filter for post-filtering or anti-aliasing.

Produced in an 8-pin DIP/SO and a 16-pin wide SO package, and requiring a minimum of external components, the MAX291 series delivers very aggressive performance from a tiny area.

主要特征

  • 8th-Order Lowpass Filters:
    • Butterworth (MAX291/MAX295)
    • Bessel (MAX292/MAX296)
  • Clock-Tunable Corner-Frequency Range:
    • 0.1Hz to 25kHz (MAX291/MAX292)
    • 0.1Hz to 50kHz (MAX295/MAX296)
  • No External Resistors or Capacitors Required
  • Internal or External Clock
  • Clock to Corner Frequency Ratio:
    • 100:1 (MAX291/MAX292)
    • 50:1 (MAX295/MAX296)
  • Low Noise: -70dB THD + Noise (Typ)
  • Operate with a Single +5V Supply or Dual ±5V Supplies
  • Uncommitted Op Amp for Anti-Aliasing or Clock-Noise Filtering
  • 8-Pin DIP and SO Packages

应用/用途

  • 50Hz/60Hz电源噪声滤波
  • ADC抗混叠滤波器
  • DAC后置滤波
  • 噪声分析
Parametric specs for Active Filters
Filter Type Lowpass
Filter Sections 1
Order Per Filter Section 8
Highest Cutoff (kHz) (min) 25
Lowest Cutoff (Hz) (max) 0.1
Filter Class Switched Cap
Filter Characteristic Bessel
Program Method Clock
Oper. Temp. (°C) -55 to +125
-40 to +85
0 to +70
Package/Pins PDIP/8
SOIC (N)/8
SOIC (W)/16
Budgetary
Price (See Notes)
$4.41 @1k
查看更多

简化框图

MAX291、MAX292、MAX295、MAX296:典型工作电路 MAX291、MAX292、MAX295、MAX296:典型工作电路 Zoom icon

技术文档

设计与质量

单击下面的标题以查看详情页面

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参量

Parametric specs for Active Filters
Filter Type Lowpass
Filter Sections 1
Order Per Filter Section 8
Highest Cutoff (kHz) (min) 25
Lowest Cutoff (Hz) (max) 0.1
Filter Class Switched Cap
Filter Characteristic Bessel
Program Method Clock
Oper. Temp. (°C) -55 to +125
-40 to +85
0 to +70
Package/Pins PDIP/8
SOIC (N)/8
SOIC (W)/16
Budgetary
Price (See Notes)
$4.41 @1k

主要特征

  • 8th-Order Lowpass Filters:
    • Butterworth (MAX291/MAX295)
    • Bessel (MAX292/MAX296)
  • Clock-Tunable Corner-Frequency Range:
    • 0.1Hz to 25kHz (MAX291/MAX292)
    • 0.1Hz to 50kHz (MAX295/MAX296)
  • No External Resistors or Capacitors Required
  • Internal or External Clock
  • Clock to Corner Frequency Ratio:
    • 100:1 (MAX291/MAX292)
    • 50:1 (MAX295/MAX296)
  • Low Noise: -70dB THD + Noise (Typ)
  • Operate with a Single +5V Supply or Dual ±5V Supplies
  • Uncommitted Op Amp for Anti-Aliasing or Clock-Noise Filtering
  • 8-Pin DIP and SO Packages

应用/用途

  • 50Hz/60Hz电源噪声滤波
  • ADC抗混叠滤波器
  • DAC后置滤波
  • 噪声分析

描述

The MAX291/MAX292/MAX295/MAX296 are easy-to-use, 8th-order, lowpass, switched-capacitor filters that can be set up with corner frequencies from 0.1Hz to 25kHz (MAX291/MAX292) or 0.1Hz to 50kHz (MAX295/MAX296).

The MAX291/MAX295 Butterworth filters provide maximally flat passband response, and the MAX292/MAX296 Bessel filters provide low overshoot and fast settling. All four 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 operational amplifier (noninverting input grounded) is provided for building a continuous time lowpass filter for post-filtering or anti-aliasing.

Produced in an 8-pin DIP/SO and a 16-pin wide SO package, and requiring a minimum of external components, the MAX291 series delivers very aggressive performance from a tiny area.

简化框图

MAX291、MAX292、MAX295、MAX296:典型工作电路 MAX291、MAX292、MAX295、MAX296:典型工作电路 Zoom icon

技术文档

支持和培训

在Maxim的知识库中搜索您所需的答案。

过滤搜索

Maxim专业的应用工程师团队也可以为您解答技术问题,请 访问Maxim的 支持中心