八阶、低通、椭圆函数、开关电容滤波器

 

器件号	Replacement	Explanation

说明

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The MAX7400/MAX7403/MAX7404/MAX7407 8th-order, lowpass, elliptic, switched-capacitor filters (SCFs) operate from a single +5V (MAX7400/MAX7403) or +3V (MAX7404/MAX7407) supply. These devices draw 2mA of supply current and allow corner frequencies from 1Hz to 10kHz, making them ideal for low-power anti-aliasing and post-DAC filtering applications. They feature a shutdown mode that reduces the 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. In addition, an offset adjustment pin (OS) allows for the adjustment of the DC output level.

The MAX7400/MAX7404 provide 82dB of stopband rejection and a sharp rolloff with a transition ratio of 1.5. The MAX7403/MAX7407 provide a sharper rolloff with a transition ratio of 1.2, while still delivering 60dB of stopband rejection. The fixed response of these devices simplifies the design task to corner-frequency selection by setting a clock frequency. The MAX7400/MAX7403/MAX7404/MAX7407 are available in 8-pin SO and DIP packages.

MAX7400、MAX7403、MAX7404、MAX7407：典型工作电路 放大+

关键特性

• 8th-Order Lowpass Elliptic Filter
• Low Noise and Distortion -82dB THD + Noise (MAX7400)
• Clock-Tunable Corner Frequency (1Hz to 10kHz)
• 100:1 Clock-to-Corner Ratio
• Single-Supply Operation
  • +5V (MAX7400/MAX7403)
  • +3V (MAX7404/MAX7407)
• Low Power
  • 2mA (Operating Mode)
  • 0.2µA (Shutdown Mode)
• Available in 8-Pin SO and DIP Packages
• Low Output Offset: ±5mV

应用

• ADC抗混叠
• 气囊电子装置
• CT2基站
• DAC后置滤波
• 语音处理