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五阶、低通、椭圆函数、开关电容滤波器

尺寸最小的低功耗5阶滤波器

产品详情

主要特征

应用/用途

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 PDIP/8
UMAX/8
Budgetary
Price (See Notes)
2.5
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参量

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 PDIP/8
UMAX/8
Budgetary
Price (See Notes)
2.5

主要特征

  • 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

应用/用途

  • ADC抗混叠
  • CT2基站
  • DAC后置滤波
  • 语音处理

描述

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.

简化框图

MAX7408、MAX7411、MAX7412、MAX7415:典型工作电路 MAX7408、MAX7411、MAX7412、MAX7415:典型工作电路 Zoom icon

技术文档

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