MAX7491 - 双路、通用开关电容滤波器

MAX7491是Maxim美信半导体公司的一款滤波器(连续模式和开关电容)产品，MAX7491是双路、通用开关电容滤波器，本站介绍了MAX7491的封装应用图解、特点和优点、功能等，并给出了与MAX7491相关的Maxim元器件型号供参考。

MAX7491 - 双路、通用开关电容滤波器 - 滤波器(连续模式和开关电容) - Maxim美信半导体高性能芯片品质 - 美信半导体

产品概述

The MAX7490/MAX7491 consist of two identical low-power,low-voltage, wide dynamic range, rail-to-rail,2nd-order switched-capacitor building blocks. Each ofthe two filter sections, together with two to four externalresistors, can generate all standard 2nd-order functions:bandpass, lowpass, highpass, and notch (bandreject). Three of these functions are simultaneouslyavailable. Fourth-order filters can be obtained by cascadingthe two 2nd-order filter sections. Similarly, higherorder filters can easily be created by cascadingmultiple MAX7490/MAX7491s.

Two clocking options are available: self-clocking(through the use of an external capacitor) or externalclocking for tighter cutoff frequency control. The clock-to-center frequency ratio is 100:1. Sampling is done attwice the clock frequency, further separating the cutofffrequency and Nyquist frequency.

The MAX7490/MAX7491 have an internal rail splitterthat establishes a precise common voltage needed forsingle-supply operation. The MAX7490 operates from asingle +5V supply and the MAX7491 operates from asingle +3V supply. Both devices feature a low-powershutdown mode and come in a 16-pin QSOP package.

关键特性

以下关键特性由Maxim美信半导体提供：

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

热门应用

自适应滤波器

ADC抗混叠

多极点滤波器

锁相环(PLL)

DAC后置滤波

机顶盒

可调节的有源滤波器

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