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MAX275：4th- and 8th-Order, Continuous-Time Active Filters

Low-Noise Continuous-Time Filters Eliminate Clock Noise and Aliasing

The MAX274 and MAX275 are continuous-time active filters consisting of independent cascadable 2nd-order sections. Each section can implement any all-pole bandpass or lowpass filter response, such as Butterworth, Bessel, Chebyshev, and is programmed by four external resistors. The MAX274/MAX275 provide lower noise that switched-capacitor filters, as well as superior dynamic performance—both due to the continuous-time design. Since continuous-time filters do not require a clock, aliased and clock noise are eliminated with the MAX274/MAX275. The MAX274 comprises of four 2nd-order sections, permitting 8th-order filters to be realized. Center frequencies range up to 150kHZ, and are accurate to within ±1% over the full operating temperature range. Total harmonic distortion (THD) is typically better than -86dB. The MAX275 comprises of two 2nd-order sections, permitting 4th-order filters to be realized. Center frequencies range up to 300kHZ, and are accurate to within ±0.9% over the full operating temperature range. Total harmonic distortion (THD) is typically better than -86dB. Both filters operate from a single +5V supply or from dual ±5V supplies.

Key Features Continuous-TIme Filter - No Clock, No Clock Noise Implement Butterworth, Chebyshev, Bessel and Other Filter Responses Lowpass, Bandpass Outputs Operate from a Single +5V Supply or Dual ±5V Supplies Design Software Available MAX274 Evaluation Kit Available 8th-Order-Four 2nd-Order Sections (MAX274) 4th-Order-Two 2nd-Order Sections (MAX275) Center-Frequency Range: 150kHz for MAX274 300kHz for MAX275 Low Noise: -86dB THD Typical for MAX274 -89dB THD Typical for MAX275 Center-Frequency Accurate Over Temp: within ±1% for MAX274 within ±0.9% for MAX275

MAX274, MAX274EVKIT, MAX275: Typical Operating Circuit Applications/Uses Audio/Sonar/Avionics Frequency Filtering DAC Output-Smoothing Filters Low-Distortion Anti-Aliasing Filters Modems Vibration Analysis

DataSheet

Parametrics

Design kits & evaluation modules

• MAX274
• MAX274EVKIT
• MAX275

Quality and Environmental Data

• MAX275.pdf

Ordering Information