The MAX260/MAX261/MAX262AMRG/HR CMOS dual second-order universal switched-capacitor active filters allow microprocessor control of precise filter functions. No external components are required for a variety of bandpass, lowpass, highpass, notch, and allpass configurations. Each device contains two second-order filter sections that place center frequency, Q, and filter operating mode under programmed control. An input clock, along with a 6-bit f0 program input, determine the filter’s center or corner frequency without affecting other filter parameters. The filter Q is also programmed independently. Separate clock inputs for each filter section operate with either a crystal, RC network, or external clock generator. The MAX260 has offset and DC specifications superior to the MAX261 and MAX262AMRG/HR and a center frequency (f0) range of 7.5kHz. The MAX261 handles center frequencies to 57kHz, while the MAX262AMRG/HR extends the center frequency range to 140kHz by employing lower clock-to-f0 ratios. All devices are available in 24-pin DIP and small outline packages in commercial, extended, and military temperature ranges.
characterization
- Filter Design Software Available
- Microprocessor Interface
- 64-Step Center Frequency Control
- 128-Step Q Control
- Independent Q and f0 Programming
- Guaranteed Clock to f0 Ratio-1% (A grade)
- 75kHz f0 Range (MAX262)
- Single +5V and ±5V Operation
Application Areas
- μP-Tuned Filters
- Adaptive Filters
- Anti-Aliasing Filters
- Digital Signal Processing (DSP)
- Phase-Locked Loops (PLLs)
- Signal Analysis
(Product Image: Diagram)
Technical Parameters
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Number of Channels
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2
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Cutoff Frequency
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140 kHz
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Supply Voltage Max
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12.6 V
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Supply Voltage Min
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4.74 V
MAX262AMRG/HR Datasheet
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MAX262 data sheet for guidance
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