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General Description

The MAX7490/MAX7491 consist of two identical low power, low-voltage, wide dynamic range, rail-to-rail, 2nd-order switched-capacitor building blocks. Each of the two filter sections, together with two to four external resistors, can generate all standard 2nd-order functions: bandpass, lowpass, highpass, and notch (band reject). Three of these functions are simultaneously available. Fourth-order filters can be obtained by cascading the two 2nd-order filter sections. Similarly, higher order filters can easily be created by cascading multiple MAX7490/MAX7491s.

Features

? 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:

Applications

??? Tunable Active Filters

??? Multipole Filters

??? ADC Anti-Aliasing

??? Post-DAC Filtering

??? Adaptive Filtering

??? Phase-Locked Loops (PLLs)

??? Set-Top Boxes