MAX7491CEE+

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The MAX7491/MAX7491CEE+ is a filter part of the interface family, and it is an active filter. It is an ultra-small, low-power, single-channel filter, operating at 3.2V and -40°C to +85°C. It offers features such as a wide input voltage range from 2V to 14V, an operating temperature range from -40°C to +85°C, and a small total solution size of 2mm by 3mm. Furthermore, the low-power operation allows a single MAX7491 to be powered with a single Li-ion coin cell.

The MAX7491/MAX7491CEE+ is comprised of an all-digital filter, filter clock, and filter loop, all of which are integrated into a single chip. The all-digital filter operates at up to 24MHz and provides a -3 dB cutoff frequency of 1.6MHz. The center frequency of this band-pass filter is selected by an on-chip register accessible through an I²C compatible serial bus. Additionally, the filter clock can run at any rate from 1MHz to 24MHz, allowing for application-specific tuning of the filter clock. Finally, the filter loop is designed to minimize aliasing and phase jitter, ensuring the best possible performance from the MAX7491/MAX7491CEE+.

The all-digital filter of the MAX7491 is designed to represent the signal as accurately as possible. The signal is fed into a clock divider, where it is modulated at the clock frequency. The modulated signal is then filtered through a selector, where the signal is separated into low-frequency and higher-frequency components. The signal is then reconstructed using a digital-to-analog converter (DAC), which allows the MAX7491 to accurately represent the signal without distortion or signal degradation.

The MAX7491CEE+ also incorporates an adjustable gain block that allows for gain setting adjustments between 0 dB and 20 dB, and an additional anti-alias filter that provides high-quality filtering of signals before they enter the MAX7491. Additionally, the MAX7491CEE+ includes a form-factor test and calibration circuit that allows for accurate calibration and testing of the device, which can result in fewer post-production tuning cycles.

The MAX7491/MAX7491CEE+ is an ideal solution for applications where higher signal-to-noise ratio and reduced distortion are required. It is particularly useful for audio applications such as portable audio players, cellular phones, and laptop and desktop computer systems. Additionally, it is also useful for automotive and medical applications due to its small size and low-power requirements, as well as its wide temperature range.

In summary, the MAX7491/MAX7491CEE+ is an ideal solution for applications that require high signal-to-noise ratio and reduced distortion. It is particularly well suited for audio, automotive, and medical applications due to its small size, low-power requirements, and wide temperature range. The adjustable gain block and anti-alias filter incorporated into the MAX7491CEE+ allow for greater tunability and accuracy, resulting in fewer post-production tuning cycles.

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