The MAX7412EUA+T belongs to Maxim's MAX7408/MAX7411/MAX7412/MAX7415 family of 5th-order, lowpass, elliptic switched-capacitor filters (SCFs). The MAX7412 is the +3V member with a transition ratio of 1.6; it delivers a sharp elliptic rolloff from a single low-voltage supply, ideal for anti-aliasing and post-DAC filtering in portable and battery-powered systems.

The corner frequency is set simply by a clock: the internal oscillator runs at 100x the corner frequency, so an external capacitor on CLK (or an external clock) tunes the corner anywhere from 1Hz to 15kHz. No external precision resistors or capacitors are needed per pole-zero pair, which is the central advantage of the switched-capacitor approach - the design task becomes choosing a clock.

With -80dB THD+noise, low output offset, 1.2mA operating current and a 0.2µA shutdown mode, the MAX7412 suits ADC anti-aliasing, CT2 base stations, post-DAC filtering and speech processing. It is supplied in a space-saving 8-pin µMAX package.

Note: Refer to the official Maxim MAX7408-MAX7415 datasheet for full electrical parameters. Subject to change without notice; verify all parameters before final design.

The MAX7412EUA+T ships in an 8-pin µMAX package (EUA), a compact small-outline body suited to dense, low-voltage signal-chain boards. The "+" marks the RoHS-compliant lead-free finish and "T" the tape-and-reel packing.

Standard 8-lead µMAX land patterns and reflow profiles apply; bypass V_DD close to the device and place the COM bypass capacitor (0.1µF to GND) near pin 1. Keep the CLK trace short to limit clock feedthrough. The package outline is shown below.

The MAX7412 uses an 8-pin µMAX pinout (top view):

• Pin 1 - COM: Common input; biased internally at mid-supply, bypass to GND with 0.1µF. Drive externally to override the internal bias.
• Pin 2 - IN: Filter input.
• Pin 3 - GND: Ground.
• Pin 4 - VDD: Positive supply (+3V for MAX7412).
• Pin 5 - OUT: Filter output.
• Pin 6 - OS: Offset-adjust input; tie to COM if no offset trim is needed.
• Pin 7 - SHDN̅: Shutdown, active-low; drive high or to VDD for normal operation.
• Pin 8 - CLK: Clock input; an external capacitor (C_CLK) to GND sets the internal oscillator, or drive with an external clock (f_corner = f_CLK/100).

For self-clocking, connect C_CLK from CLK to GND; for external clocking, drive CLK directly. Confirm the exact pin assignment against the datasheet image below before layout.

The following parts are listed for reference. Verify supply voltage, filter response and package before substituting.

Maxim Integrated, now part of Analog Devices (NASDAQ: ADI), is a leading supplier of switched-capacitor filters and analog signal-chain ICs. The MAX7408-MAX7415 family provides clock-tunable elliptic lowpass filtering for anti-aliasing and reconstruction.

Maxim/ADI provides complete datasheets, application notes and long-term supply, with authorized distribution and technical support across China for both prototype and volume programs.