MAX7403CSA+T

Overview

The MAX7403CSA+T is an 8th-order, lowpass, elliptic switched-capacitor filter operating from a single +5V supply. It features a sharp rolloff with a transition ratio of 1.2 and typical stopband rejection of 60dB. The corner frequency is clock-tunable from 1Hz to 10kHz using a 100:1 clock-to-corner ratio. Supply current is 2mA in operating mode and reduces to 0.2µA in shutdown mode. The device includes an offset adjustment pin (OS) for DC output level control and supports both self-clocking via an external capacitor and external clocking.

Feature Summary

• 8th-Order Lowpass Elliptic Filter
• Clock-Tunable Corner Frequency (1Hz to 10kHz)
• Low Power with Shutdown Mode
• Single-Supply Operation (+5V)

Applications

• ADC Anti-Aliasing
• Speech Processing
• Post-DAC Filtering
• Air-Bag Electronics
• CT2 Base Stations

Procurement Notes

Verify the component matches the exact part number MAX7403CSA+T. Confirm the manufacturer is Analog Devices Inc./Maxim Integrated. Check the package type is 8-pin SO. Ensure the temperature range is 0°C to +70°C. Validate the datasheet revision and date against official sources.

Selection Notes

Select this component when an 8th-order elliptic filter response with a 1.2 transition ratio is required. It is suitable for applications needing a sharp rolloff and 60dB stopband rejection. Use it for single-supply +5V systems requiring low power consumption and clock-tunable corner frequencies between 1Hz and 10kHz.

Part Context

The MAX7403 is part of the MAX7400/MAX7403/MAX7404/MAX7407 family of 8th-order, lowpass, elliptic, switched-capacitor filters. These devices are designed for low-power anti-aliasing and post-DAC filtering applications. They offer flexible clocking options and a shutdown mode for power savings.

Replacement Considerations

MAX7400CSA+T provides similar functionality but with a 1.5 transition ratio and 82dB stopband rejection. MAX7404CSA+T operates on a +3V supply instead of +5V. MAX7407CSA+T also operates on a +3V supply. Verify supply voltage requirements and specific filter response characteristics before substitution.

FAQ

What is the difference between MAX7403 and MAX7400?

The MAX7403 has a transition ratio of 1.2 and 60dB stopband rejection, while the MAX7400 has a transition ratio of 1.5 and 82dB stopband rejection.

How is the corner frequency determined?

The corner frequency is determined by the clock frequency divided by 100. It can be set using an external clock or an internal oscillator controlled by an external capacitor on the CLK pin.

What is the purpose of the OS pin?

The OS pin allows for the adjustment of the DC output level. It can be connected to COM for no offset adjustment or biased externally to shift the output DC level.