MAX7403ESA+

Overview

The MAX7403ESA+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 normal mode and reduces to 0.2µA in shutdown mode. The device includes an offset adjustment pin (OS) for DC level shifting and operates within a temperature range of -40°C to +85°C.

Feature Summary

• 8th-order lowpass elliptic filter response
• Clock-tunable corner frequency
• Low-power shutdown capability
• Offset adjustment functionality

Applications

• ADC anti-aliasing
• Post-DAC filtering
• Speech processing
• Air-bag electronics
• CT2 base stations

Procurement Notes

Verify the specific suffix 'ESA+T' against official documentation to confirm the package type, temperature grade, and tape-and-reel packaging configuration. Ensure compatibility with the required +5V single-supply operation and check for any lead-free or RoHS compliance requirements relevant to the manufacturing batch.

Selection Notes

Select this component when an 8th-order elliptic response with a 1.2 transition ratio is required. It is suitable for applications needing a maximum corner frequency of 10kHz on a +5V supply. Consider alternatives like the MAX7400 if higher stopband rejection is needed, or the MAX7404/MAX7407 if a +3V supply is preferred.

Part Context

This part belongs to the MAX7400 family of switched-capacitor filters, which also includes the MAX7400, MAX7404, and MAX7407. These devices share similar architectural features but differ in operating voltage and filter response characteristics. The MAX7403 specifically provides a sharper rolloff compared to the MAX7400 while maintaining +5V operation.

Replacement Considerations

Direct substitutes include other members of the MAX7400 family such as the MAX7400, MAX7404, and MAX7407, depending on voltage and rolloff requirements. Verify pinout compatibility and electrical specifications before substitution.

FAQ

How is the corner frequency determined?

The corner frequency is determined by the clock frequency applied to the CLK pin, following a 100:1 clock-to-corner frequency ratio.

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 for DC level shifting.

How does the shutdown mode affect the device?

Driving the SHDN pin low activates shutdown mode, reducing supply current to 0.2µA and placing the output in a high-impedance state.