MAX296ESA+T

Overview

The MAX296ESA+T is an 8th-order, lowpass, switched-capacitor filter manufactured by Analog Devices Inc./Maxim Integrated. It features a Bessel response designed for low overshoot and fast settling times. The device operates with a clock-to-corner-frequency ratio of 50:1, supporting a corner frequency range from 0.1Hz to 50kHz. It requires no external resistors or capacitors for the filter core and can be powered by a single +5V supply or dual ±5V supplies. The component includes an uncommitted operational amplifier for anti-aliasing or clock-noise filtering. It is housed in an 8-pin SO package and supports an operating temperature range of -40°C to +85°C.

Feature Summary

• Bessel filter response providing linear phase characteristics and minimal signal distortion
• Clock-tunable corner frequency adjustable via internal oscillator or external clock source
• Integrated uncommitted operational amplifier for additional continuous-time filtering stages

Applications

• ADC Anti-Aliasing Filter
• Noise Analysis
• DAC Post-Filtering
• 50Hz/60Hz Line-Noise Filtering

Procurement Notes

Verify the specific ordering suffix against official manufacturer documentation to confirm package type and temperature rating. Ensure that any additional characters following the base model number correspond exactly to the intended RoHS compliance status and packaging format. Cross-reference the part identifier with authorized distributor catalogs to validate current availability and manufacturing lifecycle status before finalizing procurement plans.

Selection Notes

Select this component when a maximally flat passband is not required, but rather a linear phase response and rapid settling time are critical for preserving pulse shapes. The MAX296 is suitable for applications involving multiplexed signals where channel switching occurs frequently. Verify that the system clock frequency allows for the desired corner frequency within the specified 50:1 ratio constraints.

Part Context

This component belongs to the MAX291/MAX292/MAX295/MAX296 family of 8th-order lowpass switched-capacitor filters. While the MAX291 and MAX295 utilize Butterworth responses, the MAX292 and MAX296 variants specifically implement Bessel characteristics. This family shares identical pinouts and basic operational principles, differing primarily in their frequency response profiles and maximum corner frequency capabilities.

Replacement Considerations

MAX296ESA

FAQ

What is the primary advantage of the MAX296 over the MAX295?

The MAX296 provides a Bessel filter response, which ensures low overshoot and fast settling times due to linear phase characteristics in the passband. In contrast, the MAX295 offers a Butterworth response with a maximally flat magnitude.

How is the corner frequency determined for the MAX296?

The corner frequency is controlled by the clock frequency applied to the CLK pin. The MAX296 operates with a fixed clock-to-corner-frequency ratio of 50:1, allowing the cutoff point to be adjusted dynamically by varying the input clock rate.

Can the MAX296 operate with a single power supply?

Yes, the device can operate with a single +5V supply or dual ±5V supplies. When using a single supply, the GND pin must be biased to the mid-supply voltage level to accommodate the signal swing.