MAX7428EKA+T

Product Overview

• Category: Integrated Circuit (IC)
• Use: Audio Filter
• Characteristics: Low-pass filter, 8th order elliptic, low distortion, high stopband attenuation
• Package: SOT23-8
• Essence: Provides precise filtering of audio signals
• Packaging/Quantity: Tape and Reel, 3000 units per reel

Specifications

• Supply Voltage Range: 2.7V to 5.5V
• Operating Temperature Range: -40°C to +85°C
• Passband Frequency Range: DC to 20kHz
• Stopband Attenuation: >60dB at 100kHz
• Total Harmonic Distortion: <0.01% at 1kHz
• Input Impedance: 10kΩ
• Output Impedance: 50Ω

Pin Configuration

The MAX7428EKA+T has a total of 8 pins arranged as follows:

```

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| | --| VDD OUT |-- Pin 1: Output --| GND IN+ |-- Pin 2: Non-Inverting Input --| GND IN- |-- Pin 3: Inverting Input --| GND BP |-- Pin 4: Band-Pass Output --| GND LP |-- Pin 5: Low-Pass Output --| GND NC |-- Pin 6: No Connection --| GND VDD |-- Pin 7: Positive Power Supply |___________| ```

Functional Features

• 8th order elliptic low-pass filter
• Precise filtering of audio signals
• Low distortion for high-quality audio output
• High stopband attenuation for effective noise reduction
• Wide supply voltage range for versatile applications
• Compact SOT23-8 package for space-constrained designs

Advantages and Disadvantages

Advantages

• Provides precise audio signal filtering
• Low distortion ensures high-quality sound output
• High stopband attenuation effectively reduces noise
• Wide supply voltage range allows for flexible usage
• Compact package size saves board space

Disadvantages

• Limited to audio signal filtering applications
• Requires external components for complete circuit implementation
• Not suitable for high-frequency applications

Working Principles

The MAX7428EKA+T is an 8th order elliptic low-pass filter integrated circuit. It utilizes a combination of active and passive components to achieve precise filtering of audio signals. The input audio signal is fed into the non-inverting and inverting inputs, and the filtered output is obtained from the low-pass and band-pass outputs.

The IC's internal circuitry consists of multiple stages of active filters and passive components, which work together to attenuate frequencies above the passband range. This results in a clean and filtered audio output with minimal distortion and reduced noise.

Detailed Application Field Plans

The MAX7428EKA+T is commonly used in various audio applications that require precise signal filtering. Some potential application fields include:

1. Audio Amplifiers: Used as a pre-filter to remove unwanted noise and interference before amplification.
2. Audio Recording Equipment: Ensures accurate reproduction of recorded audio by eliminating unwanted frequencies.
3. Home Theater Systems: Enhances audio quality by removing high-frequency noise and distortion.
4. Car Audio Systems: Improves sound clarity and fidelity by filtering out unwanted frequencies.
5. Musical Instruments: Used in electronic musical instruments to shape and refine the audio output.

Detailed and Complete Alternative Models

1. MAX7427EKA+T: Similar to MAX7428EKA+T but with a different passband frequency range.
2. MAX7429EKA+T: Higher-order elliptic low-pass filter with improved stopband attenuation.
3. MAX7456EKA+T: Programmable audio filter IC with adjustable passband and stopband characteristics.

These alternative models offer similar functionality and can be considered based on specific application requirements.

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