MAX981CSA+T

Product Overview

• Category: Integrated Circuit (IC)
• Use: Audio Amplifier
• Characteristics: Low Noise, High Gain, Small Package Size
• Package: 8-SOIC (Small Outline Integrated Circuit)
• Essence: Single-Supply Microphone Preamplifier
• Packaging/Quantity: Tape and Reel, 2500 pieces per reel

Specifications

• Supply Voltage Range: 2.7V to 5.5V
• Input-Referred Noise: 30nV/√Hz
• Gain: 20dB to 60dB
• Total Harmonic Distortion (THD): 0.01%
• Output Voltage Swing: 0.1V to VDD-1.2V
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The MAX981CSA+T has a total of 8 pins arranged as follows:

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| | --| VDD OUT|-- Pin 1 --| GND IN+|-- Pin 2 --| SHDN IN-|-- Pin 3 --| BIAS NC |-- Pin 4 --| BYP NC |-- Pin 5 --| NC NC |-- Pin 6 --| NC NC |-- Pin 7 --| GND VREF|-- Pin 8 |___________| ```

Functional Features

• Low noise preamplifier for electret microphones
• Wide gain range adjustable through external resistors
• Shutdown mode for power-saving operation
• Internal bias voltage generation
• Single-supply operation simplifies design

Advantages and Disadvantages

Advantages: - Low input-referred noise for high-quality audio recording - Flexible gain adjustment for various microphone applications - Small package size allows for space-constrained designs - Shutdown mode reduces power consumption

Disadvantages: - Limited output voltage swing may require additional amplification stages for certain applications - Single-supply operation may limit compatibility with certain systems requiring dual supplies

Working Principles

The MAX981CSA+T is a single-supply microphone preamplifier designed to amplify the low-level signals from electret microphones. It operates on a supply voltage range of 2.7V to 5.5V, making it suitable for battery-powered devices. The preamplifier provides a wide gain range that can be adjusted using external resistors, allowing for flexibility in different microphone applications.

The device features low input-referred noise, ensuring high-quality audio recording. It also includes a shutdown mode, which can be used to conserve power when the preamplifier is not in use. The MAX981CSA+T generates an internal bias voltage, simplifying the design by eliminating the need for an external biasing circuit.

Detailed Application Field Plans

The MAX981CSA+T is commonly used in various audio applications, including:

1. Portable Audio Recorders: The low noise and small package size make it ideal for portable recorders, ensuring clear and high-fidelity audio capture.
2. Wireless Microphone Systems: The preamplifier's wide gain range and single-supply operation make it suitable for wireless microphone systems, providing amplification for the microphone signal.
3. Voice-Activated Systems: The device's low noise characteristics and adjustable gain allow it to be used in voice-activated systems, such as voice-controlled assistants or voice recognition systems.

Detailed and Complete Alternative Models

1. MAX4466ESA+: This alternative model offers similar functionality with a slightly different pin configuration. It is available in a 8-SOIC package and has a gain range of 40dB to 60dB.
2. INA217AIDW: This alternative model is a differential microphone preamplifier with adjustable gain. It operates on a dual supply voltage and is available in a 16-SOIC package.

These alternative models can be considered based on specific design requirements and compatibility with the target application.

In conclusion, the MAX981CSA+T is a single-supply microphone preamplifier that provides low noise amplification for electret microphones. Its wide gain range, small package size, and flexible application field plans make it a versatile choice for various audio applications.