NJM2258L

Product Overview

• Category: Integrated Circuit (IC)
• Use: Audio Amplifier
• Characteristics: Low voltage, low noise, high output power
• Package: SOP (Small Outline Package)
• Essence: High-quality audio amplification in a compact form factor
• Packaging/Quantity: Tape and reel packaging, 2500 units per reel

Specifications

• Operating Voltage: 2.5V - 5.5V
• Output Power: 1.4W (at 5V, 10% THD+N, 8Ω load)
• Total Harmonic Distortion + Noise (THD+N): 0.08% (at 1kHz, 1.0W, 8Ω load)
• Signal-to-Noise Ratio (SNR): 90dB (at 1kHz, A-weighted)
• Shutdown Current: 0.1μA (typical)

Detailed Pin Configuration

The NJM2258L IC has a total of 8 pins:

1. VDD: Positive power supply input
2. SD: Shutdown control pin
3. IN+: Non-inverting audio input
4. IN-: Inverting audio input
5. GND: Ground
6. OUT: Audio output
7. Bypass: Bypass capacitor connection
8. VSS: Negative power supply input

Functional Features

• Low voltage operation allows for battery-powered applications
• Low noise ensures high-quality audio reproduction
• High output power enables driving speakers directly
• Shutdown mode for power-saving when not in use
• Built-in bypass capacitor for improved stability

Advantages and Disadvantages

Advantages

• Compact size and easy integration into various devices
• Wide operating voltage range for versatile applications
• Low distortion and high signal-to-noise ratio for clear audio output
• Shutdown mode helps conserve power in portable devices

Disadvantages

• Limited output power compared to higher wattage amplifiers
• Requires external components for proper operation
• Not suitable for high-power audio applications

Working Principles

The NJM2258L is a class AB audio amplifier that operates on low voltage. It utilizes a differential input stage, followed by a push-pull output stage to amplify the audio signal. The IC incorporates various protection circuits to ensure safe operation and prevent damage from overvoltage, overcurrent, and thermal issues.

Detailed Application Field Plans

The NJM2258L is commonly used in portable electronic devices such as:

1. Mobile phones
2. Tablets
3. Portable media players
4. Bluetooth speakers
5. Gaming consoles

Its compact size, low power consumption, and high-quality audio output make it ideal for these applications.

Detailed and Complete Alternative Models

1. TPA3116D2: Class D audio amplifier with higher output power
2. LM386: Low-cost audio amplifier with simpler circuitry
3. MAX9744: Integrated stereo audio amplifier with advanced features

These alternative models offer different specifications and features, catering to diverse application requirements.

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