LM4938MHX/NOPB

Product Overview

• Category: Integrated Circuit (IC)
• Use: Audio Amplifier
• Characteristics: High-performance, low-power stereo audio subsystem
• Package: 32-WQFN (5x5) package
• Essence: Provides high-quality audio amplification and signal processing capabilities
• Packaging/Quantity: Available in tape and reel packaging, quantity varies based on supplier

Specifications

• Power Supply Voltage: 2.7V to 5.5V
• Output Power: Up to 1.3W per channel into 8Ω load at 5V supply voltage
• Total Harmonic Distortion + Noise: 0.03% at 1kHz, 1.2W output power
• Signal-to-Noise Ratio: 95dB at 1kHz, 1.2W output power
• Shutdown Current: 0.01μA (typical)
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

The LM4938MHX/NOPB has a 32-pin WQFN package with the following pin configuration:

1. VDDIO
2. SDZ
3. SDA
4. SCL
5. GND
6. LOUTN
7. LOUTP
8. LINP
9. LINN
10. SHUTDOWN
11. ROUTN
12. ROUTP
13. RINP
14. RINN
15. VDDA
16. VDD
17. AGND
18. BYPASS
19. AVDD
20. VREF
21. MICBIAS
22. MICIN1P
23. MICIN1N
24. MICIN2P
25. MICIN2N
26. MICBIAS2
27. MICBIAS1
28. VDDPLL
29. PLLVSS
30. PLLSDA
31. PLLSCL
32. NC

Functional Features

• High-quality audio amplification and signal processing
• Stereo headphone amplifier with selectable gain
• Integrated microphone bias voltage for electret microphones
• Programmable digital filters for bass/treble control
• Automatic level control (ALC) for microphone input
• Pop and click suppression during power-up and shutdown

Advantages and Disadvantages

Advantages: - High-performance audio amplification - Low-power consumption - Integrated microphone bias voltage simplifies design - Programmable filters allow customization of audio output - ALC ensures consistent microphone input levels - Pop and click suppression enhances user experience

Disadvantages: - Limited output power compared to higher wattage amplifiers - Requires external components for complete audio subsystem implementation

Working Principles

The LM4938MHX/NOPB is an integrated audio subsystem that combines a stereo headphone amplifier, microphone bias voltage generation, and programmable digital filters. It operates on a low voltage supply and provides high-quality audio amplification while consuming minimal power. The device includes features like automatic level control, pop and click suppression, and customizable bass/treble control.

Detailed Application Field Plans

The LM4938MHX/NOPB is suitable for various applications, including but not limited to:

1. Mobile phones and smartphones
2. Portable media players
3. Tablets and laptops
4. Gaming consoles
5. Bluetooth speakers
6. Wearable devices

Alternative Models

1. LM4863: Dual 2.2W Audio Amplifier
2. TPA3110D2: 15-W Stereo Class-D Audio Power Amplifier
3. MAX98357A: Mono Class D Speaker Amplifier

These alternative models offer similar functionality and can be considered as alternatives to the LM4938MHX/NOPB based on specific requirements and design constraints.

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