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MAX9814ETD from MAX,MAXIM - Dallas Semiconductor

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MAX9814ETD

Manufacturer: MAX, MAXIM

Microphone Amplifier with AGC and Low-Noise Microphone Bias

Partnumber Manufacturer Quantity Availability
MAX9814ETD MAX, MAXIM 10031 In Stock

Description and Introduction

Microphone Amplifier with AGC and Low-Noise Microphone Bias The MAX9814ETD is a microphone amplifier with automatic gain control (AGC) and low-noise microphone bias from Maxim Integrated (now part of Analog Devices).  

### **Specifications:**  
- **Manufacturer:** Maxim Integrated (now Analog Devices)  
- **Package:** TDFN-14 (3mm x 3mm)  
- **Supply Voltage:** 2.7V to 5.5V  
- **Quiescent Current:** 600µA (typical)  
- **Gain Range:** Adjustable (40dB, 50dB, 60dB) via external resistors  
- **AGC Range:** Up to 60dB  
- **THD (Total Harmonic Distortion):** 0.04% (typical)  
- **PSRR (Power Supply Rejection Ratio):** 70dB (typical)  
- **Input-Referred Noise:** 30nV/√Hz (typical)  
- **Microphone Bias Voltage:** 2V (adjustable)  
- **Operating Temperature Range:** -40°C to +85°C  

### **Descriptions:**  
The MAX9814ETD is a low-power, high-performance microphone amplifier with integrated AGC and low-noise bias for electret microphones. It features a low-noise preamplifier, variable gain control, and AGC to maintain consistent output levels under varying input conditions.  

### **Features:**  
- Automatic Gain Control (AGC) with adjustable attack/release times  
- Low-noise microphone bias (adjustable)  
- Selectable gain settings (40dB, 50dB, 60dB)  
- Low quiescent current (600µA typical)  
- High PSRR (70dB) for noise immunity  
- Wide supply voltage range (2.7V to 5.5V)  
- Small TDFN-14 package for space-constrained designs  

This device is commonly used in voice recording, communication systems, and audio processing applications.

Application Scenarios & Design Considerations

Microphone Amplifier with AGC and Low-Noise Microphone Bias

Alternative Part Number

  • LMV1012UP-15 --: Microphone preamplifier with similar gain and low-noise audio function, suitable drop-in for many MAX9814 audio front-end designs.
  • ADMP401 --: Integrated MEMS microphone with built-in preamp, often used as a functional replacement in audio capture circuits requiring compact electret-style input.
  • SSM2167 --: Low-voltage microphone preamp with AGC-like compression, offering comparable signal conditioning for microphone input stages.

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