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MAX4287EUA from MAX,MAXIM - Dallas Semiconductor

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MAX4287EUA

Manufacturer: MAX, MAXIM

+3V/+5V / 250MHz / SOT23 ADC Buffer Amplifiers with High-Speed Disable

Partnumber Manufacturer Quantity Availability
MAX4287EUA MAX, MAXIM 32 In Stock

Description and Introduction

+3V/+5V / 250MHz / SOT23 ADC Buffer Amplifiers with High-Speed Disable The MAX4287EUA is a high-speed, low-power operational amplifier (op-amp) manufactured by Maxim Integrated (now part of Analog Devices). Below are the factual specifications, descriptions, and features from Ic-phoenix technical data files:

### **Specifications:**
- **Manufacturer:** Maxim Integrated (Analog Devices)  
- **Part Number:** MAX4287EUA  
- **Package:** 8-pin µMAX (MSOP)  
- **Supply Voltage Range:** ±2.5V to ±6V (Dual Supply), 5V to 12V (Single Supply)  
- **Input Offset Voltage:** 0.5mV (max)  
- **Input Bias Current:** 1pA (typ)  
- **Gain Bandwidth Product (GBWP):** 50MHz  
- **Slew Rate:** 30V/µs  
- **Quiescent Current:** 3.5mA (per amplifier)  
- **Output Current:** ±50mA  
- **Operating Temperature Range:** -40°C to +85°C  
- **Common-Mode Rejection Ratio (CMRR):** 80dB (min)  
- **Power Supply Rejection Ratio (PSRR):** 80dB (min)  

### **Description:**  
The MAX4287EUA is a high-speed, low-power operational amplifier designed for applications requiring wide bandwidth and fast settling time. It features a unity-gain stable architecture, making it suitable for active filters, video amplifiers, and data acquisition systems.  

### **Features:**  
- **High-Speed Performance:** 50MHz GBWP and 30V/µs slew rate.  
- **Low Power Consumption:** 3.5mA per amplifier quiescent current.  
- **Low Input Bias Current:** 1pA (typ).  
- **Wide Supply Range:** Operates from ±2.5V to ±6V (dual supply) or 5V to 12V (single supply).  
- **Rail-to-Rail Output:** Provides maximum dynamic range.  
- **Unity-Gain Stable:** No external compensation required.  
- **Low Offset Voltage:** 0.5mV (max) ensures precision.  
- **Short-Circuit Protection:** Robust output drive capability.  

This information is based solely on the manufacturer's datasheet and technical documentation.

Application Scenarios & Design Considerations

+3V/+5V / 250MHz / SOT23 ADC Buffer Amplifiers with High-Speed Disable# Technical Documentation: MAX4287EUA Precision Amplifier

 Manufacturer : Maxim Integrated (now part of Analog Devices)
 Component : MAX4287EUA - Low-Cost, Precision, High-Speed Operational Amplifier
 Package : 8-pin µMAX (UMAX)

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## 1. Application Scenarios

### Typical Use Cases
The MAX4287EUA is a precision, high-speed operational amplifier designed for applications requiring excellent DC accuracy combined with wide bandwidth. Its key specifications make it suitable for:

*    High-Impedance Sensor Interface:  Its low input bias current (1pA typical) and low offset voltage (150µV max) make it ideal for amplifying signals from piezoelectric sensors, photodiodes, and other high-impedance sources without significant loading or DC error introduction.
*    Active Filtering:  With a gain-bandwidth product (GBWP) of 10MHz and a slew rate of 5V/µs, it is well-suited for implementing active filters (e.g., Sallen-Key, multiple-feedback) in the audio range and for signal conditioning up to several hundred kilohertz.
*    Precision Data Acquisition Front-Ends:  The combination of low noise (14nV/√Hz) and high DC precision allows it to serve as a buffer or gain stage preceding high-resolution Analog-to-Digital Converters (ADCs) in measurement and instrumentation systems.
*    Voltage Followers/Buffers:  Its high input impedance and low output impedance enable it to effectively isolate sensitive signal sources from subsequent stages of a circuit.

### Industry Applications
*    Test & Measurement Equipment:  Used in precision multimeters, signal generators, and data logger front-ends for accurate signal amplification.
*    Medical Instrumentation:  Suitable for portable medical devices like ECG monitors, pulse oximeters, and patient monitoring systems where signal integrity and low power consumption are critical.
*    Industrial Process Control:  Employed in transducer signal conditioning for pressure, temperature, and flow sensors in 4-20mA loops or direct measurement systems.
*    Professional Audio:  Can be used in microphone pre-amplifiers, equalizers, and mixing consoles where low noise and distortion are paramount.
*    Automotive Sensing:  Applicable in precision sensor interfaces for position, pressure, or proximity sensing modules.

### Practical Advantages and Limitations
 Advantages: 
*    Excellent DC Precision:  Low offset voltage and drift minimize errors in DC and low-frequency applications.
*    Low Noise:  The low voltage noise density preserves signal integrity for small-amplitude signals.
*    Rail-to-Rail Output:  The output swings to within millivolts of both supply rails, maximizing dynamic range in low-supply-voltage systems.
*    Single-Supply Operation:  Can operate from a single +2.7V to +6V supply, simplifying power architecture in portable and battery-powered devices.
*    Low Power Consumption:  Typically draws 1.1mA of supply current, beneficial for power-sensitive designs.

 Limitations: 
*    Moderate Speed:  While "high-speed" for precision amps, its 10MHz GBWP and 5V/µs slew rate are not suitable for RF, video, or very high-speed digital interface applications.
*    Limited Output Current:  The output can typically source/sink around 30mA, which may be insufficient for driving heavy capacitive loads or low-impedance loads directly.
*    Not Fully Rail-to-Rail Input:  The input common-mode voltage range extends from (V-) to (V+ - 1.2V). It cannot handle signals at the positive rail, which must be considered in single-supply designs.

---

## 2. Design Considerations

### Common Design Pitfalls and Solutions
1.   Instability with Capacitive Loads: 
    *

Alternative Part Number

  • LT1789CMS8-1 --: Precision instrumentation amplifier in MSOP-8 with similar supply range and low offset, suitable functional replacement for MAX4287EUA.
  • INA128UA --: Widely available precision instrumentation amplifier in SOIC-8 offering comparable gain and offset performance for signal conditioning applications.
  • AD620ARZ --: Classic low-cost instrumentation amplifier with similar gain bandwidth and offset characteristics, usable as an alternative with minor layout adaptation.
  • LT1789CMS8 --: Similar precision instrumentation amplifier in MSOP-8 package with comparable supply range and performance, suitable drop-in replacement for many MAX4287 applications.
  • AD8221ARMZ --: High-performance instrumentation amplifier in MSOP-8 with low gain drift and excellent CMRR, close functional match to the MAX4287 for precision signal conditioning.

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