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LMH6702MF from NS,National Semiconductor

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LMH6702MF

Manufacturer: NS, NS,NS

1.7 GHz, Ultra Low Distortion, Wideband Op Amp

Partnumber Manufacturer Quantity Availability
LMH6702MF NS, NS,NS 24133 In Stock

Description and Introduction

1.7 GHz, Ultra Low Distortion, Wideband Op Amp The LMH6702MF is a high-speed, low-power operational amplifier manufactured by Texas Instruments (TI). Here are its key specifications, descriptions, and features:

### **Specifications:**  
- **Manufacturer:** Texas Instruments (NS refers to National Semiconductor, which was acquired by TI)  
- **Package:** SOT-23 (5-pin)  
- **Supply Voltage Range:** ±2.5V to ±6V (5V to 12V total)  
- **Bandwidth:** 1.7 GHz (Gain = +2)  
- **Slew Rate:** 4100 V/µs  
- **Input Noise Voltage:** 2.2 nV/√Hz  
- **Input Bias Current:** 5 µA (typical)  
- **Operating Temperature Range:** -40°C to +85°C  
- **Input Offset Voltage:** ±1 mV (typical)  
- **Quiescent Current:** 6.5 mA (typical)  

### **Descriptions:**  
- The LMH6702MF is a wideband, voltage-feedback operational amplifier optimized for high-speed signal processing.  
- It is designed for applications requiring high bandwidth, low distortion, and low power consumption.  
- The device is available in a small SOT-23 package for space-constrained designs.  

### **Features:**  
- **High Bandwidth:** 1.7 GHz at a gain of +2  
- **Fast Slew Rate:** 4100 V/µs for rapid signal response  
- **Low Distortion:** Suitable for high-fidelity signal processing  
- **Low Power Consumption:** 6.5 mA typical supply current  
- **Wide Supply Range:** Operates from ±2.5V to ±6V  
- **Small Package:** SOT-23 for compact PCB designs  

This information is based on the manufacturer's datasheet. For detailed performance characteristics, refer to the official Texas Instruments documentation.

Application Scenarios & Design Considerations

1.7 GHz, Ultra Low Distortion, Wideband Op Amp# Technical Datasheet: LMH6702MF High-Speed Operational Amplifier

## 1. Application Scenarios

### 1.1 Typical Use Cases
The LMH6702MF is a high-speed, wideband operational amplifier designed for applications requiring exceptional signal fidelity and speed. Its primary use cases include:

*    Video Distribution and Switching:  The amplifier's high bandwidth (1.7 GHz, -3 dB) and excellent differential gain/phase performance (0.01%/0.01° at 3.58 MHz) make it ideal for driving multiple video loads (75 Ω) in broadcast equipment, video routers, and professional video interfaces.
*    High-Speed Signal Buffering:  It serves as an excellent buffer or line driver in high-frequency data acquisition systems, test and measurement equipment, and communication infrastructure, isolating sensitive stages from load variations.
*    Active Filtering:  Its gain flatness and low distortion characteristics allow for use in high-frequency active filter designs, such as anti-aliasing filters for high-speed analog-to-digital converters (ADCs) or reconstruction filters for digital-to-analog converters (DACs).
*    Pulse Amplification:  With a fast slew rate (3100 V/µs) and short settling time, the device is suitable for amplifying and conditioning fast digital pulses or analog signals in time-domain applications like oscilloscope front-ends and radar systems.

### 1.2 Industry Applications
*    Professional Broadcast & AV:  Used in production switchers, video servers, and distribution amplifiers for SD/HD/3G-SDI signals.
*    Test & Measurement:  Found in the signal path of high-bandwidth oscilloscopes, arbitrary waveform generators, and automatic test equipment (ATE).
*    Communications:  Employed in RF/IF signal chain stages, clock distribution networks, and high-speed data line drivers.
*    Medical Imaging:  Suitable for the analog front-end of ultrasound and other high-speed imaging systems where signal integrity is paramount.

### 1.3 Practical Advantages and Limitations
 Advantages: 
*    High Bandwidth:  1.7 GHz small-signal bandwidth supports signals well into the RF range.
*    Low Distortion:  Excellent harmonic distortion performance (e.g., -85 dBc SFDR at 5 MHz) preserves signal purity.
*    Low Noise:  Input voltage noise of 2.2 nV/√Hz provides a good signal-to-noise ratio for sensitive applications.
*    Disable Function:  The `SHDN` (shutdown) pin allows the amplifier to be placed in a low-power standby mode, reducing system power consumption and enabling multiplexing.
*    Stable Operation:  Unity-gain stable, simplifying design by eliminating the need for external compensation.

 Limitations: 
*    Power Supply Sensitivity:  As a high-speed device, it requires careful power supply decoupling. Noise or instability on the supply rails will directly degrade performance.
*    Thermal Considerations:  In the small SOT-23-5 (MF) package, power dissipation is limited. Driving heavy resistive loads or operating at high supply voltages can cause significant junction temperature rise.
*    Output Current:  While capable of driving video loads, its output current (typ. ±85 mA) may be insufficient for directly driving very low impedance or highly capacitive loads without risk of instability or bandwidth reduction.
*    Cost:  Typically higher cost than general-purpose op-amps, justified by its high-performance specifications.

## 2. Design Considerations

### 2.1 Common Design Pitfalls and Solutions
*    Pitfall 1: Oscillations or Ringing. 
    *    Cause:  Insufficient power supply decoupling, poor PCB layout (long traces, high inductance), or driving a highly capacitive load.
    *    Solution:  Implement rigorous decoupling (see

Alternative Part Number

  • OPA695IDBVR --: High-speed current-feedback op-amp in SOT-23-5 with comparable bandwidth and slew rate, direct functional substitute.
  • AD8009ARZ --: Very high-speed current-feedback amplifier offering similar gain-bandwidth performance, suitable replacement in most signal-chain designs.
  • THS3201DBVR --: Wideband current-feedback op-amp in SOT-23-5 package with comparable AC specifications and supply range.

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