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参数

Architecture Voltage FB Number of channels (#) 2 Total supply voltage (Min) (+5V=5, +/-5V=10) 2.5 Total supply voltage (Max) (+5V=5, +/-5V=10) 12 GBW (Typ) (MHz) 40 BW @ Acl (MHz) 55 Acl, min spec gain (V/V) 1 Slew rate (Typ) (V/us) 22 Vn at flatband (Typ) (nV/rtHz) 17 Vn at 1 kHz (Typ) (nV/rtHz) 17 Iq per channel (Typ) (mA) 0.725 Vos (offset voltage @ 25 C) (Max) (mV) 3 Rail-to-rail In, Out Rating Catalog Operating temperature range (C) -40 to 85 CMRR (Typ) (dB) 84 Input bias current (Max) (pA) 2000000 Offset drift (Typ) (uV/C) 5 Output current (Typ) (mA) 20 2nd harmonic (dBc) 62 3rd harmonic (dBc) 72 @ MHz 1 open-in-new 查找其它 高速 运算放大器 (GBW>=50MHz)

封装|引脚|尺寸

SOIC (D) 8 19 mm² 4.9 x 3.9 VSSOP (DGK) 8 15 mm² 3 x 4.9 open-in-new 查找其它 高速 运算放大器 (GBW>=50MHz)

特性

  • (VS = 2.7V, TA = 25°C, RL = 1kΩ to V+/2, AV = +1.
    Typical Values Unless Specified.
  • −3dB BW 55 MHz
  • Supply Voltage Range 2.5 V to 12 V
  • Slew Rate 22 V/µs
  • Supply Current 650 µA/channel
  • Output Short Circuit Current 42 mA
  • Linear Output Current ±20 mA
  • Input Common Mode Voltage 0.3 V Beyond Rails
  • Output Voltage Swing 20 mV from Rails 
  • Input Voltage Noise 17 nV/√Hz
  • Input Current Noise 0.75 pA/√Hz
open-in-new 查找其它 高速 运算放大器 (GBW>=50MHz)

描述

The LMH6645 (single) and LMH6646 (dual), rail-to-rail input and output voltage feedback amplifiers, offer high speed (55 MHz), and low voltage operation (2.7 V) in addition to micro-power shutdown capability (LMH6647, single).

Input common mode voltage range exceeds either supply by 0.3 V, enhancing ease of use in multitude of applications where previously only inferior devices could be used. Output voltage range extends to within 20 mV of either supply rails, allowing wide dynamic range especially in low voltage applications. Even with low supply current of 650 µA/amplifier, output current capability is kept at a respectable ±20 mA for driving heavier loads. Important device parameters such as BW, Slew Rate and output current are kept relatively independent of the operating supply voltage by a combination of process enhancements and design architecture.

In portable applications, the LMH6647 provides shutdown capability while keeping the turn-off current to less than 50 µA. Both turn-on and turn-off characteristics are well behaved with minimal output fluctuations during transitions. This allows the part to be used in power saving mode, as well as multiplexing applications. Miniature packages (SOT-23, VSSOP-8, and SOIC-8) are further means to ease the adoption of these low power high speed devices in applications where board area is at a premium.

open-in-new 查找其它 高速 运算放大器 (GBW>=50MHz)
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open-in-new 产品比较
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LMH6612 正在供货 单电源、双路 345 MHz 轨至轨输出放大器 For lower noise(10nV/rtHz), lower offset(0.75mV) & lower drift(0.8uV/C)

技术文档

设计与开发

有关其他条款或所需资源,请点击下面的任何链接来查看详情页面。

硬件开发

评估板 下载
document-generic 用户指南
$10.00
说明

National Semiconductor offers this unpopulated Evaluation Board to aid in the evaluation and testing of high-speed Op Amp that are offered in the 8-Pin MSOP package. Resistors, capacitors, or any other surface-mount components can be easily mounted on this board in the desired circuit configuration (...)

特性
  • Accommodates various high-speed Op Amp
  • Allows quick and easy evaluation
  • Serves as reference design to aid in high-speed PCB layout
  • Utilizes surface-mount components

 

设计工具和仿真

仿真模型 下载
SNOM139.ZIP (1 KB) - PSpice Model
仿真工具 下载
document-generic 用户指南 document-generic 下载英文版本 (Rev.A)
计算工具 下载
模拟工程师计算器
ANALOG-ENGINEER-CALC — 模拟工程师计算器旨在加快模拟电路设计工程师经常使用的许多重复性计算。该基于 PC 的工具提供图形界面,其中显示各种常见计算的列表(从使用反馈电阻器设置运算放大器增益到为稳定模数转换器 (ADC) 驱动器缓冲器电路选择合适的电路设计元件)。除了可用作单独的工具之外,该计算器还能够很好地与模拟工程师口袋参考书中所述的概念配合使用。
特性
  • 通过模数转换器 (ADC) 和数模转换器 (DAC) 加快电路设计
    • 噪声计算
    • 常见单位转换
  • 解决常见的放大器电路设计问题
    • 使用标准电阻器进行增益选择
    • 滤波器配置
    • 常见放大器配置的总噪声
  • 执行 PCB 寄生计算(例如 R、L 和 C)
  • 查找常见传感器的传感器输出值(例如 RTD、热电偶)
  • 解决常见无源电路问题(例如使用无源组件的分压器)
计算工具 下载
分压器确定一组分压电阻
VOLT-DIVIDER-CALC VOLT-DIVIDER-CALC quickly determines a set of resistors for a voltage divider. This KnowledgeBase Javascript utility can be used to find a set of resistors for a voltage divider to achieve the desired output voltage. This calculator can also be used to design non-inverting attentuation circuits.

(...)

CAD/CAE 符号

封装 引脚 下载
SOIC (D) 8 视图选项
VSSOP (DGK) 8 视图选项

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