ZHCSH86B December   2017  – February 2019 LMH5401-SP

PRODUCTION DATA.  

  1. 1 特性
  2. 2 应用
  3. 3 说明
    1.     Device Images
      1.      LMH5401-SP 小信号频率响应
      2.      LMH5401-SP 驱动 ADC12D1620QML
  4. 4 修订历史记录
  5. 5 说明 （续）
  6. 6 Pin Configuration and Functions
    1.     Pin Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics: VS = 5 V
    6. 7.6 Electrical Characteristics: VS = 3.3 V
    7. 7.7 Typical Characteristics: 5 V
    8. 7.8 Typical Characteristics: 3.3 V
  8. 8 Parameter Measurement Information
    1. 8.1  Output Reference Nodes and Gain Nomenclature
    2. 8.2  ATE Testing and DC Measurements
    3. 8.3  Frequency Response
    4. 8.4  S-Parameters
    5. 8.5  Frequency Response with Capacitive Load
    6. 8.6  Distortion
    7. 8.7  Noise Figure
    8. 8.8  Pulse Response, Slew Rate, and Overdrive Recovery
    9. 8.9  Power Down
    10. 8.10 VCM Frequency Response
    11. 8.11 Test Schematics
  9. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1 Fully-Differential Amplifier
      2. 9.3.2 Operations for Single-Ended to Differential Signals
        1. 9.3.2.1 AC-Coupled Signal Path Considerations for Single-Ended Input to Differential Output Conversion
        2. 9.3.2.2 DC-Coupled Input Signal Path Considerations for SE-DE Conversions
        3. 9.3.2.3 Resistor Design Equations for Single-to-Differential Applications
        4. 9.3.2.4 Input Impedance Calculations
      3. 9.3.3 Differential-to-Differential Signals
        1. 9.3.3.1 AC-Coupled, Differential-Input to Differential-Output Design Issues
        2. 9.3.3.2 DC-Coupled, Differential-Input to Differential-Output Design Issues
      4. 9.3.4 Output Common-Mode Voltage
    4. 9.4 Device Functional Modes
      1. 9.4.1 Operation With a Split Supply
      2. 9.4.2 Operation With a Single Supply
  10. 10Application and Implementation
    1. 10.1 Application Information
      1. 10.1.1 Stability, Noise Gain, and Signal Gain
      2. 10.1.2 Input and Output Headroom Considerations
      3. 10.1.3 Noise Analysis
      4. 10.1.4 Noise Figure
      5. 10.1.5 Thermal Considerations
    2. 10.2 Typical Application
      1. 10.2.1 Design Requirements
      2. 10.2.2 Detailed Design Procedure
        1. 10.2.2.1 Driving Matched Loads
        2. 10.2.2.2 Driving Unmatched Loads For Lower Loss
        3. 10.2.2.3 Driving Capacitive Loads
        4. 10.2.2.4 Driving ADCs
          1. 10.2.2.4.1 SNR Considerations
          2. 10.2.2.4.2 SFDR Considerations
          3. 10.2.2.4.3 ADC Input Common-Mode Voltage Considerations—AC-Coupled Input
          4. 10.2.2.4.4 ADC Input Common-Mode Voltage Considerations—DC-Coupled Input
        5. 10.2.2.5 GSPS ADC Driver
        6. 10.2.2.6 Common-Mode Voltage Correction
        7. 10.2.2.7 Active Balun
      3. 10.2.3 Application Curves
    3. 10.3 Do's and Don'ts
      1. 10.3.1 Do:
      2. 10.3.2 Don't:
  11. 11Power Supply Recommendations
    1. 11.1 Supply Voltage
    2. 11.2 Single Supply
    3. 11.3 Split Supply
    4. 11.4 Supply Decoupling
  12. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Example
  13. 13器件和文档支持
    1. 13.1 器件支持
      1. 13.1.1 器件命名规则
    2. 13.2 文档支持
      1. 13.2.1 相关文档
    3. 13.3 接收文档更新通知
    4. 13.4 社区资源
    5. 13.5 商标
    6. 13.6 静电放电警告
    7. 13.7 术语表
  14. 14机械、封装和可订购信息

封装选项

机械数据 (封装 | 引脚)
散热焊盘机械数据 (封装 | 引脚)
订购信息

8.3 Frequency Response

This test is run with both single-ended inputs and differential inputs.

For tests with single-ended inputs, the standard EVM is used with no changes; see Figure 54. In order to provide a matched input, the unused input requires a broadband 50-Ω termination to be connected. When using a four-port network analyzer, the unused input can either be terminated with a broadband load, or can be connected to the unused input on the four-port analyzer. The network analyzer provides proper termination. A network analyzer is connected to the input and output of the EVM with 50-Ω coaxial cables and is set to measure the forward transfer function (s21). The input signal frequency is swept with the signal level set for the desired output amplitude.

The LMH5401-SP is fully symmetrical, either input (IN+ or IN–) can be used for single-ended inputs. The unused input must be terminated. RF, RG1, and RG2 determine the gain. RT and RM enable matching to the source resistance. See the Test Schematics section for more information on setting these resistors per gain and source impedance requirements. Bandwidth is dependant on gain settings because this device is a voltage feedback amplifier. With a GBP of 6.5 GHz, the approximate bandwidth can be calculated for a specific application requirement, as shown in Equation 2. Figure 55 illustrates a test schematic for differential input and output.

Equation 2. GBP (Hz) = BW (Hz) × Noise Gain

For tests with differential inputs, the same setup for single-ended inputs is used except all four connectors are connected to a network analyzer port. Measurements are made in either true differential mode on the Rohde & Schwarz® network analyzer or in calculated differential mode. In both cases, the differential inputs are each driven with a 50-Ω source. Table 2 and Table 3 list resistor values for various gain settings.

Table 2. Differential Input/Output

AV (V/V) RG1, RG2 (Ω) RF (Total / External, Ω) RT (Ω)
2 100 199 / 174 100
4 49.9 199 / 174 N/A
6 49.9 300 / 274 N/A
8 49.9 400 / 375 N/A
10 49.9 500 / 475 N/A

Table 3. SE Input

AV (V/V) RG1 (Ω) RT (Ω) RG2 (Ω) RF (Total / External, Ω)
2 90.9 76.8 121 200 / 175
4 22.6 357 66.5 152 / 127
8 12.1 1100 60.4 250 / 225
10 9.76 1580 57.6 300 / 275
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