ZHCSCW7D October 2014 – February 2018 LMH5401
PRODUCTION DATA.
- 1 特性
- 2 應用
- 3 說明
- 4 修訂歷史記錄
- 5 Pin Configuration and Functions
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6 Specifications
- 6.1 Absolute Maximum Ratings
- 6.2 ESD Ratings
- 6.3 Recommended Operating Conditions
- 6.4 Thermal Information
- 6.5 Electrical Characteristics: VS = 5 V
- 6.6 Electrical Characteristics: VS = 3.3 V
- 6.7 Typical Characteristics: 5 V
- 6.8 Typical Characteristics: 3.3 V
- 6.9 Typical Characteristics: 3.3-V to 5-V Supply Range
- 7 Parameter Measurement Information
- 8 Detailed Description
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9 Application and Implementation
- 9.1 Application Information
- 9.2 Typical Application
- 9.3 Do's and Don'ts
- 10Power Supply Recommendations
- 11Layout
- 12器件和文檔支持
- 13機械、封裝和可訂購信息
9.2.2.4.3 ADC Input Common-Mode Voltage Considerations : AC-Coupled Input
The input common-mode voltage range of the ADC must be respected for proper operation. In an AC-coupled application between the amplifier and the ADC, the input common-mode voltage bias of the ADC is accomplished in different ways depending on the ADC. Some ADCs use internal bias networks such that the analog inputs are automatically biased to the required input common-mode voltage if the inputs are AC-coupled with capacitors (or if the filter between the amplifier and ADC is a band-pass filter). Other ADCs supply the required input common-mode voltage from a reference voltage output pin (often called CM or VCM). With these ADCs, the AC-coupled input signal can be re-biased to the input common-mode voltage by connecting resistors from each input to the CM output of the ADC, as Figure 69 shows. However, the signal is attenuated because of the voltage divider created by RCM and RO.
Figure 69. Biasing AC-Coupled ADC Inputs Using the ADC CM Output
The signal can be re-biased when ac coupling; thus, the output common-mode voltage of the amplifier is a don’t care for the ADC.