ZHCSFB6D April 2016 – June 2021 THS4551
PRODUCTION DATA
- 1 特性
- 2 應用
- 3 描述
- 4 Revision History
- 5 Companion Devices
- 6 Pin Configuration and Functions
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7 Specifications
- 7.1 Absolute Maximum Ratings
- 7.2 ESD Ratings
- 7.3 Recommended Operating Conditions
- 7.4 Thermal Information
- 7.5 Electrical Characteristics: (VS+) – (VS–) = 5 V
- 7.6 Electrical Characteristics: (VS+) – (VS–) = 3 V
- 7.7 Typical Characteristics: (VS+) – (VS–) = 5 V
- 7.8 Typical Characteristics: (VS+) – (VS–) = 3 V
- 7.9 Typical Characteristics: 3-V to 5-V Supply Range
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8 Parameter Measurement Information
- 8.1 Example Characterization Circuits
- 8.2 Output Interface Circuit for DC-Coupled Differential Testing
- 8.3 Output Common-Mode Measurements
- 8.4 Differential Amplifier Noise Measurements
- 8.5 Balanced Split-Supply Versus Single-Supply Characterization
- 8.6 Simulated Characterization Curves
- 8.7 Terminology and Application Assumptions
- 9 Detailed Description
- 10Application and Implementation
- 11Power Supply Recommendations
- 12Layout
- 13Device and Documentation Support
- 14Mechanical, Packaging, and Orderable Information
封裝選項
機械數據 (封裝 | 引腳)
散熱焊盤機械數據 (封裝 | 引腳)
訂購信息
9.4.2.1 AC-Coupled, Differential-Input to Differential-Output Design Issues
The most common way to use the THS4551 with an ac-coupled differential source is to simply couple the input into the RG resistors through the blocking capacitors. Figure 9-10 shows a typical blocking capacitor approach to a differential input. An optional input differential termination resistor (RM) is included in this design. The RM element allows the input RG resistors to be scaled up and still delivers lower differential input impedance to the source. In this example, the RG elements sum to show a 1-kΩ differential impedance and the RM element combines in parallel to provide a net 500-Ω ac differential impedance to the source. Again, the design ideally proceeds by selecting the RF element values, then the RG to set the differential gain, and then an RM element (if needed) to achieve a target input impedance. Alternatively, the RM element can be eliminated, with the 2 × RG elements set to the desired input impedance and RF set to obtain the differential gain (equal to RF / RG).
Figure 9-10 Example
AC-Coupled Differential Input DesignThe dc biasing for an ac-coupled differential input design is very simple. The output VOCM is set by the input control voltage and, because there is no dc current path for the output common-mode voltage (as long as RM is only differential and not split and connected to ground for instance), the dc bias also sets the common-mode operating points for the input pins. For a purely differential input, the voltages on the input pins remain fixed at the output VOCM setting and do not move with the input signal (unlike the single-ended input configurations where the input pin common-mode voltages do move with the input signal). The SLOC341 TINA-TI? simulation file is available for Figure 9-10.