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参数资料
| 型号： | PGA309EVM |
| 厂商： | Texas Instruments, Inc. |
| 英文描述： | PGA309 Evaluation Module(PGA309评估模块) |
| 中文描述： | PGA309评估模块（PGA309评估模块） |
| 文件页数： | 35/53页 |
| 文件大小： | 4221K |
| 代理商： | PGA309EVM |
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8.0 PGA309 Calculator (Software for Gain/Offset Calculation and Simulation)
The PGA309 Calculator is a software program that helps to calculate initial gain and offset settings based on
your sensor information. The tool also checks to see if the design violates any of the PGA309 specifications.
To start the PGA309 Calculator, you select the “PGA309 Calculator” under the “Start” menu, “All Programs”,
“PGA309 Designer’s Kit” as shown in Figure 28.
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Figure 28: Starting the PGA309 Calculator
The PGA309 Calculator software will appear as shown in Figure 29. The program requires that you enter the
following information about the PGA309: the reference (Vref), the sensor excitation (Vexc), the desired output
swing, and the power supply voltage (Vsa). The program also requires that you enter the following information
about the sensor: the bridge resistance, the offset, and the span of the sensor. Note that if you plan on using
the Rt method for temperature measurement, you should also enter Rt. Also, you can choose to enter the full
scale output, and offset of the sensor rather then the span and offset.
When all the sensor and PGA309 information is entered, press the “Compute Constants” button to calculate
the gain, and offset settings for the PGA309. Since there are multiple gain stages in the PGA309, there are
many different configurations that can be used to achieve any given gain value. For example, a gain of 500
can be achieved with Front End PGA Gain = 64, Output Amplifier Gain = 2, and Gain DAC = 0.781. A gain of
500 can also be achieved with Front End PGA Gain = 42.67, Output Amplifier Gain = 2.4, and Gain DAC =
0.976. The algorithm that the calculator uses chooses a gain combination that forces the Gain DAC as close
to mid scale as possible (Gain DAC=0.667 is ideal). The algorithm also chooses the larges possible Front End
PGA Gain to minimize noise. A similar algorithm is used for offset in that the Coarse Offset is selected to set
the Offset DAC to mid scale. Setting the Offset and Gain DAC to mid scale allows for the maximum PGA309
adjustment range to compensate for sensor drift.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| PGA309EVM-EU | 功能描述:光学传感器开发工具 PGA309 Eval Mod- Wldwide RoHS:否 制造商:ams 工具用于评估: 接口类型: 最大工作温度: |
| PGA309EVM-US | 功能描述:光学传感器开发工具 PGA309 Eval Mod- US & Canada RoHS:否 制造商:ams 工具用于评估: 接口类型: 最大工作温度: |
| PGA309EVM-USB | 功能描述:放大器 IC 开发工具 PGA309 Eval Mod RoHS:否 制造商:International Rectifier 产品:Demonstration Boards 类型:Power Amplifiers 工具用于评估:IR4302 工作电源电压:13 V to 23 V |
| PGA309EVM-USB | 制造商:Texas Instruments 功能描述:ANALOG SIGNAL CONDITIONING EVAL. MODULE |
| PGA309-HT | 制造商:TI 制造商全称:Texas Instruments 功能描述:VOLTAGE OUTPUT PROGRAMMABLE SENSOR CONDITIONER |
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