ZHCSHO6 February 2018 XTR305
PRODUCTION DATA.
- 1 特性
- 2 应用
- 3 说明
- 4 修订历史记录
- 5 Pin Configuration and Functions
-
6 Specifications
- 6.1 Absolute Maximum Ratings
- 6.2 ESD Ratings
- 6.3 Recommended Operating Conditions
- 6.4 Thermal Information
- 6.5 Electrical Characteristics: Voltage Output Mode
- 6.6 Electrical Characteristics: Current Output Mode
- 6.7 Electrical Characteristics: Operational Amplifier (OPA)
- 6.8 Electrical Characteristics: Instrumentation Amplifier (IA)
- 6.9 Electrical Characteristics: Current Monitor
- 6.10 Electrical Characteristics: Power and Digital
- 6.11 Typical Characteristics
- 7 Detailed Description
-
8 Application and Implementation
- 8.1 Application Information
- 8.2
Typical Application
- 8.2.1 Design Requirements
- 8.2.2
Detailed Design Procedure
- 8.2.2.1 Voltage Output Mode
- 8.2.2.2 Current Output Mode
- 8.2.2.3 Input Signal Connection
- 8.2.2.4 Externally-Configured Mode: OPA and IA
- 8.2.2.5 Driver Output Disable
- 8.2.2.6 Driving Capacitive Loads and Loop Compensation
- 8.2.2.7 Internal Current Sources, Switching Noise, and Settling Time
- 8.2.2.8 IA Structure, Voltage Monitor
- 8.2.2.9 Digital I/O and Ground Considerations
- 8.2.2.10 Output Protection
- 8.2.3 Application Curves
- 9 Power Supply Recommendations
- 10Layout
- 11器件和文档支持
- 12机械、封装和可订购信息
8.2.2.4 Externally-Configured Mode: OPA and IA
It is possible to use the precision of the operational amplifier (OPA) and instrumentation amplifier (IA) independently from each other by configuring the digital control pins (M1 high). In this mode, the IA output current is routed to IAOUT and the copy of the OPA output current is routed to IMON, as shown in Figure 37.
This mode allows external configuration of the analog signal routing and feedback loop.
The current output IA has high input impedance, low offset voltage and drift, and very high common-mode rejection ratio. An external resistor (RIA) can be used to convert the output current of the IA (IIA) to an output voltage. The gain is given by Equation 5:
The OPA provides low drift and high voltage output swing that can be used like a common operational amplifier by connecting a feedback network around it. In this mode, the copy of the output current is available at the IMON pin (it includes the current into the feedback network). It provides an output current limit for protection, which can be set between two ranges by M2. The error flag indicates an overcurrent condition, as well as indicating driving the output into the supply rails.
Alternatively, the feedback can be closed through the IMON pin to create a precise voltage-to-current converter.