Overview
The INA237AIDGSR, manufactured by Texas Instruments, is an ultra-precise digital power monitor designed specifically for current-sensing applications. This device features a high-resolution 16-bit delta-sigma ADC and is capable of measuring current, bus voltage, temperature, and power. It operates from a supply voltage range of 2.7 V to 5.5 V and supports common-mode voltage from –0.3 V to +85 V. The INA237AIDGSR is tailored for applications requiring high accuracy, low noise, and versatile measurement capabilities.
Key Specifications
| Specification | Value |
|---|---|
| Supply Voltage | 2.7 V to 5.5 V |
| Quiescent Current | 640 µA (typical), 1.1 mA (maximum at –40°C to +125°C) |
| Shutdown Current | 5 µA (maximum) |
| Input Offset Voltage | ±50 µV (maximum) |
| Gain Error | ±0.3% (maximum) |
| Gain Error Drift | ±50 ppm/°C (maximum) |
| Common Mode Rejection | 120 dB (minimum) |
| Power Monitoring Accuracy | 1.6% full scale, –40°C to +125°C (maximum) |
| Shunt Full-Scale Differential Range | ±163.84 mV / ±40.96 mV |
| Input Bias Current | 2.5 nA (maximum) |
| Temperature Sensor Accuracy | ±1°C (maximum at 25°C) |
| ADC Conversion Time | 50 µs to 4.12 ms |
| Sample Averaging | 1x to 1024x |
Key Features
The INA237AIDGSR boasts several key features that make it highly suitable for precise current-sensing applications:
- High-Resolution 16-Bit Delta-Sigma ADC: Provides high-performance, low-offset, and low-drift measurements.
- Low Offset and Gain Drift: Ensures accurate measurements without the need for multi-temperature calibration during manufacturing.
- Wide Common-Mode Range: Supports common-mode voltage from –0.3 V to +85 V, allowing it to measure voltage and current on high-voltage rails.
- Programmable Conversion Time and Averaging: Allows for flexible configuration of measurement precision and noise reduction through sample averaging.
- Integrated Temperature Sensor: Provides accurate die temperature measurement and can be used to monitor system ambient temperature.
- Fast Alert Response: Features a fast alert response time of 75 µs, useful for real-time monitoring and fault detection.
- Low Input Bias Current: Permits the use of larger current-sense resistors for accurate current measurements in the micro-amp range.
Applications
The INA237AIDGSR is versatile and can be applied in various fields, including:
- DC/DC Converters and Power Inverters: For precise current and voltage monitoring in power conversion systems.
- Industrial Battery Packs: To monitor and manage battery health and performance.
- Power-over-Ethernet (PoE): For accurate power delivery and monitoring in PoE systems.
- Telecom Equipment and Enterprise Servers: To ensure reliable and efficient power management in telecommunications and server systems.
- Data Acquisition Systems: For amplifying and conditioning low-level sensor signals with high accuracy.
- Medical Devices: In patient monitoring equipment and other medical instrumentation requiring precise signal conditioning.
- Industrial Automation: For monitoring and control systems that require precise signal amplification and conditioning.
- Test and Measurement Equipment: For accurate signal conditioning and amplification in various test and measurement setups.
Q & A
- What is the supply voltage range of the INA237AIDGSR?
The INA237AIDGSR operates from a supply voltage range of 2.7 V to 5.5 V.
- What is the resolution of the ADC in the INA237AIDGSR?
The INA237AIDGSR features a high-resolution 16-bit delta-sigma ADC.
- What is the common-mode voltage range supported by the INA237AIDGSR?
The device supports a common-mode voltage range from –0.3 V to +85 V.
- What are the key applications of the INA237AIDGSR?
The INA237AIDGSR is used in DC/DC converters, power inverters, industrial battery packs, PoE systems, telecom equipment, enterprise servers, data acquisition systems, medical devices, industrial automation, and test and measurement equipment.
- How does the INA237AIDGSR handle temperature measurements?
The INA237AIDGSR includes an integrated temperature sensor with an accuracy of ±1°C at 25°C, useful for monitoring both die and system ambient temperature.
- What are the programmable conversion times and averaging options for the INA237AIDGSR?
The device allows for programmable ADC conversion times from 50 µs to 4.12 ms and sample averaging from 1x to 1024x.
- How does the INA237AIDGSR handle alert responses?
The INA237AIDGSR features a fast alert response time of 75 µs and includes a multipurpose ALERT output pin for reporting diagnostics and conversion completion.
- What is the input bias current of the INA237AIDGSR?
The input bias current of the INA237AIDGSR is 2.5 nA (maximum).
- What are the advantages of the zero-drift architecture in the INA237AIDGSR?
The zero-drift architecture minimizes voltage offset and drift over time and temperature, ensuring high accuracy and stability in measurements.
- What package type is the INA237AIDGSR available in?
The INA237AIDGSR is housed in a 10-pin VSSOP package.
