Overview
The INA238AQDGSRQ1, produced by Texas Instruments, is an ultra-precise digital power monitor designed specifically for current-sensing applications. This device features a 16-bit delta-sigma ADC and is capable of measuring current, bus voltage, temperature, and power with high accuracy. It supports a wide common-mode range from –0.3 V to +85 V and can handle full-scale differential inputs of ±163.84 mV or ±40.96 mV across a resistive shunt sense element. The INA238AQDGSRQ1 is particularly useful in systems requiring precise measurements without the need for multi-temperature calibration during manufacturing.
Key Specifications
| Parameter | Value |
|---|---|
| ADC Resolution | 16-bit delta-sigma ADC |
| Offset Voltage | ±5 µV (maximum) |
| Offset Drift | ±0.02 µV/°C (maximum) |
| Gain Error | ±0.1% (maximum) |
| Gain Error Drift | ±25 ppm/°C (maximum) |
| Common Mode Rejection | 140 dB (minimum) |
| Power Monitoring Accuracy | 0.7% full scale, –40°C to +125°C (maximum) |
| Alert Response Time | 75 µs |
| Common Mode Range | –0.3 V to +85 V |
| Bus Voltage Sense Input | 0 V to 85 V |
| 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) |
| Supply Voltage Range | 2.7 V to 5.5 V |
| Operational Current | 640 µA (typical) |
| Shutdown Current | 5 µA (maximum) |
| I²C Interface Speed | 2.94 MHz |
| I²C Addresses | 16 pin-selectable addresses |
Key Features
- High-resolution 16-bit delta-sigma ADC for precise current, voltage, and power measurements.
- Low offset voltage and gain drift, enabling use in precise systems without multi-temperature calibration.
- Wide common-mode range from –0.3 V to +85 V and full-scale differential input ranges of ±163.84 mV or ±40.96 mV.
- Fast alert response time of 75 µs.
- Integrated temperature sensor with ±1°C accuracy at 25°C.
- Programmable ADC conversion times from 50 µs to 4.12 ms and sample averaging from 1x to 1024x.
- Low input bias current of 2.5 nA, allowing for larger current-sense resistors.
- High-speed I²C interface with 16 pin-selectable addresses.
- Operates from a 2.7-V to 5.5-V supply with low operational and shutdown currents.
Applications
The INA238AQDGSRQ1 is suitable for a variety of applications requiring precise current, voltage, and power monitoring. These include:
- Automotive systems, particularly those requiring AEC-Q100 compliance.
- Industrial power monitoring and control systems.
- Server and data center power management.
- Railway and aerospace applications where high precision and reliability are critical.
- Renewable energy systems, such as solar and wind power monitoring.
Q & A
- What is the primary function of the INA238AQDGSRQ1?
The INA238AQDGSRQ1 is an ultra-precise digital power monitor designed for current-sensing applications, measuring current, bus voltage, temperature, and power. - What is the resolution of the ADC in the INA238AQDGSRQ1?
The INA238AQDGSRQ1 features a 16-bit delta-sigma ADC. - What is the common mode range of the INA238AQDGSRQ1?
The common mode range is from –0.3 V to +85 V. - How accurate is the temperature sensor in the INA238AQDGSRQ1?
The integrated temperature sensor is ±1°C accurate at 25°C. - What is the alert response time of the INA238AQDGSRQ1?
The alert response time is 75 µs. - What is the supply voltage range for the INA238AQDGSRQ1?
The device operates from a 2.7-V to 5.5-V supply. - What is the typical operational current of the INA238AQDGSRQ1?
The typical operational current is 640 µA. - Does the INA238AQDGSRQ1 support programmable ADC conversion times?
Yes, the ADC conversion times are programmable from 50 µs to 4.12 ms, and sample averaging is available from 1x to 1024x. - How many pin-selectable I²C addresses does the INA238AQDGSRQ1 support?
The device supports 16 pin-selectable I²C addresses. - What are some typical applications for the INA238AQDGSRQ1?
Typical applications include automotive systems, industrial power monitoring, server and data center power management, railway and aerospace, and renewable energy systems.
