Overview
The INA849DGKR is a precision instrumentation amplifier produced by Texas Instruments. It is designed for high-accuracy applications requiring ultra-low noise and high bandwidth. The device features a current-feedback topology, which enables wide bandwidth at higher gains, making it suitable for very-small, fast-moving signals. The INA849DGKR operates over a wide single-supply or dual-supply range and is optimized for maximum accuracy in high-resolution systems.
Key Specifications
| Parameter | Typical | Minimum | Maximum | Unit |
|---|---|---|---|---|
| Input Voltage Noise | 1 nV/√Hz | - | - | nV/√Hz |
| Offset Voltage | - | -35 µV | - | µV |
| Input Bias Current | - | - | 7.24 nA | nA |
| Common-Mode Rejection Ratio (CMRR) | - | - | 92 dB (G = 1) | dB |
| Bandwidth (G = 1) | - | - | 28 MHz | MHz |
| Bandwidth (G = 100) | - | - | 8 MHz | MHz |
| Settling Time (0.01%, G = 1) | - | - | 0.4 µs | µs |
| Supply Voltage (Single Supply) | - | 8 V | 36 V | V |
| Supply Voltage (Dual Supply) | - | ±4 V | ±18 V | V |
| Operating Temperature | - | -40 °C | 125 °C | °C |
Key Features
- Ultra-Low Noise: 1 nV/√Hz input voltage noise, making it ideal for high-resolution systems.
- Precision Super-Beta Input Performance: Low offset voltage of 35 µV (maximum) and low input bias current.
- High Bandwidth: Up to 28 MHz at a gain of 1 and 8 MHz at a gain of 100.
- Adjustable Gain: Gain can be set from 1 to 10,000 using a single external resistor (RG).
- High CMRR: 92 dB common-mode rejection ratio at a gain of 1.
- Fast Settling Time: 0.4 µs settling time (0.01%) for directly driving high-resolution analog-to-digital converters (ADCs).
Applications
The INA849DGKR is suitable for a variety of high-accuracy applications, including:
- High-Resolution Data Acquisition Systems: Due to its low noise and high bandwidth, it is ideal for precision measurement systems.
- Medical Equipment: For applications requiring precise signal amplification, such as ECG and EEG systems.
- Industrial Automation: In sensors and measurement instruments that require high accuracy and low noise.
- Aerospace and Defense: For critical signal processing applications where precision and reliability are paramount.
Q & A
- What is the typical input voltage noise of the INA849DGKR?
The typical input voltage noise is 1 nV/√Hz. - What is the maximum offset voltage of the INA849DGKR?
The maximum offset voltage is 35 µV. - How is the gain of the INA849DGKR adjusted?
The gain can be adjusted from 1 to 10,000 using a single external resistor (RG). - What is the common-mode rejection ratio (CMRR) of the INA849DGKR at a gain of 1?
The CMRR is 92 dB at a gain of 1. - What is the bandwidth of the INA849DGKR at a gain of 1 and 100?
The bandwidth is up to 28 MHz at a gain of 1 and 8 MHz at a gain of 100. - What is the settling time of the INA849DGKR for a 0.01% accuracy at a gain of 1?
The settling time is 0.4 µs for a 0.01% accuracy at a gain of 1. - What is the operating temperature range of the INA849DGKR?
The operating temperature range is from -40 °C to 125 °C. - What are the typical supply voltage ranges for the INA849DGKR?
The supply voltage ranges are from 8 V to 36 V for single supply and ±4 V to ±18 V for dual supply. - What types of applications is the INA849DGKR suitable for?
The INA849DGKR is suitable for high-resolution data acquisition systems, medical equipment, industrial automation, and aerospace and defense applications. - How does the INA849DGKR handle common-mode signals?
The INA849DGKR has a high CMRR of 92 dB at a gain of 1, effectively rejecting common-mode signals.
