Overview
The INA849DR, produced by Texas Instruments, is an ultra-low noise instrumentation amplifier designed for maximum accuracy in high-resolution systems. It operates over a wide range of single-supply or dual-supply voltages, making it versatile for various applications. The device features super-beta input transistors, which significantly reduce input bias current compared to other instrumentation amplifiers. The state-of-the-art manufacturing process ensures exceptionally low voltage noise, input offset voltage, and offset voltage drift. This amplifier is ideal for applications requiring high precision and wide bandwidth, such as directly driving high-resolution analog-to-digital converters (ADCs).
Key Specifications
| Parameter | Typical | Maximum | Unit |
|---|---|---|---|
| Input Voltage Noise | 1 nV/√Hz | nV/√Hz | |
| Offset Voltage | 35 µV | µV | |
| Offset Voltage Drift | 0.4 µV/°C | µV/°C | |
| Input Bias Current | 20 nA | nA | |
| Gain Drift (G = 1) | 5 ppm/°C | ppm/°C | |
| Bandwidth (G = 1) | 28 MHz | MHz | |
| Bandwidth (G = 100) | 8 MHz | MHz | |
| Slew Rate | 35 V/µs | V/µs | |
| Common-Mode Rejection Ratio (CMRR) | 92 dB (G = 1) | dB | |
| Supply Voltage (Single Supply) | 8 V to 36 V | V | |
| Supply Voltage (Dual Supply) | ±4 V to ±18 V | V | |
| Operating Temperature Range | –40°C to +125°C | °C | |
| Packages | 8-pin SOIC, 8-pin VSSOP |
Key Features
- Ultra-Low Noise: 1 nV/√Hz input voltage noise, making it suitable for high-resolution systems.
- Precision Super-Beta Input Performance: Low offset voltage (35 µV maximum) and low offset voltage drift (0.4 µV/°C maximum).
- Low Input Bias Current: 20 nA maximum, significantly lower than competitors due to super-beta input transistors.
- Wide Bandwidth: 28 MHz at G = 1 and 8 MHz at G = 100, with a fast 0.4-µs settling time (0.01%).
- High Common-Mode Rejection Ratio (CMRR): 92 dB (G = 1), ensuring high accuracy in differential signal amplification.
- Adjustable Gain: Gain can be set from 1 to 10,000 using a single external resistor (RG).
- Wide Supply Range: Operates on single supply (8 V to 36 V) or dual supply (±4 V to ±18 V).
- High Slew Rate: 35 V/µs, suitable for fast-moving signals.
Applications
- High-Resolution Systems: Ideal for applications requiring precise signal amplification, such as medical devices, test and measurement equipment, and industrial control systems.
- Analog-to-Digital Converters (ADCs): Directly drives high-resolution ADCs with fast settling times and low noise.
- Automotive and Industrial Automation: Suitable for use in automotive and industrial environments due to its wide operating temperature range and robust specifications.
- Audio and Video Equipment: Used in professional audio and video equipment where low noise and high fidelity are critical.
Q & A
- What is the typical input voltage noise of the INA849DR?
The typical input voltage noise of the INA849DR is 1 nV/√Hz.
- What is the maximum offset voltage of the INA849DR?
The maximum offset voltage of the INA849DR is 35 µV.
- How is the gain of the INA849DR adjusted?
The gain of the INA849DR is adjusted using a single external resistor (RG) connected between the RG pins.
- What is the bandwidth of the INA849DR at a gain of 1 and 100?
The bandwidth of the INA849DR is 28 MHz at G = 1 and 8 MHz at G = 100.
- What is the common-mode rejection ratio (CMRR) of the INA849DR?
The CMRR of the INA849DR is 92 dB at G = 1.
- What is the operating temperature range of the INA849DR?
The operating temperature range of the INA849DR is –40°C to +125°C.
- What are the available packages for the INA849DR?
The INA849DR is available in 8-pin SOIC and 8-pin VSSOP packages.
- What is the slew rate of the INA849DR?
The slew rate of the INA849DR is 35 V/µs.
- Can the INA849DR be used in automotive applications?
Yes, the INA849DR is suitable for automotive applications due to its robust specifications and wide operating temperature range.
- How does the INA849DR handle fast-moving signals?
The INA849DR handles fast-moving signals with its wide bandwidth and fast settling time (0.4 µs at 0.01%).
