Texas Instruments INA128UA/2K5 +BOM
The Texas Instruments INA128UA/2K5 is a precision instrumentation amplifier. It features a low offset voltage (in the range of several tens of microvolts) and low drift characteristics, ensuring the precise amplification of small signals. With a high common-mode rejection ratio (exceeding 120 dB), it can effectively filter out interference. It has a relatively wide bandwidth, making it suitable for the amplification of high-frequency signals. It has low power consumption, making it suitable for battery-powered scenarios. The gain can be flexibly configured through an external resistor. It supports single-supply operation and has a rail-to-rail output. It is widely used in fields such as medical electrocardiogram detection, industrial sensing, and automotive parameter monitoring, providing a reliable solution for the processing of weak signals.
Texas Instruments INA128UA/2K5's Features
- High Precision and Low Drift
- Low Offset Voltage: It has a very low input offset voltage, typically in the range of a few tens of microvolts (μV). This ensures accurate amplification of small input signals as it minimizes the error introduced at the input stage. For example, in applications where the input signal is on the order of millivolts, a low offset voltage helps in maintaining the integrity of the signal being measured.
- Low Drift: The offset voltage drift over temperature is also quite low. This is crucial in applications where the operating temperature may vary, such as in industrial control systems or automotive electronics. It helps in maintaining consistent performance over a wide temperature range, reducing the need for frequent calibration.
- High Common-Mode Rejection Ratio (CMRR)
- The INA128UA/2K5 offers a high CMRR, usually in the range of 120 dB or more. This high CMRR enables the amplifier to effectively reject common-mode signals (signals that are present on both input terminals) while amplifying the differential signal (the difference between the two input signals). In noisy environments, such as in industrial settings where there may be electrical interference, this feature helps in extracting the desired signal from the noise.
- Wide Bandwidth
- It has a relatively wide bandwidth, which allows it to amplify signals with a wide range of frequencies. This makes it suitable for applications that require the amplification of high-frequency signals, such as in data acquisition systems or medical instrumentation where signals may have components in the kilohertz or even megahertz range.
- Low Power Consumption
- The device consumes very little power, making it suitable for battery-powered applications. In portable devices like handheld medical monitors or remote sensors, low power consumption is essential to extend the battery life. The INA128UA/2K5 can operate with a relatively low supply current, which helps in conserving power.
- Flexible Gain Configuration
- The gain of the INA128UA/2K5 can be easily configured using an external resistor. This provides flexibility in setting the amplification factor according to the specific requirements of the application. Whether it's a low-gain application for measuring large signals or a high-gain application for amplifying very small signals, the user can adjust the gain by simply changing the value of the external resistor.
- Single-Supply Operation
- It can operate from a single power supply, which simplifies the power supply design in many applications. This is particularly useful in systems where a dual-supply voltage is not available or where a more compact power supply solution is desired. The single-supply operation also reduces the complexity and cost of the overall system.
- Rail-to-Rail Output
- The amplifier has a rail-to-rail output capability, which means it can swing the output voltage very close to the positive and negative supply rails. This allows for a larger output voltage range, maximizing the dynamic range of the amplifier. In applications where a large output signal is required, such as in driving analog-to-digital converters (ADCs), the rail-to-rail output feature is highly beneficial.
Texas Instruments INA128UA/2K5's Applications
- Medical Instrumentation
- Electrocardiogram (ECG) and Electroencephalogram (EEG) Devices: In these devices, very small bioelectric signals need to be amplified accurately. The INA128UA/2K5's low offset voltage, high CMRR, and wide bandwidth are ideal for extracting weak signals from the body, such as the electrical activity of the heart in an ECG or the brain in an EEG. It helps in rejecting common-mode noise from the environment and other body signals, providing a clean and accurate amplified output for further analysis.
- Blood Pressure Monitors: For both invasive and non-invasive blood pressure measurement systems, the amplifier can be used to amplify the pressure-related electrical signals. The low drift and high precision of the INA128UA/2K5 ensure consistent and accurate readings over time, even with small changes in the input signal due to variations in blood pressure.
- Industrial Sensing and Control
- Strain Gauge Amplification: Strain gauges are used to measure mechanical stress, force, or weight in industrial settings. The INA128UA/2K5 can amplify the small differential signals from strain gauges. Its high CMRR helps in rejecting common-mode noise from electrical motors, power supplies, and other industrial equipment, while the flexible gain configuration allows for easy adaptation to different strain gauge sensitivities.
- Thermocouple Amplification: Thermocouples generate very small voltage signals proportional to temperature differences. The INA128UA/2K5 can amplify these signals accurately. Its low offset voltage and low drift characteristics are crucial for maintaining temperature measurement accuracy over a wide temperature range, which is important in industrial processes such as furnace temperature control, chemical reactions, and manufacturing lines.
- Data Acquisition Systems
- Bridge Circuit Amplification: In data acquisition systems that use bridge circuits (such as Wheatstone bridges) for measuring physical quantities like pressure, strain, or resistance changes, the INA128UA/2K5 can be used to amplify the small differential output signals. The amplifier's ability to handle high common-mode voltages and its wide bandwidth enable it to capture and amplify signals accurately, even in high-speed data acquisition scenarios.
- Sensor Interface Amplification: It can act as an interface between various sensors (e.g., pressure sensors, accelerometers) and the analog-to-digital converter (ADC) in a data acquisition system. The rail-to-rail output of the INA128UA/2K5 maximizes the dynamic range of the signal being sent to the ADC, ensuring accurate digitization of the sensor data.
- Automotive Electronics
- Engine Parameter Monitoring: In automotive engines, sensors are used to measure parameters such as intake manifold pressure, oil pressure, and coolant temperature. The INA128UA/2K5 can amplify the signals from these sensors. Its low power consumption is beneficial for automotive applications where power management is crucial, and its ability to operate in harsh environments (due to its robust design and temperature stability) makes it suitable for engine compartment applications.
- Battery Management Systems: For monitoring the voltage and current of automotive batteries, the amplifier can be used to amplify the small signals from the battery sensors. The high precision and low drift of the INA128UA/2K5 ensure accurate battery state-of-charge and state-of-health measurements, which are important for maintaining the performance and longevity of the battery.
- Test and Measurement Equipment
- Oscilloscope Probes: In oscilloscopes, the INA128UA/2K5 can be used in the probe circuits to amplify the input signals. Its wide bandwidth allows for accurate reproduction of high-frequency signals, and its high CMRR helps in reducing noise interference, providing a clear and accurate waveform display on the oscilloscope.
Multimeter Amplification: For measuring small voltages, currents, or resistances in multimeters, the amplifier can enhance the sensitivity and accuracy of the measurements. The flexible gain configuration of the INA128UA/2K5 enables the multimeter to be adjusted for different measurement ranges, providing versatility in various test and measurement applications.
Texas Instruments INA128UA/2K5's Attributes
| Number of channels | 1 | Vs (max) (V) | 36 |
| Vs (min) (V) | 4.5 | Input offset (±) (max) (µV) | 50 |
| Voltage gain (min) (V/V) | 1 | Voltage gain (max) (V/V) | 10000 |
| Noise at 1 kHz (typ) (nV√Hz) | 8 | Features | Current Feedback, Overvoltage protection |
| CMRR (min) (dB) | 120 | Input offset drift (±) (max) (V/°C) | 0.0000005 |
| Input bias current (±) (max) (nA) | 5 | Iq (typ) (mA) | 0.7 |
| Bandwidth at min gain (typ) (MHz) | 1.3 | Gain error (±) (max) (%) | 0.5 |
| Operating temperature range (°C) | -40 to 125 | Rating | Catalog |
| Type | Resistor | Gain nonlinearity (±) (max) (%) | 0.004 |
| Output swing headroom (to negative supply) (typ) (V) | 0.8 | Output swing headroom (to positive supply) (typ) (V) | -0.9 |
| Input common mode headroom (to negative supply) (typ) (V) | 1.7 | Input common mode headroom (to positive supply) (typ) (V) | -1.4 |
| Noise at 0.1 Hz to 10 Hz (typ) (µVPP) | 0.2 |
Texas Instruments INA128UA/2K5's Datasheet
Texas Instruments INA128UA/2K5's Category-Amplifiers/Comparators
Amplifiers and comparators play different roles in electronic circuits. The purpose of an amplifier is to linearly amplify the input signal, striving for accurate and stable output in a closed-loop feedback circuit to ensure that the signal is amplified without distortion within a specific linear range. On the other hand, a comparator focuses on determining whether the input voltage is higher or lower than the reference voltage, and its output has only two logic level states. It is commonly used in scenarios such as analog-to-digital conversion and waveform generation. There are many differences between the two. Comparators do not have internal compensation capacitors, resulting in a wider bandwidth. Their outputs are mostly in an open-collector structure, which can flexibly adapt to different logic levels. Amplifiers, however, mainly use push-pull outputs and rely on negative feedback to maintain linear output. In terms of speed, comparators respond quickly. Due to issues such as saturation recovery and propagation delay, the speed of amplifiers is limited when they are used for comparison. However, in certain situations, an amplifier can be used as a comparator. In scenarios that require low-speed and high-precision comparison, new rail-to-rail amplifiers perform excellently due to their characteristics such as low offset. In multi-channel designs, idle amplifier channels can replace comparators, saving cost and space.
The INA128UA/2K5 from Texas Instruments is a high-performance instrumentation amplifier. It has a high common-mode rejection ratio and is suitable for the extraction and amplification of weak signals. Although it is mainly used as an amplifier, in some application scenarios that do not have high requirements for speed but need high-precision comparison, its excellent DC accuracy and low noise characteristics make it possible, through reasonable configuration, to attempt to assume the function of a comparator. This provides engineers with more flexibility and possibilities in circuit design, helping to achieve a more optimized system solution.
INA128UA/2K5 vs INA125UA
| Part number | |
|
|---|---|---|
| Manufacturer | Ti (Texas Instruments) | Texas Instruments |
| Package | SOIC (D)-8 | SOIC (D)-16 |
| Description | Instrumentation Amplifier 1 Circuit 8-SOIC Single instrumentation | |
| Stock | 20668 | 5035 |
| Number of channels | 1 | 1 |
| Vs (max) (V) | 36 | 36 |
| Vs (min) (V) | 4.5 | 2.7 |
| Input offset (±) (max) (µV) | 50 | 250 |
| Voltage gain (min) (V/V) | 1 | 4 |
| Voltage gain (max) (V/V) | 10000 | 10000 |
| Noise at 1 kHz (typ) (nV√Hz) | 8 | 38 |
| Features | Current Feedback, Overvoltage protection | Overvoltage protection |
| CMRR (min) (dB) | 120 | 100 |
| Input offset drift (±) (max) (V/°C) | 0.0000005 | 0.000002 |
| Input bias current (±) (max) (nA) | 5 | 25 |
| Iq (typ) (mA) | 0.7 | 0.46 |
| Bandwidth at min gain (typ) (MHz) | 1.3 | 0.15 |
| Gain error (±) (max) (%) | 0.5 | 0.5 |
| Operating temperature range (°C) | -40 to 125 | -40 to 85 |
| Rating | Catalog | Catalog |
| Manufacturer Type | Resistor | Resistor |
| Gain nonlinearity (±) (max) (%) | 0.004 | 0.004 |
| Output swing headroom (to negative supply) (typ) (V) | 0.8 | 0.4 |
| Output swing headroom (to positive supply) (typ) (V) | -0.9 | -0.9 |
| Input common mode headroom (to negative supply) (typ) (V) | 1.7 | 4.3 |
| Input common mode headroom (to positive supply) (typ) (V) | -1.4 | -4.8 |
| Noise at 0.1 Hz to 10 Hz (typ) (µVPP) | 0.2 | 0.8 |
Wishlist (0 Items) 