INA281A3IDBVT vs OPA4202ID
| Part Number |
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| Category | Linear - Amplifiers - Instrumentation, OP Amps, Buffer Amps | Linear - Amplifiers - Instrumentation, OP Amps, Buffer Amps |
| Manufacturer | Texas Instruments | Texas Instruments |
| Description | -4 TO 100-V, 1-MHZCURRENT | IC OPAMP GP 4 CIRCUIT 14SOIC |
| Package | Tube | Tube |
| Series | - | - |
| Operating Temperature | -40°C ~ 125°C (TA) | -40°C ~ 105°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
| Package / Case | SC-74A, SOT-753 | 14-SOIC (0.154\", 3.90mm Width) |
| Supplier Device Package | SOT-23-5 | 14-SOIC |
| Current - Supply | 1.5mA | 580µA (x4 Channels) |
| Output Type | - | - |
| Number of Circuits | 1 | 4 |
| Voltage - Supply, Single/Dual (±) | 2.7V ~ 20V | 4.5V ~ 36V, ±2.25V ~ 18V |
| Current - Output / Channel | - | 35 mA |
| -3db Bandwidth | - | - |
| Amplifier Type | Current Sense | General Purpose |
| Current - Input Bias | 20 µA | 250 pA |
| Voltage - Input Offset | 30 µV | 20 µV |
| Slew Rate | 2.5V/µs | 0.35V/µs |
| Gain Bandwidth Product | 1 MHz | 1 MHz |
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1. What is an instrumentation amplifier and what is it mainly used for?
An instrumentation amplifier is a high-precision amplifier designed to amplify low-level differential signals with high input impedance and high common mode rejection ratio (CMRR), and is commonly used in scenarios such as medical equipment, sensor signal processing, and industrial measurements.
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2. How to choose the right instrumentation amplifier?
The input common-mode voltage range, gain-bandwidth product, noise performance, power consumption, temperature drift, and common-mode rejection ratio (CMRR) should be considered when selecting an instrumentation amplifier to ensure that it meets the accuracy requirements of a particular application.
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3. What is Common Mode Rejection Ratio (CMRR) and why is it important for instrumentation amplifiers?
CMRR indicates an instrumentation amplifier's ability to suppress common mode signals, with higher values being better. A high CMRR is especially important in noisy environments to ensure that the amplifier primarily amplifies differential signals and is not affected by common mode interference.
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4. What is a rail-to-rail operational amplifier and what are its advantages?
Rail-to-rail op amps are capable of extending the output voltage range to the limit of the supply voltage (i.e., the “rail”), allowing them to handle large dynamic range signals even at low supply voltages, making them particularly suitable for low-voltage power supply systems and portable devices.
