Overview
The OPA378 and OPA2378 operational amplifiers from Texas Instruments represent a new generation of Zerø-Drift, microPOWER™ amplifiers. These devices are designed for low-noise, high-precision applications and are optimized for low-voltage, single-supply operation. The OPA378AIDBVR is a specific package variant of the OPA378 series, offered in a SOT23-5 package. These amplifiers are known for their low input offset voltage, high gain-bandwidth product, and excellent power-supply rejection ratio (PSRR), making them suitable for a wide range of analog signal processing tasks.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VS) | 2.2 | 5.5 | V | |
| Input Offset Voltage (VOS) | 20 | 50 | μV | |
| Input Offset Voltage Drift (dVOS/dT) | 0.1 | 0.25 | μV/°C | |
| Input Bias Current (IB) | ±150 | ±550 | pA | |
| Gain-Bandwidth Product (GBW) | 900 | kHz | ||
| Slew Rate (SR) | 0.4 | V/μs | ||
| Settling Time 0.1% (tS) | 7 | μs | ||
| Output Short-Circuit Current (ISC) | ±30 | mA | ||
| Operating Temperature Range | –40 | +125 | °C | |
| Quiescent Current (IQ) | 125 | 150 | μA |
Key Features
- Low Noise: 0.4μVPP noise from 0.1Hz to 10Hz, and no 1/f (flicker) noise.
- High Precision: Low input offset voltage and drift, ensuring high accuracy over temperature.
- MicroPOWER Operation: Low quiescent current of 125μA to 150μA per amplifier.
- Rail-to-Rail Output: Output voltage swing within 10mV of the supply rails.
- High Common-Mode Rejection Ratio (CMRR): Up to 112dB, ensuring minimal common-mode noise.
- High Power-Supply Rejection Ratio (PSRR): Up to 1.5μV/V, allowing operation with unregulated power supplies.
- Internal Input Low-Pass Filter: Reduces the amplifier's response to EMI.
Applications
- Analog-to-Digital Converters (ADCs): Driving ADCs without degradation of differential linearity.
- Medical Devices: High-precision amplification in medical equipment.
- Aerospace and Defense: Reliable operation in harsh environments.
- Industrial Automation: Precision signal conditioning in industrial control systems.
- Portable Electronics: Low-power operation suitable for battery-powered devices.
Q & A
- What is the typical input offset voltage of the OPA378?
The typical input offset voltage of the OPA378 is 50μV.
- What is the gain-bandwidth product of the OPA378?
The gain-bandwidth product of the OPA378 is 900kHz.
- What is the slew rate of the OPA378?
The slew rate of the OPA378 is 0.4V/μs.
- What is the operating temperature range of the OPA378?
The operating temperature range of the OPA378 is –40°C to +125°C.
- Can the OPA378 operate with unregulated power supplies?
Yes, the OPA378 can operate with unregulated power supplies due to its high PSRR.
- What is the common-mode rejection ratio (CMRR) of the OPA378?
The CMRR of the OPA378 is up to 112dB.
- How does the OPA378 protect against input over-voltage conditions?
The OPA378 can tolerate momentary input voltages greater than the power supplies if the input current is limited to 10mA, typically using an input resistor.
- What is the quiescent current of the OPA378?
The quiescent current of the OPA378 is 125μA to 150μA per amplifier.
- Can the OPA378 be used in single-supply configurations?
Yes, the OPA378 can be used in single-supply configurations from +2.2V to +5.5V.
- What is the output short-circuit current of the OPA378?
The output short-circuit current of the OPA378 is ±30mA.
