Overview
The OPA347SA/3K is a microPower, low-cost operational amplifier from Texas Instruments. It is part of the OPA347 series, which includes single, dual, and quad versions. The OPA347SA/3K is specifically the single version packaged in the SC70-5 package. This amplifier is designed for low power consumption and high performance in small form factors, making it ideal for portable and battery-powered applications.
Key Specifications
| Parameter | Condition | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| Input Offset Voltage (VOS) | VS = 5.5V, VCM = (V–) + 0.8V | 2 | 6 | 7 | mV |
| Input Bias Current (Ib) | ±0.5 | ±10 | pA | ||
| Input Offset Current (IOS) | ±0.5 | ±10 | pA | ||
| Differential Input Impedance | 1013 || 3 | Ω || pF | |||
| Common-Mode Input Impedance | 1013 || 6 | Ω || pF | |||
| Input Voltage Noise (f = 0.1Hz to 10Hz) | VCM < (V+) – 1.7V | 12 | µVPP | ||
| Input Voltage Noise Density (f = 1kHz) | 60 | nV/√Hz | |||
| Open-Loop Voltage Gain (AOL) | VS = 5.5V, RL = 100kΩ, 0.015V < VO < 5.485V | 100 | 115 | dB | |
| Bandwidth | 350 | kHz | |||
| Power Supply Range | 2.3 | 5.5 | V | ||
| Quiescent Current (IQ) per Channel | IO = 0 | 20 | 34 | µA | |
| Operating Temperature Range | –55 | 125 | °C | ||
| Thermal Resistance (θJA) - SC70-5 | 250 | °C/W |
Key Features
- Low Power Consumption: Maximum quiescent current of 34µA per channel, making it suitable for battery-powered and portable applications.
- MicroSIZE Packages: Available in SC70-5, SOT23-5, SOT23-8, and other compact packages.
- High Speed/Power Ratio: Bandwidth of 350kHz.
- Rail-to-Rail Input and Output: Input range extends 200mV beyond the rails, and output range is within 5mV of the rails.
- Single Supply Operation: Can operate from a single supply voltage ranging from 2.3V to 5.5V.
- Unity-Gain Stable: Easy to use in various configurations without additional components.
- High Open-Loop Gain: Up to 115dB.
- Low Input Bias Current: Typically ±0.5pA.
- Wide Operating Temperature Range: Specified from –55°C to +125°C.
Applications
- Portable Equipment: Ideal for devices that require low power consumption and compact size.
- Battery-Powered Equipment: Suitable for applications where battery life is a critical factor.
- 2-Wire Transmitters: Used in various sensing and transmission applications.
- Smoke Detectors and CO Detectors: Reliable operation in safety-critical devices.
Q & A
- What is the typical quiescent current of the OPA347SA/3K?
The typical quiescent current is 20µA per channel, with a maximum of 34µA per channel.
- What is the bandwidth of the OPA347SA/3K?
The bandwidth is 350kHz.
- What is the input offset voltage of the OPA347SA/3K?
The input offset voltage is typically 6mV.
- Can the OPA347SA/3K operate on a single supply?
Yes, it can operate on a single supply voltage ranging from 2.3V to 5.5V.
- What is the operating temperature range of the OPA347SA/3K?
The specified operating temperature range is from –55°C to +125°C.
- What are the available packages for the OPA347 series?
The OPA347 series is available in SC70-5, SOT23-5, SOT23-8, SO-8, DIP-8, and other packages.
- How does the OPA347SA/3K handle capacitive loads?
The OPA347 in a unity-gain configuration can directly drive up to 250pF pure capacitive load. Increasing the gain enhances the ability to drive greater capacitive loads.
- What is the common-mode rejection ratio (CMRR) of the OPA347SA/3K?
The CMRR is specified in several ways, but it is generally high, indicating good common-mode rejection.
- Can the OPA347SA/3K be used in safety-critical applications?
Yes, it is used in safety-critical devices such as smoke detectors and CO detectors due to its reliable operation.
- How should the power-supply pins of the OPA347SA/3K be bypassed?
The power-supply pins should be bypassed with 0.01µF ceramic capacitors.
