Overview
The OPA349SA/3KG4, part of the OPA349 series from Texas Instruments, is an ultra-low power operational amplifier. This device is designed to provide high performance with minimal power consumption, making it ideal for battery-powered applications. The OPA349 features a rail-to-rail input and output, ensuring a wide dynamic range. It operates with a quiescent current of only 1µA and has a gain-bandwidth product of 70kHz. The amplifier is unity-gain stable and does not require external compensation, simplifying circuit design.
Key Specifications
| Parameter | Condition | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| Supply Voltage Range | 1.8 | 5.5 | V | ||
| Quiescent Current (per amplifier) | IO = 0 | 1 | 2 | µA | |
| Gain-Bandwidth Product | G = +1 | 70 | kHz | ||
| Input Offset Voltage | VS = 5V, VCM = 2.5V | ±2 | ±10 | mV | |
| Input Bias Current | 10 | pA | |||
| Output Drive Current | ±8 | mA | |||
| Common-Mode Voltage Range | (V–) – 0.2 | (V+) + 0.2 | V | ||
| Operating Temperature Range | 0 | +70 | °C |
Key Features
- Ultra-low power consumption: 1µA quiescent current per amplifier.
- High gain-bandwidth product: 70kHz.
- Unity-gain stable, no external compensation required.
- Rail-to-rail input and output, extending 200mV beyond the power-supply rails.
- Low input bias current: 10pA (max).
- Wide supply voltage range: 1.8V to 5.5V.
- High open-loop gain: 90dB.
- Available in miniature packages: SC70, SOT23-5, SOT23-8, and SO-8.
Applications
- Battery packs and power supplies.
- Portable phones, pagers, and cameras.
- Solar-powered systems.
- Smoke, gas, and fire detection systems.
- Remote sensors.
- PCMCIA cards.
- Driving analog-to-digital (A/D) converters.
- Micro-power filters.
Q & A
- What is the quiescent current of the OPA349SA/3KG4?
The quiescent current is 1µA per amplifier.
- What is the gain-bandwidth product of the OPA349SA/3KG4?
The gain-bandwidth product is 70kHz.
- Is the OPA349SA/3KG4 unity-gain stable?
- What is the input bias current of the OPA349SA/3KG4?
The input bias current is 10pA (max).
- What is the supply voltage range for the OPA349SA/3KG4?
The supply voltage range is from 1.8V to 5.5V.
- What are the typical operating temperature ranges for the OPA349SA/3KG4?
The specified operating temperature range is from 0°C to +70°C.
- In what packages is the OPA349SA/3KG4 available?
The OPA349SA/3KG4 is available in SC70, SOT23-5, SOT23-8, and SO-8 packages.
- What are some common applications for the OPA349SA/3KG4?
Common applications include battery packs, portable electronics, solar-powered systems, and remote sensors.
- How does the rail-to-rail input feature benefit the OPA349SA/3KG4?
The rail-to-rail input feature allows the input common-mode voltage range to extend 200mV beyond the power-supply rails, enhancing the dynamic range of the amplifier.
- What is the output drive current of the OPA349SA/3KG4?
The output drive current is ±8mA.
