Overview
The OPA342NA/3KG4 is part of the OPA342 series of rail-to-rail CMOS operational amplifiers designed by Texas Instruments. These amplifiers are optimized for low-cost, low-power, and miniature applications. They are particularly suited for single-supply operations with a voltage range from 2.7V to 5.5V and offer excellent dynamic response with a low quiescent current of 150µA typical per amplifier. The OPA342 series includes single, dual, and quad versions, providing design flexibility with identical specifications across all versions.
Key Specifications
| Parameter | Condition | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| Input Offset Voltage (VOS) | VCM = VS/2 | ±1 | ±6 | ±6 | mV |
| Power Supply Rejection Ratio (PSRR) | VS = 2.7V to 5.5V, VCM < (V+) -1.8V | 30 | 200 | 250 | µV/V |
| Input Bias Current (IB) | ±0.2 | nA | |||
| Common-Mode Rejection Ratio (CMRR) | VS = +2.7V, –0.3V < VCM < 3V | 62 | 74 | dB | |
| Open-Loop Voltage Gain (AOL) | RL = 100kΩ, 10mV < VO < (V+) – 10mV | 104 | 124 | dB | |
| Gain-Bandwidth Product (GBW) | 1 | MHz | |||
| Slew Rate (SR) | 1 | V/µs | |||
| Quiescent Current (IQ) | IO = 0A | 150 | 250 | µA | |
| Operating Temperature Range | –40 | +85 | °C |
Key Features
- Rail-to-Rail Input and Output: The OPA342 series offers rail-to-rail input and output, extending the input common-mode voltage range 300mV beyond the supply rails.
- Low Quiescent Current: Typical quiescent current of 150µA per amplifier, making it suitable for low-power applications.
- Single Supply Capability: Operates on a single supply from 2.7V to 5.5V.
- High-Speed Operation: Features a gain-bandwidth product of 1MHz and a slew rate of 1V/µs.
- Low Cost and Miniature Packages: Available in various packages including SOT23-5, MSOP-8, TSSOP-14, and others, making it ideal for space-limited applications.
- High Dynamic Response: Excellent dynamic performance with low total harmonic distortion plus noise (THD + N) of 0.006%.
Applications
- Communications: Suitable for various communication systems due to its high-speed and low-noise characteristics.
- PCMCIA Cards: Ideal for use in PCMCIA cards where low power and small size are critical.
- Data Acquisition: Used in data acquisition systems, especially when interfacing with analog-to-digital converters (ADCs).
- Process Control: Applicable in process control systems where precision and stability are required.
- Audio Processing: Suitable for audio applications due to its low noise and high dynamic range.
- Active Filters: Can be used in active filter designs where high accuracy and stability are needed.
- Test Equipment: Used in various test and measurement equipment due to its high performance and reliability.
- Consumer Electronics: Commonly used in consumer electronics for signal amplification and conditioning.
Q & A
- What is the typical quiescent current of the OPA342NA/3KG4?
The typical quiescent current is 150µA per amplifier.
- What is the operating voltage range of the OPA342 series?
The operating voltage range is from 2.7V to 5.5V.
- What are the key features of the rail-to-rail input and output of the OPA342 series?
The rail-to-rail input and output extend the input common-mode voltage range 300mV beyond the supply rails, and the output can swing within 1mV of the supply rails.
- What is the gain-bandwidth product of the OPA342 series?
The gain-bandwidth product is 1MHz.
- What is the slew rate of the OPA342 series?
The slew rate is 1V/µs.
- What are some common applications of the OPA342 series?
Common applications include communications, PCMCIA cards, data acquisition, process control, audio processing, active filters, test equipment, and consumer electronics.
- What are the available package options for the OPA342NA/3KG4?
Available packages include SOT23-5, MSOP-8, TSSOP-14, and others.
- How does the OPA342 series handle input voltages beyond the rails?
If the input voltage goes more than 0.3V below the negative power supply rail, special precautions such as a Schottky diode clamp circuit are required to prevent the op amp from locking up.
- What is the thermal resistance of the SOT23-5 package for the OPA342NA/3KG4?
The thermal resistance for the SOT23-5 package is 200°C/W.
- Is the OPA342NA/3KG4 suitable for high-speed applications?
Yes, it is suitable for high-speed applications with a gain-bandwidth product of 1MHz and a slew rate of 1V/µs.
