Overview
The THS4281DBVR is a very low-power, high-speed, rail-to-rail input and output voltage-feedback operational amplifier produced by Texas Instruments. This amplifier is designed to operate over a wide power-supply range, from 2.7 V to 15 V for single supply and ±1.35 V to ±7.5 V for dual supply. It is fabricated using the BiCom-II process, which enables it to consume minimal power while delivering high performance.
With a quiescent current of 750 μA at 5 V, the THS4281DBVR is ideal for power-sensitive applications, including portable and battery-powered devices. It features a unity gain bandwidth of 90 MHz and a high slew rate of 35 V/μs, making it suitable for high-speed and high-resolution applications.
Key Specifications
| Parameter | Typical Value | Unit |
|---|---|---|
| Quiescent Current | 750 μA (at 5 V) | μA |
| Unity Gain Bandwidth | 90 MHz (at Gain = +1) | MHz |
| Slew Rate | 35 V/μs | V/μs |
| Settling Time (2-V Step) | 78 ns to 0.1%, 150 ns to 0.01% | ns |
| Input Offset Voltage | 2.5 mV (Max at +25°C) | mV |
| Output Current | 30 mA (10-Ω Load, 5 V) | mA |
| Common-Mode Input Range | 400 mV beyond the rails | mV |
| Supply Voltages | 2.7 V to 15 V (single supply), ±1.35 V to ±7.5 V (dual supply) | V |
| Packages | SOT23-5, MSOP-8, SOIC | - |
Key Features
- Rail-to-Rail Input and Output: The amplifier can operate with input and output voltages that extend to within 400 mV beyond the supply rails.
- Low Quiescent Current: Consumes only 750 μA at 5 V, making it suitable for power-sensitive applications.
- High Speed: Features a unity gain bandwidth of 90 MHz and a slew rate of 35 V/μs.
- Fast Settling Time: Settles to 0.1% in 78 ns and to 0.01% in 150 ns for a 2-V step.
- Low Distortion: Offers low total harmonic distortion (THD) of –91 dBc at 100 kHz and –67 dBc at 1 MHz.
- Low Voltage Noise: Has a low voltage noise of 12.5 nV/√Hz.
Applications
- Portable/Battery-Powered Applications: Ideal for devices requiring low power consumption to extend battery life.
- High Channel Count Systems: Suitable for systems that require multiple channels with high performance and low power consumption.
- ADC Buffering: Often used as a buffer for high-resolution analog-to-digital converters (ADCs) due to its low distortion and high speed.
- High-Side Current Sensing: The amplifier's ability to operate with input voltages beyond the rails makes it suitable for high-side current sensing applications.
Q & A
- What is the typical quiescent current of the THS4281DBVR at 5 V?
The typical quiescent current is 750 μA at 5 V.
- What is the unity gain bandwidth of the THS4281DBVR?
The unity gain bandwidth is 90 MHz.
- What is the slew rate of the THS4281DBVR?
The slew rate is 35 V/μs.
- What is the settling time for a 2-V step to 0.1% and 0.01% accuracy?
The settling time is 78 ns to 0.1% and 150 ns to 0.01%.
- What is the maximum input offset voltage at +25°C?
The maximum input offset voltage is 2.5 mV at +25°C.
- What are the typical supply voltages for the THS4281DBVR?
The supply voltages range from 2.7 V to 15 V for single supply and ±1.35 V to ±7.5 V for dual supply.
- In what packages is the THS4281DBVR available?
The THS4281DBVR is available in SOT23-5, MSOP-8, and SOIC packages.
- What are some common applications for the THS4281DBVR?
Common applications include portable/battery-powered devices, high channel count systems, ADC buffering, and high-side current sensing.
- What is the common-mode input range of the THS4281DBVR?
The common-mode input range extends 400 mV beyond the supply rails.
- What is the output current capability of the THS4281DBVR with a 10-Ω load at 5 V?
The output current capability is greater than 30 mA with a 10-Ω load at 5 V.
