Overview
The THS4281DBVT, produced by Texas Instruments, is a very low-power, high-speed, rail-to-rail input and output voltage-feedback operational amplifier. Fabricated using the BiCom-II process, this amplifier is designed to operate over a wide power-supply range of 2.7-V to 15-V single supply and ±1.35-V to ±7.5-V dual supply. It is particularly suited for power-sensitive applications, such as portable devices, due to its low quiescent current of 750 µA at 5 V and high performance characteristics like a 90 MHz unity gain bandwidth and a 35 V/µs slew rate.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Quiescent Current | 750 µA (at 5 V) | µA |
| Supply Voltage Range | 2.7 V to 15 V (single supply), ±1.35 V to ±7.5 V (dual supply) | V |
| Bandwidth | 90 MHz at Gain = +1, 40 MHz at Gain = +2 | MHz |
| Slew Rate | 35 V/µs | V/µs |
| Settling Time (2-V Step) | 78 ns to 0.1%, 150 ns to 0.01% | ns |
| Common-Mode Input Range | 400 mV beyond the rails | mV |
| Output Voltage Swing | Within 150 mV from the rails with 1-kΩ loads | mV |
| Input Offset Voltage | < 2.5 mV (Max at +25°C) | mV |
| Package | SOT23-5, MSOP-8, SOIC-8 |
Key Features
- Very Low Quiescent Current: 750 µA at 5 V, ensuring long battery life in portable applications.
- Rail-to-Rail Input and Output: Common-mode input voltage extends 400 mV beyond the rails, and output swings within 150 mV from the rails with 1-kΩ loads.
- High Bandwidth and Slew Rate: 90 MHz bandwidth at gain = +1 and 35 V/µs slew rate, enabling high-speed operations.
- Fast Settling Time: 78 ns to 0.1% and 150 ns to 0.01% for a 2-V step, which is crucial for high-resolution ADC applications.
- Low Distortion: Total Harmonic Distortion (THD) of -87 dBc at 100 kHz, making it suitable for high-resolution ADCs.
- Compact Packaging: Available in SOT23-5, MSOP-8, and SOIC-8 packages, offering space-saving solutions.
Applications
- Portable/Battery-Powered Applications: Ideal for devices requiring low power consumption and high performance.
- High Channel Count Systems: Suitable for systems that require multiple channels with minimal power consumption.
- ADC Buffering: Excellent for buffering high-resolution ADCs due to its low distortion and fast settling time.
- Active Filters: Can be used in active filter designs requiring high bandwidth and low power.
- Current Sensing: Appropriate for high-side current sensing applications without phase reversal concerns.
Q & A
- What is the quiescent current of the THS4281DBVT at 5 V?
The quiescent current is 750 µA at 5 V.
- What is the bandwidth of the THS4281DBVT at a gain of +1?
The bandwidth is 90 MHz at a gain of +1.
- What is the slew rate of the THS4281DBVT?
The slew rate is 35 V/µs.
- How does the THS4281DBVT perform in terms of settling time?
The settling time is 78 ns to 0.1% and 150 ns to 0.01% for a 2-V step.
- What is the common-mode input range of the THS4281DBVT?
The common-mode input range extends 400 mV beyond the rails.
- What are the available package options for the THS4281DBVT?
The THS4281DBVT is available in SOT23-5, MSOP-8, and SOIC-8 packages).
- What is the maximum output current of the THS4281DBVT?
The output current is greater than 30 mA with a 10-Ω load at 5 V).
- Is the THS4281DBVT suitable for high-resolution ADC applications?
Yes, it is suitable due to its low distortion and fast settling time).
- What is the typical input offset voltage of the THS4281DBVT?
The typical input offset voltage is less than 2.5 mV at +25°C).
- Can the THS4281DBVT be used in high-side current sensing applications?
Yes, it can be used without phase reversal concerns due to its rail-to-rail input and output capabilities).
