| Architecture | Voltage FB |
| Number of channels (#) | 1 |
| Total supply voltage (Min) (+5V=5, +/-5V=10) | 2.7 |
| Total supply voltage (Max) (+5V=5, +/-5V=10) | 16.5 |
| GBW (Typ) (MHz) | 95 |
| BW @ Acl (MHz) | 95 |
| Acl, min spec gain (V/V) | 1 |
| Slew rate (Typ) (V/us) | 35 |
| Vn at flatband (Typ) (nV/rtHz) | 12.5 |
| Vn at 1 kHz (Typ) (nV/rtHz) | 12.5 |
| Iq per channel (Typ) (mA) | 0.8 |
| Vos (offset voltage @ 25 C) (Max) (mV) | 2.5 |
| Rail-to-rail | In, Out |
| Rating | Catalog |
| Operating temperature range (C) | -40 to 85 |
| CMRR (Typ) (dB) | 107 |
| Input bias current (Max) (pA) | 800000 |
| Offset drift (Typ) (uV/C) | 7 |
| Output current (Typ) (mA) | 30 |
| 2nd harmonic (dBc) | 69 |
| 3rd harmonic (dBc) | 76 |
| Frequency of harmonic distortion measurement (MHz) | 1 |
- Very Low Quiescent Current: 750 μA (at 5 V)
- Rail-to-Rail Input and Output:
- Common-Mode Input Voltage Extends
400 mV Beyond the Rails - Output Swings Within 150 mV From the Rails
- Common-Mode Input Voltage Extends
- Wide –3-dB Bandwidth at 5 V:
- 90 MHz at Gain = +1, 40 MHz at Gain = +2
- High Slew Rate: 35 V/μs
- Fast Settling Time (2-V Step):
- 78 ns to 0.1%
- 150 ns to 0.01%
- Low Distortion at Gain = +2, VO = 2-VPP, 5 V:
- –91 dBc at 100 kHz, –67 dBc at 1 MHz
- Input Offset Voltage: 2.5 mV (Max at +25°C)
- Output Current > 30 mA (10-Ω Load, 5 V)
- Low Voltage Noise of 12.5 nV/√Hz
- Supply Voltages: +2.7 V, 3 V, +5 V, ±5 V, +15 V
- Packages: SOT23, MSOP, and SOIC
- APPLICATIONS
- Portable/Battery-Powered Applications
- High Channel Count Systems
- ADC Buffer
- Active Filters
- Current Sensing
All other trademarks are the property of their respective owners.
Fabricated using the BiCom-II process, the THS4281 is a low-power, rail-to-rail input and output, voltage-feedback operational amplifier 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. Consuming only 750 μA with a unity gain bandwidth of 90 MHz and a high 35-V/μs slew rate, the THS4281 allows portable or other power-sensitive applications to realize high performance with minimal power. To ensure long battery life in portable applications, the quiescent current is trimmed to be less than 900 μA at +25°C, and 1 mA from ?40°C to +85°C.
The THS4281 is a true single-supply amplifier with a specified common-mode input range of 400 mV beyond the rails. This allows for high-side current sensing applications without phase reversal concerns. Its output swings to within 40 mV from the rails with 10-kΩ loads, and 150 mV from the rails with 1-kΩ loads.
The THS4281 has a good 0.1% settling time of 78 ns, and 0.01% settling time of 150 ns. The low THD of ?87 dBc at 100 kHz, coupled with a maximum offset voltage of less than 2.5 mV, makes the THS4281 a good match for high-resolution ADCs sampling less than 2 MSPS.
The THS4281 is offered in a space-saving SOT23-5 package, a small MSOP-8 package, and the industry standard SOIC-8 package.
