| Number of channels (#) | 2 |
| Total supply voltage (Max) (+5V=5, +/-5V=10) | 5.5 |
| Total supply voltage (Min) (+5V=5, +/-5V=10) | 1.7 |
| Vos (offset voltage @ 25 C) (Max) (mV) | 0.045 |
| GBW (Typ) (MHz) | 1 |
| Features | e-Trim? |
| Slew rate (Typ) (V/us) | 1 |
| Rail-to-rail | In, Out |
| Offset drift (Typ) (uV/C) | 1 |
| Iq per channel (Typ) (mA) | 0.024 |
| Vn at 1 kHz (Typ) (nV/rtHz) | 60 |
| CMRR (Typ) (dB) | 121 |
| Rating | Catalog |
| Operating temperature range (C) | -40 to 125 |
| Input bias current (Max) (pA) | 0.8 |
| Output current (Typ) (mA) | 60 |
| Architecture | CMOS |
| THD + N @ 1 kHz (Typ) (%) | 0.002 |
- Low IQ: 24 μA
- Gain bandwidth product: 1 MHz
- Low input bias current: 10 fA
- Low offset voltage: ±45 μV (maximum)
- Low drift: ±1.2 μV/°C
- Low supply voltage operation: 1.7 V to 5.5 V
- Input common mode range ±100 mV beyond rail
- Fast slew rate: 1 V/μs
- High load capacitance drive
- High output current drive: 60 mA
- Rail-to-rail output
- EMI/RFI filtered inputs
- Small package options: SC-70, DSBGA
The OPA391 and OPA2391 ( OPAx391) feature a unique combination of high bandwidth (1?MHz) along with very-low quiescent current (24?μA) in high-precision amplifiers. These features combined with rail-to-rail input and output make these devices an exceptional choice in high-gain, low-power applications. Ultra-low input bias current of 10?fA, only 45?μV of offset (maximum), and 1.2?μV/°C of drift over temperature help maintain high precision in ratiometric and amperometric sensor front ends that have demanding low-power requirements.
The OPAx391 use Texas Instrument?s proprietary e?trim? operational amplifier technology, enabling a unique combination of ultra-low offset and low input offset drift without the need for any input switching or auto-zero techniques. The CMOS-based technology platform also features a modern, robust output stage design that is tolerant of high output capacitance, alleviating stability problems that are common in typical low-power amplifiers.
