Features
- 1.7nV/√Hz input voltage noise at 1kHz
- 1kHz THD+N typical 0.00018% at 2VP-P VOUT
- Harmonic Distortion -76dBc, -70dBc, fo = 1MHz
- 61MHz -3dB bandwidth
- 630µV maximum offset voltage
- 3µA input bias current
- 100dB typical CMRR
- 3V to 5.5V single supply voltage range
- Rail-to-rail output
- Ground sensing
- Enable pin (not available in the 8 Ld SOIC package option)
- Pb-free (RoHS compliant)
Description
The ISL28291 is a tiny, dual, ultra-low noise, ultra-low distortion operational amplifier. It is fully specified to operate down to +3V single supply. This amplifier has outputs that swing rail-to-rail and an input common mode voltage that extends to ground (ground sensing). The device is unity gain stable with an input referred voltage noise of 1.7nV/√Hz. Both parts feature 0.00018% THD+N at 1kHz. The ISL28291 is available in the 8 Ld SOIC, 10 Ld 1.8mm x 1.4mm UTQFN and 10 Ld MSOP packages. All devices are guaranteed over -40 °C to +125 °C.
Parameters
| Attributes | Value |
|---|---|
| Channels (#) | 2 |
| Temp. Range (°C) | -40 to +125°C |
| Bandwidth (MHz) | 61 |
| Gain Min | 1 |
| Offset Voltage (Max) (mV) | 0.63 |
| IBIAS (nA) | 3000 |
| IOUT (A) | 0.13 |
| CMRR (dB) | 100 |
| PSRR (db) | 80 |
| Rail-to-Rail Input | -Vs |
| Rail-to-Rail Output | Yes |
| IS per Amp (mA) | 2.6 |
| Noise VN (nV/√Hz) | 1.7 |
| Single Supply Voltage Range (V) | 3 - 5.5 |
| Slew Rate (V/µs) | 17 |
| VOUT (V) | 4.97 |
| VS (Min) (V) | 3 |
| VS (Max) (V) | 5.5 |
| 2nd Harmonic (dB) | -76 |
| 3rd Harmonic (dB) | -70 |
| AVOL (dB) | 98 |
| Topology [Rail 1] | VFA |
| Enable | Yes |
| Output Headroom (V) | 5 |
| Distortion Conditions | 2Vpp, 1MHz |
| Qualification Level | Standard |
| Simulation Model Available | iSim |
Application Block Diagrams
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Additional Applications
- Low noise signal processing
- Low noise microphones/preamplifiers
- ADC buffers
- DAC output amplifiers
- Digital scales
- Strain gauges/sensor amplifiers
- Radio systems
- Portable equipment
- Infrared detectors