| Architecture | FET / CMOS Input, Voltage FB |
| Number of channels (#) | 1 |
| Total supply voltage (Min) (+5V=5, +/-5V=10) | 8 |
| Total supply voltage (Max) (+5V=5, +/-5V=10) | 12 |
| GBW (Typ) (MHz) | 1600 |
| BW @ Acl (MHz) | 350 |
| Acl, min spec gain (V/V) | 7 |
| Slew rate (Typ) (V/us) | 700 |
| Vn at flatband (Typ) (nV/rtHz) | 4.8 |
| Vn at 1 kHz (Typ) (nV/rtHz) | 7 |
| Iq per channel (Typ) (mA) | 14 |
| Vos (offset voltage @ 25 C) (Max) (mV) | 1.8 |
| Rail-to-rail | No |
| Features | Decompensated |
| Rating | Catalog |
| Operating temperature range (C) | -40 to 85 |
| CMRR (Typ) (dB) | 89 |
| Input bias current (Max) (pA) | 20 |
| Offset drift (Typ) (uV/C) | 2 |
| Output current (Typ) (mA) | 70 |
| 2nd harmonic (dBc) | 74 |
| 3rd harmonic (dBc) | 106 |
| Frequency of harmonic distortion measurement (MHz) | 5 |
- High Gain Bandwidth Product: 1.6 GHz
- High Bandwidth 275 MHz (G = 10)
- Slew Rate 700 V/μs (G = 10, 1-V Step)
- Available in High Grade With Improved DC
Specifications - Operating Temperature Range: –40°C to 85°C
- Low-Input Offset Voltage: ±250 μV
- Low-Input Bias Current: 2 pA
- Low-Input Voltage Noise: 4.8 nV/√Hz
- High-Output Current: 70 mA
- Fast Overdrive Recovery
The OPA657 device combines a high-gain bandwidth, low-distortion, voltage-feedback operational amplifier with a low-voltage noise JFET-input stage to offer a very high dynamic range amplifier for high-precision ADC (analog-to-digital converter) driving or wideband transimpedance applications. Photodiode applications see improved noise and bandwidth using this decompensated, high-gain bandwidth amplifier.
Very low level signals can be significantly amplified in a single OPA657 gain stage with exceptional bandwidth and accuracy. Having a high 1.6-GHz gain bandwidth product gives greater than 10-MHz signal bandwidths up to gains of 160 V/V (44 dB). The very low input bias current and capacitance supports this performance even for relatively high source impedances.
Broadband photodetector applications benefit from the low-voltage noise JFET inputs for the OPA657. The JFET input contributes virtually no current noise while for broadband applications, a low voltage noise is also required. The low 4.8 nV/√Hz input voltage noise provides exceptional input sensitivity for higher bandwidth applications. The example shown below gives a total equivalent input noise current of 1.8 pA/√Hz over a 10-MHz bandwidth.
