The OPA380 family of transimpedance amplifiers provides high-speed (90MHz Gain Bandwidth [GBW]) operation, with extremely high precision, excellent long-term stability, and very low 1/f noise. It is ideally suited for high-speed photodiode applications. The OPA380 features an offset voltage of 25µV, offset drift of 0.1µV/°C, and bias current of 50pA. The OPA380 far exceeds the offset, drift, and noise performance that conventional JFET op amps provide.
The signal bandwidth of a transimpedance amplifier depends largely on the GBW of the amplifier and the parasitic capacitance of the photodiode, as well as the feedback resistor. The 90MHz GBW of the OPA380 enables a transimpedance bandwidth of > 1MHz in most configurations. The OPA380 is ideally suited for fast control loops for power level on an optical fiber.
As a result of the high precision and low-noise characteristics of the OPA380, a dynamic range of 4 to 5 decades can be achieved. For example, this capability allows the measurement of signal currents on the order of 1nA, and up to 100µA in a single I/V conversion stage. In contrast to logarithmic amplifiers, the OPA380 provides very wide bandwidth throughout the full dynamic range. By using an external pull-down resistor to -5V, the output voltage range can be extended to include 0V.
The OPA380 (single) is available in MSOP-8 and SO-8 packages. The OPA2380 (dual) is available in the miniature MSOP-8 package. They are specified from -40°C to +125°C.
Products containing the "OPA380" keyword are: OPA380AID , OPA380AID , OPA380AIDG4 , OPA380AIDG4 , OPA380AIDGK , OPA380AIDGK(AUN) , OPA380AIDGKR , OPA380AIDGKR , OPA380AIDGKRG4 , OPA380AIDGKRG4 , OPA380AIDGKRG4.. , OPA380AIDGKT , OPA380AIDGKTG4 , OPA380AIDGKTG4 , OPA380AIDR , OPA380AIDR , OPA380AIDRG4 , OPA380AIDRG4All trademarks are the property of their respective owners.
| Status | ACTIVE |
| Architecture | Voltage FB |
| Number of channels | 1 |
| Total Supply Voltage | 5.5 |
| BW @ Acl | 90 |
| Acl, min spec gain | 1 |
| Slew Rate | 80 |
| Vn at flatband | 5 |
| Vn at 1 kHz | 150 |
| Iq per channel | 7.5 |
| Vos (offset voltage @ 25 C) | 25 |
| Rail-to-rail | In to V- |
| Features | N/A |
| Rating | Catalog |
| Operating temperature range | -40 to 125 |
| Package Group | SOIC|8 |
| Approx. price | 1.95 | 1ku |
| Package size: mm2:W x L (PKG) | [pf]8SOIC[/pf]: 29 mm2: 6 x 4.9 (SOIC|8) |
| CMRR | 110 |
| Input bias current | 50 |
| Offset drift | 0.03 |
| GBW | 90 |
| Output current | 75 |
| 2nd harmonic | 81 |
| 3rd harmonic | 93 |
| @ MHz | 1 |
| Radiation, TID | |
| Radiation, SEL |