Overview
The OPA656, produced by Texas Instruments, is a high-performance, wideband, unity-gain stable, voltage-feedback operational amplifier. It features a low-noise junction gate field-effect transistor (JFET) input stage, making it an ultra-high dynamic-range amplifier suitable for transimpedance applications and high-speed data acquisition front-ends. The OPA656 is designed to offer exceptional precision in both optical and test and measurement applications, thanks to its extremely low DC errors and ultra-low input voltage noise.
Key Specifications
| Parameter | Minimum | Typical | Maximum | Unit |
|---|---|---|---|---|
| Unity-Gain Bandwidth | - | 550 | - | MHz |
| Gain-Bandwidth Product | - | 230 | - | MHz |
| Large-Signal Bandwidth (2VPP) | - | 150 | - | MHz |
| Input Offset Voltage | ±0.1 | ±0.6 | ±0.9 | mV |
| Input Offset Voltage Drift | ±2 | ±6 | ±6 | μV/°C |
| Input Bias Current | ±2 | ±20 | ±1250 | pA |
| Input Voltage Noise | - | 6 | - | nV/√Hz |
| Supply Range | 8 | - | 12 | V |
| Operating Temperature Range | -40 | - | 85 | °C |
Key Features
- Wide bandwidth with a unity-gain bandwidth of 550 MHz and a gain-bandwidth product of 230 MHz.
- High precision with an input offset voltage of ±0.6 mV and an input offset voltage drift of ±6 μV/°C.
- Ultra-low input voltage noise of 6 nV/√Hz.
- Low input bias current of 2 pA.
- Low distortion with HD2 and HD3 at 5 MHz of –80 dBc and –100 dBc, respectively.
- High input impedance and low input voltage noise, making it suitable for transimpedance applications.
- ESD protection diodes on all device pins to the power supplies.
- Operates on both single and dual supplies with a maximum power supply voltage of 12 V (±6 V).
Applications
- High-speed data acquisition (DAQ).
- Medical and chemical analyzers.
- Active probes.
- Oscilloscopes.
- Optical communication modules.
- Test and measurement front-ends.
- Optical time-domain reflectometry (OTDR).
- Wideband photodiode amplifiers.
- Sample-and-hold buffers.
- CCD output buffers.
- ADC input buffers.
- Wideband precision amplifiers.
Q & A
- What is the unity-gain bandwidth of the OPA656?
The OPA656 has a unity-gain bandwidth of 550 MHz.
- What is the gain-bandwidth product of the OPA656?
The gain-bandwidth product of the OPA656 is 230 MHz.
- What is the input offset voltage of the OPA656?
The input offset voltage of the OPA656 is ±0.6 mV.
- What is the input bias current of the OPA656?
The input bias current of the OPA656 is 2 pA.
- What is the input voltage noise of the OPA656?
The input voltage noise of the OPA656 is 6 nV/√Hz.
- What is the operating temperature range of the OPA656?
The OPA656 operates over the industrial temperature range of –40°C to +85°C.
- Can the OPA656 be used in high-speed data acquisition applications?
- Does the OPA656 have ESD protection?
- What are some common applications of the OPA656?
The OPA656 is commonly used in applications such as medical and chemical analyzers, active probes, oscilloscopes, optical communication modules, and test and measurement front-ends.
- Can the OPA656 operate on both single and dual supplies?
