Overview
The OPA656U/2K5, 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 excellent choice for applications requiring high input impedance and low noise. The amplifier is designed for transimpedance applications and high-speed data acquisition front-ends, offering ultra-high dynamic range and good precision in both optical and test and measurement applications. It operates over an industrial temperature range of –40°C to +85°C and can be powered by a dual supply of ±5 V to ±6 V.
Key Specifications
| Parameter | Minimum | Typical | Maximum | Unit |
|---|---|---|---|---|
| Gain-Bandwidth Product | - | 230 | - | MHz |
| Unity-Gain Bandwidth | - | 550 | - | MHz |
| Large-Signal Bandwidth (2VPP) | - | 150 | - | MHz |
| Input Offset Voltage | - | 600 | - | μV |
| Input Offset Voltage Drift | - | 6 | - | μV/°C |
| Input Voltage Noise | - | 6 | - | nV/√Hz |
| Input Bias Current | - | 2 | - | pA |
| Supply Range | ±5 | - | ±6 | V |
| Output Voltage Swing (No Load) | ±3.7 | ±3.9 | - | V |
| Output Current (Sourcing) | 45 | 70 | - | mA |
| Output Current (Sinking) | -70 | -50 | - | mA |
| Common-Mode Rejection Ratio | 83 | 95 | - | dB |
Key Features
- Wide Bandwidth: Gain-bandwidth product of 230MHz, unity-gain bandwidth of 550MHz, and large-signal bandwidth of 150MHz.
- High Precision: Low input offset voltage (600μV maximum), low input offset voltage drift (6μV/°C maximum), and ultra-low input voltage noise (6nV/√Hz).
- Low Distortion: High linearity with HD2 and HD3 at 5MHz of –80dBc and –100dBc respectively.
- Low Input Bias Current: 2pA, making it suitable for high-impedance sources.
- High Input Impedance: Differential input impedance of 10^10 Ω || 2.6 pF and common-mode input impedance of 10^12 Ω || 0.4 pF.
- ESD Protection: Internal ESD protection diodes to the power supplies.
- Operating Temperature Range: –40°C to +85°C.
Applications
- High-Speed Data Acquisition (DAQ): Ideal for high-speed digitizer front-ends.
- Medical and Chemical Analyzers: Suitable for precision measurement applications.
- Active Probes: Used in test and measurement equipment.
- Oscilloscopes: Enhances the performance of oscilloscope front-ends.
- Optical Communication Modules: Excellent for transimpedance applications in optical communication.
- Test and Measurement Front-ends: High precision and low noise make it ideal for various test and measurement applications.
- Optical Time-Domain Reflectometry (OTDR): Used in OTDR systems for high-bandwidth and low-noise requirements.
Q & A
- What is the gain-bandwidth product of the OPA656U/2K5?
The gain-bandwidth product of the OPA656U/2K5 is 230MHz.
- What is the unity-gain bandwidth of the OPA656U/2K5?
The unity-gain bandwidth of the OPA656U/2K5 is 550MHz.
- What is the input voltage noise of the OPA656U/2K5?
The input voltage noise of the OPA656U/2K5 is 6nV/√Hz.
- What is the input bias current of the OPA656U/2K5?
The input bias current of the OPA656U/2K5 is 2pA.
- What is the operating temperature range of the OPA656U/2K5?
The operating temperature range of the OPA656U/2K5 is –40°C to +85°C.
- What are the typical applications of the OPA656U/2K5?
The OPA656U/2K5 is typically used in high-speed data acquisition, medical and chemical analyzers, active probes, oscilloscopes, optical communication modules, test and measurement front-ends, and optical time-domain reflectometry (OTDR).
- What is the supply range for the OPA656U/2K5?
The supply range for the OPA656U/2K5 is ±5 V to ±6 V.
- Does the OPA656U/2K5 have ESD protection?
Yes, the OPA656U/2K5 has internal ESD protection diodes to the power supplies.
- What is the common-mode rejection ratio (CMRR) of the OPA656U/2K5?
The common-mode rejection ratio (CMRR) of the OPA656U/2K5 is 83 dB to 95 dB.
- Can the OPA656U/2K5 be used in single-supply configurations?
Yes, the OPA656U/2K5 can be operated on both single and dual supplies.
