Overview
The OPA656U, 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 amplifier is designed to offer extremely low DC errors, which are crucial for precision in optical applications and test and measurement systems. Its ultra-low input voltage noise of 6nV/√Hz and high input impedance make it an excellent choice for wideband transimpedance amplifiers in optical test and communication equipment, as well as in medical and scientific instrumentation.
Key Specifications
| Parameter | Minimum | Typical | Maximum | Unit |
|---|---|---|---|---|
| Gain-Bandwidth Product | - | 230 MHz | - | MHz |
| Unity-Gain Bandwidth | - | 550 MHz | - | MHz |
| Large-Signal Bandwidth (2VPP) | - | 150 MHz | - | MHz |
| Input Offset Voltage | - | - | 600 μV | μV |
| Input Offset Voltage Drift | - | - | 6 μV/°C | μV/°C |
| Input Voltage Noise | - | 6 nV/√Hz | - | nV/√Hz |
| Input Bias Current | - | 2 pA | - | pA |
| Supply Range | 8 V | - | 12 V | V |
| Operating Temperature Range | -40 °C | - | 85 °C | °C |
| Package Type | - | SOIC (8-pin), SOT-23 (5-pin) | - | - |
Key Features
- Wide Bandwidth: Gain-bandwidth product of 230 MHz, unity-gain bandwidth of 550 MHz, and large-signal bandwidth of 150 MHz.
- High Precision: Low input offset voltage (600 μV maximum), low input offset voltage drift (6 μV/°C maximum), and ultra-low input voltage noise (6 nV/√Hz).
- Low Distortion: High second and third harmonic distortion (HD2, HD3) at 5 MHz: –80 dBc, –100 dBc.
- Low Input Bias Current: 2 pA, ensuring minimal current draw from the input signal.
- High Input Impedance: Suitable for applications requiring high input impedance, such as optical front-end applications and test and measurement systems.
- ESD Protection: Internal ESD protection diodes to the power supplies, providing moderate protection against input overdrive voltages.
Applications
- High-Speed Data Acquisition (DAQ): Ideal for front-ends in high-speed data acquisition systems due to its wide bandwidth and low distortion.
- Medical and Chemical Analyzers: Suitable for medical and chemical analysis equipment requiring high precision and low noise.
- Active Probes: Used in active probes for test and measurement applications.
- Oscilloscopes: Applicable in oscilloscope front-ends for high-speed signal processing.
- Optical Communication Modules: Excellent for optical communication modules due to its high dynamic range and low noise characteristics.
- Test and Measurement Front-ends: Suitable for various test and measurement applications requiring high bandwidth and precision.
- Optical Time-Domain Reflectometry (OTDR): Used in OTDR systems for precise signal processing.
Q & A
- What is the gain-bandwidth product of the OPA656U?
The gain-bandwidth product of the OPA656U is 230 MHz.
- What is the unity-gain bandwidth of the OPA656U?
The unity-gain bandwidth of the OPA656U is 550 MHz.
- What is the input offset voltage of the OPA656U?
The input offset voltage of the OPA656U is up to 600 μV.
- What is the input voltage noise of the OPA656U?
The input voltage noise of the OPA656U is 6 nV/√Hz.
- What is the supply voltage range for the OPA656U?
The supply voltage range for the OPA656U is from 8 V to 12 V (±4 V to ±6 V).
- What are the typical applications of the OPA656U?
The OPA656U 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 operating temperature range of the OPA656U?
The operating temperature range of the OPA656U is from -40 °C to 85 °C.
- Does the OPA656U have ESD protection?
Yes, the OPA656U has internal ESD protection diodes to the power supplies.[
- What are the package options for the OPA656U?
The OPA656U is available in SOIC (8-pin) and SOT-23 (5-pin) packages.[
- What is the slew rate of the OPA656U?
The slew rate of the OPA656U is 295 V/μs.[
