Overview
The OPA656N/250G4, produced by Texas Instruments, is a wideband, unity-gain stable, voltage-feedback operational amplifier featuring a low-noise junction gate field-effect transistor (JFET) input stage. This amplifier is designed to offer an ultra-high dynamic-range performance, making it ideal for transimpedance applications and high-speed data acquisition front-ends. The OPA656 combines high input impedance, low input voltage noise, and low distortion, ensuring excellent precision in both optical and test and measurement applications.
Key Specifications
| Parameter | Test Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Unity-Gain Bandwidth | G = +1 V/V, VO = 200 mVPP, RF = 0 Ω | - | 550 | - | MHz |
| Gain-Bandwidth Product | G ≥ 10 V/V | - | 230 | - | MHz |
| Large-Signal Bandwidth | VO = 2 VPP | - | 150 | - | MHz |
| Input Offset Voltage | VCM = 0 V | ±0.1 | ±0.6 | ±0.9 | mV |
| Input Offset Voltage Drift | VCM = 0 V | ±2 | ±6 | ±6 | µV/°C |
| Input Voltage Noise | - | - | 6 | - | nV/√Hz |
| Input Bias Current | VCM = 0 V | ±2 | ±20 | ±1250 | pA |
| Supply Range | - | ±5 | ±6 | - | V |
| Operating Temperature Range | - | -40 | 85 | - | °C |
Key Features
- Wide Bandwidth: Unity-gain bandwidth of 550 MHz, gain-bandwidth product of 230 MHz, and large-signal bandwidth of 150 MHz.
- High Precision: Low input offset voltage (±0.6 mV), low input offset voltage drift (±6 µV/°C), and high common-mode rejection ratio (84 dB to 95 dB).
- Low Noise: Ultra-low input voltage noise of 6 nV/√Hz.
- Low Distortion: High linearity with HD2 and HD3 at 5 MHz of –80 dBc and –100 dBc, respectively.
- High Input Impedance: Suitable for applications requiring high input impedance, such as optical front-ends and test and measurement systems.
- ESD Protection: Internal ESD protection diodes to the power supplies.
- Operating Range: Specified to operate over the industrial temperature range of –40°C to +85°C.
Applications
- High-Speed Data Acquisition (DAQ): Ideal for high-speed digitizer front-ends.
- Medical and Chemical Analyzers: Suitable for medical and scientific instrumentation.
- Active Probes: Used in active probes due to its high bandwidth and low distortion.
- Oscilloscopes: Applicable in oscilloscope front-ends.
- Optical Communication Modules: Excellent for optical test and communication equipment.
- Test and Measurement Front-Ends: Widely used in test and measurement systems.
- Optical Time-Domain Reflectometry (OTDR): Suitable for OTDR applications.
Q & A
- What is the unity-gain bandwidth of the OPA656N/250G4?
The unity-gain bandwidth of the OPA656N/250G4 is 550 MHz.
- What is the gain-bandwidth product of the OPA656N/250G4?
The gain-bandwidth product of the OPA656N/250G4 is 230 MHz.
- What is the input voltage noise of the OPA656N/250G4?
The input voltage noise of the OPA656N/250G4 is 6 nV/√Hz.
- What is the input bias current of the OPA656N/250G4?
The input bias current of the OPA656N/250G4 is typically ±20 pA, with a maximum of ±1250 pA over the industrial temperature range.
- What are the typical applications of the OPA656N/250G4?
The OPA656N/250G4 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 OPA656N/250G4?
The OPA656N/250G4 operates over the industrial temperature range of –40°C to +85°C.
- Does the OPA656N/250G4 have ESD protection?
- What is the supply range for the OPA656N/250G4?
- What is the common-mode rejection ratio (CMRR) of the OPA656N/250G4?
- Can the OPA656N/250G4 be used in single and dual supply configurations?
