Overview
The OPA657N/250G4, produced by Texas Instruments, is a 1.6-GHz, low-noise, FET-input operational amplifier. This device combines high gain bandwidth, low distortion, and a voltage-feedback operational amplifier with a low-voltage noise JFET-input stage. It is designed to offer a very high dynamic range, making it suitable for high-precision applications such as analog-to-digital converter (ADC) driving, wideband transimpedance applications, and photodiode amplification.
Key Specifications
| Parameter | Typical | Minimum | Maximum | Unit |
|---|---|---|---|---|
| Gain Bandwidth Product | 1.6 GHz | - | - | GHz |
| Small-Signal Bandwidth (G = 10) | 275 MHz | - | - | MHz |
| Slew Rate (G = 10, 1-V Step) | 700 V/µs | - | - | V/µs |
| Input Offset Voltage | ±0.1 mV | ±0.6 mV | ±0.9 mV | mV |
| Input Bias Current | ±1 pA | ±5 pA | ±1250 pA | pA |
| Input Voltage Noise | 4.8 nV/√Hz | - | - | nV/√Hz |
| Output Current, Sourcing | 70 mA | 48 mA | 50 mA | mA |
| Output Current, Sinking | -70 mA | -48 mA | -50 mA | mA |
| Operating Temperature Range | -40°C to 85°C | - | - | °C |
| Power Supply Voltage | ±5 V | ±4 V | ±6 V | V |
Key Features
- High gain bandwidth product of 1.6 GHz
- High bandwidth of 275 MHz at a gain of 10
- Low input voltage noise of 4.8 nV/√Hz
- Low input bias current of 2 pA
- Fast slew rate of 700 V/µs
- High output current capability of up to 70 mA sourcing and 70 mA sinking
- Wide operating temperature range from -40°C to 85°C
- Fast overdrive recovery
Applications
- Wideband photodiode amplifiers
- ADC input amplifiers
- Test and measurement front ends
- High gain precision amplifiers
- Optical Time Domain Reflectometry (OTDR)
- Wafer scanning equipment
Q & A
- What is the gain bandwidth product of the OPA657?
The gain bandwidth product of the OPA657 is 1.6 GHz.
- What is the typical small-signal bandwidth at a gain of 10?
The typical small-signal bandwidth at a gain of 10 is 275 MHz.
- What is the input voltage noise of the OPA657?
The input voltage noise of the OPA657 is 4.8 nV/√Hz.
- What is the input bias current of the OPA657?
The input bias current of the OPA657 is typically 2 pA.
- What is the slew rate of the OPA657 at a gain of 10 and a 1-V step?
The slew rate of the OPA657 at a gain of 10 and a 1-V step is 700 V/µs.
- What is the maximum output current of the OPA657?
The maximum output current of the OPA657 is up to 70 mA sourcing and 70 mA sinking.
- What is the operating temperature range of the OPA657?
The operating temperature range of the OPA657 is from -40°C to 85°C.
- What are some common applications of the OPA657?
Common applications include wideband photodiode amplifiers, ADC input amplifiers, test and measurement front ends, high gain precision amplifiers, and optical time domain reflectometry (OTDR).
- What is the power supply voltage range for the OPA657?
The power supply voltage range for the OPA657 is ±4 V to ±6 V.
- What packages are available for the OPA657?
The OPA657 is available in SOIC (8) and SOT-23 (5) packages.
