Overview
The OPA657NB/250G4, produced by Texas Instruments, is a 1.6-GHz, low-noise, FET-input operational amplifier. This device is designed to offer high gain bandwidth, low distortion, and exceptional dynamic range, making it suitable for high-precision applications such as analog-to-digital converter (ADC) driving and wideband transimpedance amplification. The OPA657 features a JFET-input stage that provides low-voltage noise and minimal current noise, enhancing its performance in broadband photodetector and other high-sensitivity applications.
Key Specifications
| Parameter | Test Conditions | Typical | Minimum | Maximum | Unit |
|---|---|---|---|---|---|
| Gain Bandwidth Product | G > +40 V/V | 1600 MHz | - | - | MHz |
| Small-Signal Bandwidth | G = +10 V/V, VO = 200 mVPP | 275 MHz | - | - | MHz |
| Slew Rate | G = 10, 1-V Step | 700 V/µs | - | - | V/µs |
| Input Offset Voltage | VCM = 0 V | ±0.1 mV | ±0.6 mV | ±0.9 mV | mV |
| Input Bias Current | VCM = 0 V | ±1 pA | ±5 pA | ±1250 pA | pA |
| Input Voltage Noise | - | 4.8 nV/√Hz | - | - | nV/√Hz |
| Output Current | - | 70 mA | 48 mA | 50 mA | mA |
| Operating Temperature Range | - | -40°C to 85°C | - | - | °C |
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
- High slew rate of 700 V/µs
- Fast overdrive recovery
- High output current capability of up to 70 mA
- Operating temperature range from –40°C to 85°C
Applications
- Wideband photodiode amplifiers
- Wafer scanning equipment
- ADC input amplifiers
- Test and measurement front ends
- High gain precision amplifiers
- Optical Time Domain Reflectometry (OTDR)
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 of the OPA657 at a gain of 10?
The typical small-signal bandwidth at a gain of 10 is 275 MHz.
- What is the slew rate of the OPA657?
The slew rate of the OPA657 is 700 V/µs at a gain of 10 with a 1-V step.
- 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 ±1 pA.
- What is the maximum output current of the OPA657?
The maximum output current of the OPA657 is up to 70 mA.
- 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, wafer scanning equipment, ADC input amplifiers, test and measurement front ends, high gain precision amplifiers, and OTDR.
- What package options are available for the OPA657?
The OPA657 is available in SOT-23 (5-pin) and SOIC (8-pin) packages.
- What is the power supply rejection ratio (PSRR) of the OPA657?
The PSRR of the OPA657 is typically 76 dB for positive supply and 62 dB for negative supply.
