Overview
The OPA637AP, produced by Texas Instruments, is a precision, high-speed JFET operational amplifier. It is part of the OPA6x7 series, which includes the OPA627 and OPA637 models. These operational amplifiers offer superior performance in terms of noise, offset voltage, and speed, making them ideal for a wide range of precision and high-speed analog circuitry applications. The OPA637AP is fabricated on a high-speed, dielectrically-isolated, complementary NPN/PNP process and operates over a wide power-supply voltage range of ±4.5V to ±18V. It features laser-trimmed input circuitry for high accuracy and low-noise performance comparable to the best bipolar-input op amps.
Key Specifications
| Parameter | Test Conditions | Min | Max | Unit | |
|---|---|---|---|---|---|
| Offset Voltage (VOS) | Input offset voltage | ±40 | ±100 | ±250 | μV |
| Input Offset Voltage Drift (dVOS/dT) | TA = –25°C to +85°C | ±0.4 | ±0.8 | μV/°C | |
| Power Supply Rejection Ratio (PSRR) | VS = ±4.5V to ±18V | 106 | 116 | 120 | dB |
| Input Bias Current (IB) | TA = 25°C | ±1 | ±5 | pA | |
| Input Offset Current (IOS) | TA = 25°C | ±0.5 | ±5 | pA | |
| Common-Mode Voltage Range (VCM) | TA = –25°C to +85°C | ±10.5 | ±11 | V | |
| Common-Mode Rejection Ratio (CMRR) | –10.5V ≤ VCM ≤ +10.5V | 106 | 116 | dB | |
| Open-Loop Gain (AOL) | VO = ±10 V, RL = 1kΩ | 112 | 120 | dB | |
| Gain-Bandwidth Product (GBW) | Gain = 10V/V | 80 | MHz | ||
| Slew Rate (SR) | 10V step, gain = –4V/V | 100 | 135 | V/μs | |
| Settling Time (tS) | 10V step, gain = –4V/V, to 0.01% | 450 | ns | ||
| Output Voltage (VO) | RL = 1kΩ | ±11.5 | ±12.3 | V | |
| Output Current (ISC) | Short-circuit current | ±35 | ±70/–55 | ±100 | mA |
| Quiescent Current (IQ) | IO = 0mA | 7 | 7.5 | mA |
Key Features
- Very Low Noise: 4.5 nV/√Hz at 10 kHz.
- Fast Settling Time: 450 ns to 0.01% for the OPA637.
- Low Offset Voltage (VOS): 100 µV maximum.
- Low Drift: 0.8 µV/°C maximum.
- Low Input Bias Current (IB): 5 pA maximum.
- Gain Stability: The OPA637 is stable in gains ≥ 5.
- Wide Power-Supply Voltage Range: ±4.5V to ±18V.
- High Frequency Performance: High gain-bandwidth product and slew rate.
Applications
- Precision Instrumentation: High accuracy and low noise make it suitable for precision measurement instruments.
- Fast Data Acquisition: Fast settling time and high bandwidth are ideal for fast data acquisition systems.
- DAC Output Amplifier: Used to amplify the output of digital-to-analog converters.
- Optoelectronics: Suitable for optoelectronic applications requiring low noise and high speed.
- Sonar, Ultrasound: High-speed and low-noise characteristics make it suitable for sonar and ultrasound applications.
- High-Impedance Sensor Amps: Ideal for amplifying signals from high-impedance sensors.
- High-Performance Audio Circuitry: Used in high-performance audio systems requiring low noise and high fidelity.
- Active Filters: Suitable for active filter circuits due to its high bandwidth and low noise.
Q & A
- What is the typical input voltage noise of the OPA637AP?
The typical input voltage noise of the OPA637AP is 4.5 nV/√Hz at 10 kHz.
- What is the settling time of the OPA637AP to 0.01%?
The settling time of the OPA637AP to 0.01% is 450 ns.
- What is the maximum offset voltage of the OPA637AP?
The maximum offset voltage of the OPA637AP is 100 µV.
- What is the input bias current of the OPA637AP?
The input bias current of the OPA637AP is 5 pA maximum.
- In what gain configurations is the OPA637AP stable?
The OPA637AP is stable in gains ≥ 5.
- What is the power-supply voltage range of the OPA637AP?
The power-supply voltage range of the OPA637AP is ±4.5V to ±18V.
- What are the typical packages available for the OPA637AP?
The OPA637AP is available in SOIC-8, PDIP-8, and TO-99 packages.
- What is the common-mode rejection ratio (CMRR) of the OPA637AP?
The common-mode rejection ratio (CMRR) of the OPA637AP is 106 dB to 116 dB.
- What is the slew rate of the OPA637AP?
The slew rate of the OPA637AP is 100 V/μs to 135 V/μs.
- What is the quiescent current of the OPA637AP?
The quiescent current of the OPA637AP is 7 mA to 7.5 mA.
