Overview
The OPA177GS/2K5G4 is a precision bipolar operational amplifier produced by Texas Instruments. This device is renowned for its very low offset voltage and drift, making it an excellent choice for a wide range of precision instrumentation applications. The OPA177 features laser-trimmed offset and drift, which virtually eliminate the need for costly external trimming. It offers high performance and low cost, making it a superior alternative to chopper-stabilized amplifiers. The low quiescent current and low noise characteristics of the OPA177 help maintain maximum signal integrity and reduce warm-up drift and errors due to thermoelectric effects in input interconnections.
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| Input Offset Voltage (VOS) | ±10 | ±25 | ±40 | µV |
| Input Offset Voltage Drift (dVOS/dT) | ±0.1 | ±0.3 | ±1.2 | µV/°C |
| Open-Loop Gain (AOL) | 134 | 141 | - | dB |
| Common-Mode Rejection Ratio (CMRR) | 115 | 140 | - | dB |
| Supply Voltage (VS) | 6 | - | 36 | V |
| Quiescent Current (IQ) | 1.3 | - | 2.5 | mA |
| Input Bias Current | - | - | ±2 nA | - |
| Closed-Loop Bandwidth (BWCL) | 0.4 | 0.6 | - | MHz |
| Slew Rate | 0.1 | 0.3 | - | V/µs |
| Output Voltage Swing | ±12 | - | ±14 | V |
Key Features
- Low offset voltage: up to 25 µV (max)
- Low offset voltage drift: up to 0.3 µV/°C (max)
- High open-loop gain: 134 dB (min)
- Low quiescent current: 1.3 mA (typ)
- Low input bias current: ±2 nA (max)
- Wide supply voltage range: 6 V to 36 V
- Unity-gain stable, easy to use and free from oscillations
- Laser-trimmed offset and drift for high precision
- Internal input bias current cancellation
- Available in 8-pin plastic DIP and SO-8 surface-mount packages
Applications
- Analog input modules
- Data acquisition (DAQ)
- Battery test
- Lab and field instrumentation
- Temperature transmitters
Q & A
- What is the maximum input offset voltage of the OPA177GS/2K5G4?
The maximum input offset voltage is ±25 µV for the F grade and ±60 µV for the G grade.
- What is the input offset voltage drift of the OPA177GS/2K5G4?
The input offset voltage drift is up to 0.3 µV/°C for the F grade and up to 1.2 µV/°C for the G grade.
- What is the open-loop gain of the OPA177GS/2K5G4?
The open-loop gain is a minimum of 134 dB for the F grade and 126 dB for the G grade.
- What is the supply voltage range for the OPA177GS/2K5G4?
The supply voltage range is from 6 V to 36 V, which can be single or dual supply.
- What are the typical applications of the OPA177GS/2K5G4?
Typical applications include analog input modules, data acquisition (DAQ), battery test, lab and field instrumentation, and temperature transmitters.
- How does the OPA177GS/2K5G4 handle input bias current?
The OPA177GS/2K5G4 has internal input bias current cancellation, which reduces the need for external bias current cancellation resistors.
- What are the packaging options for the OPA177GS/2K5G4?
The device is available in 8-pin plastic DIP and SO-8 surface-mount packages).
- What is the quiescent current of the OPA177GS/2K5G4?
The quiescent current is typically 1.3 mA and can go up to 2.5 mA over the operating temperature range).
- How does the OPA177GS/2K5G4 perform in terms of noise?
The OPA177GS/2K5G4 has optimized noise performance, particularly suitable for circuit impedance ranges of 2 kΩ to 50 kΩ. It also offers low input voltage noise and input bias current noise).
- What are some tips for achieving the highest performance with the OPA177GS/2K5G4?
To achieve the highest performance, optimize circuit layout and mechanical conditions. Keep connections to the input pins close together, locate heat sources away from critical input circuitry, and shield the op amp and input circuitry from air currents).
