GXSC OPA Compatible with OP4177 for Use in Precision Filters

Active precision filters are centered around operational amplifiers and paired with high-precision resistors and capacitors. Through a deep negative feedback architecture, they achieve signal selection and noise suppression within specific frequency bands, enabling precise implementation of various filtering functions such as low-pass, high-pass, band-pass, and band-reject. They are widely used in scenarios requiring signal purification for strain signals, sensor analog signals, physiological electrical signals, and low-speed precision data acquisition.

While general-purpose operational amplifiers suffer from high input offset voltage and high low-frequency noise, the GXSC OPA features exceptional characteristics such as extremely low input offset voltage, ultra-low drift, low input bias current, high open-loop gain, and low input noise. Designed specifically for precision, low-speed, low-frequency, and high-stability analog signal processing applications, it is the ideal component for building precision filters.

The GXSC OPA features extremely low offset voltage and drift, low input bias current, low noise, and low power consumption. The output remains stable when using a capacitive load of 1000 pF or higher, eliminating the need for external compensation. At a supply voltage of 30 V, the supply current per amplifier is less than 500 μA. An integrated 500 Ω series resistor protects the input, allowing the input signal level to exceed the supply voltage by several volts while ensuring no inversion.

Applications for the GXSC OPA include precision diode power measurement, voltage and current level setting, and level detection in optical and wireless transmission systems. Other applications include line-powered portable instruments and control components: signal conditioning for thermocouples, RTDs, strain gauges, and other sensors, as well as precision filters. The GXSC OPA features are as follows:

PIN-TO-PIN replacement for OP4177

 Offset voltage: 50 µV (max)

 Ultra-low offset voltage drift: 0.25 µV/°C (max)

 Low input bias current: 2 nA (max)

 Low noise: 8.4 nV/√Hz (typical)

 Common-mode rejection ratio (CMRR), power supply rejection ratio (PSRR), and AVO: >120 dB (minimum)

Low supply current: 400 µA per amplifier

Dual supply: ±2.5 V to ±12.5 V

Slew rate: 0.72 V/µs

Operating temperature: -40°C to 125°C

Internal protection circuit supports input voltages exceeding the supply voltage

Package: SOIC8/14