CD27 provides low-level signal, excellent low noise and high-precision amplification performance. The products are widely used in stable integrators, precision summation amplifiers, precision voltage threshold detectors, comparators and professional audio circuits, such as magnetic heads and microphone preamplifiers. Offset voltage as low as 26μV. Drift is 0.2μV /°C, so the device is an ideal choice for precision instrument applications.Low noise (en=3.5nv/√Hz at 10Hz), 1/f noise turning frequency (2.7hz) and high gain (1800V/MV) can accurately amplify the low-level signal with high gain.8MHz gain bandwidth product and 2.8 V/µs slew rate can achieve excellent dynamic accuracy in high-speed data acquisition system.Using the bias current elimination circuit, CD27 can achieve a low input bias current of ± 10na. The output stage has good load driving ability.±10 V guaranteed swing (600 Ω load) and low output distortion make the CD27 an excellent choice for professional audio applications. Power supply rejection ratio (PSRR) and common mode rejection ratio (CMRR)both exceed 120dB. With these features and 0.2 μ V long term drift per month,the circuit design can easily reach the high performance level. The product provides more design flexibility in a wide range of temperature environments from - 40 ℃ to + 125 ℃ and all power supply modes supported by the product.