Logging-While-Drilling (LWD) systems need to accomplish high-precision formation parameter acquisition under high-temperature, high-pressure and high-vibration environments. As the core of the signal chain in the Analog Front End (AFE), the ADC chip converts analog signals output by sensors (such as resistivity, natural gamma, acoustic waves, etc.) into digital signals for processing by DSP or FPGA.
As a 210℃ high-temperature, 8-channel, 16-bit simultaneous sampling ADC, the ZT6283H features a sampling rate of 200 kSPS, a true bipolar input range of ±10V/±5V, 1 MΩ input impedance and a second-order anti-aliasing filter. It can directly match the output types of various downhole sensors, reducing the design complexity of external conditioning circuits. Its simultaneous sampling architecture supports multi-channel synchronous sampling, avoiding phase delay between channels, which is suitable for applications such as high-precision formation boundary detection.
Current industry pain points include: ordinary industrial-grade ADCs cannot withstand operating environments above 200℃; crosstalk between channels and asynchronous sampling in multi-channel systems introduce measurement errors; offset drift and noise degradation of ADCs at high temperatures. By integrating an input buffer, a low-drift reference source and a digital oversampling filter, the ZT6283H maintains a signal-to-noise ratio (SNR) of 86 dB (without oversampling) to 95 dB (64× oversampling) in high-temperature environments, effectively alleviating the above problems.
Qingdao ZITN has accumulated years of technical expertise in the field of ultra-high-temperature electronics, and its products have been verified in multiple national-level Logging-While-Drilling projects. As a representative high-temperature ADC chip of the company, the ZT6283H demonstrates in-depth understanding of harsh downhole environments and strong engineering adaptability.