14 bit 80MSPS analog-to-digital converter GX2245/LDO chip GX9195 replaces LTC2245/6/7/8/9/AR9195 for traveling wave ranging solution

Traveling wave technology is based on the collected fault traveling wave signals for calculation and analysis, in order to accurately identify various types of faults and accurately locate them, greatly improving operation and maintenance efficiency. However, the current distribution network has extremely high requirements for the positioning accuracy of traveling wave distance measuring devices. At the same time, facing the complex environment of the distribution network, in order to achieve high-precision fault analysis and positioning, it is necessary to rely on precise and high-speed analog signal chain products.

This article introduces a nationwide industrial grade solution that is independently controllable, high-performance, low-power, and low-cost. The signal sampling analog-to-digital converter can use the GXSC 14 bit 80MSPS analog-to-digital converter GX2245, and the system power supply is stabilized using GXSC‘s ultra-low power low voltage drop linear regulator. GX2245 is a single channel 14 bit 80MSPS/65MSPS/40MSPS/25MSPS/10MSPS analog-to-digital converter using a multi-stage differential pipeline architecture. It can replace ADI‘s LTC2245/6/7/8/9 chips with PIN TO PIN.

The GX2245 is equipped with a high-performance sample and hold circuit and an on-chip reference voltage source, designed specifically for digitizing high bandwidth dynamic range signals, making it ideal for demanding communication applications. At 80MHz sampling, it has a signal-to-noise ratio of 72.8dB and a spurious free dynamic range of 85dB, which can be used for input signals far beyond the Nyquist frequency. The DC specifications include ± 1LSB INL (typical value), ± 0.25LSB DNL (typical value), and no leakage code. The input reference noise is very low, only 0.96LSBRMS.

The GX9195 power regulator chip for this system is an LDO with ultra-low static current (0.8 μ A), 400mA output, and high PSRR (63dB), providing clean voltage for sensitive analog circuits such as ADCs and amplifiers, and low power consumption to extend the battery life of battery powered equipment. GX9195 is equipped with input current limiting, output short circuit protection, overheating protection and other functions to protect the chip from damage under abnormal working conditions. GX9195 operates within a voltage range of 2.0V~5.5V, with output voltages of 3.3V, 3.0V, 2.8V, 1.8V, and 1.2V. It adopts SOT23-3, SOT23-5, and DFN-4 packaging forms, replacing AR9195.