Battery conversion solution based on GXSC multi-channel analog-to-digital converter GX1258 and low-noise amplifier GX8138, replacing ADS1258/AD8138

In the process of battery production, battery formation plays a decisive role in the performance and consistency of the battery. During the formation stage, it is necessary to accurately monitor and control the voltage, current, and other parameters of the battery to achieve the best charging and discharging effect. This places extremely high demands on the front-end data acquisition system, which needs to have high precision, low noise, multi-channel synchronous acquisition, and other characteristics to meet the overall performance of the battery pack.

The combination of GXSC multi-channel analog-to-digital converter GX1258 for voltage/current monitoring of battery formation and low noise amplifier GX8138 for signal conditioning can provide a reliable and efficient solution for battery formation. In addition, GX1258 and GX8138 can be PIN TO PIN compatible to replace ADS1258 and AD8138, helping the GXSC replacement process and improving the quality and efficiency of battery production.

GX1258 is a 16 channel (multiplexed) synchronous sampling low-noise 24 bit analog-to-digital converter with an accuracy of ± 0.0015%. It can meet the collection of multi-channel battery voltage with microvolt level accuracy and support parallel monitoring of multiple batteries in the conversion cabinet. This chip is capable of stably collecting data at a channel scanning rate of 1.8k to 23.7k in channel polling mode. It operates with a unipolar+5V power supply and allows for a digital voltage range of 2.7V-5.25V.

In the signal conditioning process, the GXSC low-noise fully differential amplifier GX8138 supports 300MHz bandwidth, 1000V/μ s slew rate, and 3.5nV/√ Hz noise. It can respond to dynamic battery current changes at high speed, reduce control delay, provide differential signals, and has lower harmonic distortion compared to existing differential amplifiers. GX8138 utilizes internal common mode feedback and external gain feedback to provide good gain and phase matching.

The differential output of GX8138 makes the input of the differential ADC more balanced, achieving the highest ADC performance. GX8138 does not require the use of auxiliary devices to drive high-performance ADCs and retains low-frequency and DC information. Applying voltage to the VOCM pin can adjust the common mode level of the differential output, making it easy to achieve level conversion to drive the input of a single power ADC. Fast overload recovery can ensure sampling accuracy.

GX8138 has excellent distortion performance and is an ideal ADC driver for communication systems, capable of driving 10 bit to 16 bit converters at higher frequencies. The high bandwidth and IP3 characteristics make it suitable for use as a gain module in intermediate frequency and baseband signal chains. The excellent misalignment and dynamic performance make this device very suitable for various signal processing and data acquisition applications.