GXSC analog-to-digital converter replaces ADS1274 for modal analysis application

Modal analysis is the process of collecting structural vibration signals through devices such as acceleration sensors, velocity sensors, displacement sensors, etc., converting them into digital signals through ADC, and extracting inherent structural characteristic parameters through modal recognition algorithms; The accuracy of modal analysis is highly dependent on the quality of vibration signal acquisition, and vibration signals in industrial sites and experimental environments often exhibit weak, wideband, and multimodal superposition characteristics, while being susceptible to electromagnetic interference.

The GXSC‘s four channel 144ksps 24 bit analog-to-digital converter can replace ADS1274 with PIN TO PIN through advanced Δ - ∑ architecture design and excellent performance indicators, fully matching the signal acquisition requirements of modal analysis.

The GXSC analog-to-digital converter has a 24 bit ultra-high resolution and is capable of finely quantifying weak electrical signals in modal analysis signals. By using a high-order multi bit Delta sigma modulator on the noise, the in band noise is shaped and filtered out through an on-chip digital extraction filter, resulting in very low in band noise power. In addition, it integrates four synchronous sampling channels, which can simultaneously collect the output signals of multiple sensors, fully meeting the signal acquisition requirements of modal analysis.

GXSC can choose from two types of on-chip digital filters: high bandwidth FIR filter, with an effective bandwidth of 90.6% of the Nyquist bandwidth and an in band ripple of less than ± 0.005dB; low latency SINC filter, which can generate stable data output within 6 cycles and has better noise performance. In addition, the chip also has stable temperature characteristics, suitable for industrial applications in high temperature ranges. Its characteristics are as follows:

8-channel synchronous sampling, data rate up to 144kSps

High bandwidth FIR filters and low latency SINC filters are optional

Low power consumption: HS mode: 34.0mW/channel;

HR mode: 20.8mW/channel;

LP mode: 10.9mW/channel;

LS mode: 2.7mW/channel;

Rail to rail input common mode level

Common mode rejection ratio: 116dB

Analog power supply 5V; digital power supply 1.8V

IO power supply: 1.8V~3.3V

SPI or frame synchronization interface, supporting daisy chain mode

ESD level: HBM ± 2kV, CDM ± 2kV; Latch up ± 600mA

• Operating temperature range: -40 ° C to+85 ° C