24-bit, 250kSPS single power supply data acquisition system

　　Advantages and features:

　　*24-bit 250kS PS ADC system

　　*Industrial signal level

　　* Single power supply

　　application:

　　*Instrumentation

　　*Programmable logic control and distributed control system

　　*Electronic Test and Measurement

　　*Circuit functions and advantages

　　When sampling industrial-level signals, fast, high-resolution conversion information is necessary. Typically, when the sampling rate reaches 500kSPS, the resolution of the analog-to-digital converter (ADC) can be 14-bit to 18-bit. The circuit shown in Figure 1 is a single-supply system optimized for industrial-level signal sampling , using a 24-bit, 250 kSPS Σ-Δ ADC. Each of the two differential channels or four pseudo-differential channels can Provides 17.2 bits of noise-free code resolution at a sampling rate of 50kS PS .

　　This circuit uses an innovative differential amplifier with built-in laser trimmed resistors to achieve attenuation and level conversion. It uses a precision ADC with low power supply voltage to solve the problem of acquiring and digitally processing standard industrial level signals of ±5V, ±10V and 0V to 10V. . This circuit can be used in process control (PLC/DCS modules), medical and scientific multi-channel instruments and chromatographs.