Delta-Sigma ADC Use Case: Industrial X-Ray and CT Machines
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This use case examines the application of the MDC91128 in industrial X-ray and CT machines.
Industrial X-ray is a non-destructive testing method that is widely used across the medical, food inspection, radiography, and security industries to provide accurate 2D readings of the size and type of materials, and to identify quality-impacting flaws. Computed tomography (CT) is closely related, combining X-ray images from various angles into a single 3D image. Within these X-ray and CT systems, data loss during analog-to-digital (A/D) conversion, noise performance, and controlling for the radiation dosage are three key design considerations.
The MDC91128 is a 128-channel, 20-bit or 16-bit, charge/current-input analog-to-digital converter (ADC) that provides an on-chip, 32 x 128 sample data buffer to ease the system timing requirements. This allows the system to reliably capture the data during A/D conversion. The device also features a dual-output serial interface for daisy-chaining multiple sub-systems, which leads to faster data transfer while maintaining resolution.
In terms of precision performance, the MDC91128 achieves low 20ppm RMS noise when using a 25pC range and 20pF sensor capacitance. Compared to competitors, the device offers the advantage of a flexible 4pC to 25pC input range to enable lower-dose industrial X-ray and CT applications. The MDC91128 achieves high-quality X-ray and CT images with its low input range, on-chip data buffer, and low-noise performance.
There is a lower-cost, 16-bit only version of the MDC91128 available with the MDC91127, as well as a 256-channel version with the MDC91256.
Additional features of the MDC91128 include:
- 1.8V Serial Interface to Lower the Power Requirements
- -40°C to +85°C Temperature Range
- ±0.025% INL at 4pC Range
- 166μs to 0.1s Integration Time
- 40pA to 150nA Input Current Range
- Daisy Chain for >128 Channels
- Single 5V Analog, 1.8V Digital Supplies
- Available in a BGA-440 Package (20mmx20mm)
For more information, explore MPS's versatile selection of data converters.
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