Module's pitch allows mounting on standard PCB substrate
A current-to-digital converter module, designed to reduce the cost and complexity of CT scanner system design, has been introduced by Analog Devices. Available in a 15mm² BGA package, the ADAS1131 is a 256-channel, 24-bit current-to-digital converter whose 0.8mm pitch enables designers to mount the device on a standard PCB substrate. This gives designers a less costly and higher yield option than high density, specialized PCB substrates requiring laser vias.
The company claims that the device uses approximately 33% less PCB area than alternative devices that offer only half the channel density. The module incorporates all associated internal buffers, decoupling and by-pass capacitors for data acquisition, further reducing component count and simplifying board layout. This is in addition to embedding 256 low-power, low-noise, low-input-current integrators, simultaneous sample-and-hold circuitry, and two high-speed A/D converters with configurable sampling rates.
The converter consumes 3 mW of power per channel at any throughput, which is the same as competing devices that integrate only 128 channels.
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