ADAS1128 Datasheet

• 128-channel, low level current-to-digital converter
• Up to 24-bit resolution
• Up to 19.7 kSPS (50.7 μs integration time)
• Simultaneous sampling
• No dead time, no loss of charge
• Ultralow noise (down to 0.4 fC [2500e−])
• User-adjustable full-scale range
• INL: ±0.025% of reading ±0.75 ppm of FSR
• See data sheet for additional information

• Medical, industrial, and security CT scanner data acquisition
• Photodiode sensors
• Dosimetry and radiation therapy systems
• Optical fiber power monitoring
• X-ray detection systems
• High channel-count data acquisition systems (current or voltage inputs)

The ADAS1128 is a 128-channel, current-to-digital, analog-to-digital converter (ADC). It contains 128 low power, low noise, low input current integrators, simultaneous sample-and-holds, and two high speed, high resolution ADCs with configurable sampling rate and resolutions up to 24 bits.

All converted channel results are output on a single LVDS self-clocked serial interface, which reduces external hardware.

An SPI-compatible serial interface allows configuration of the ADC using the SDI input. The SDO output allows the user to daisy-chain several ADCs on a single, 3-wire bus. The ADAS1128 uses the separate supply IOVDD to reduce digital noise effect on the conversions.

The ADAS1128 is in a 10 mm × 10 mm, mini-BGA package.