The ADAS1134 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, low voltage differential signaling (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 ADAS1134 uses IOVDD, a separate supply, to reduce digital noise effect on the conversions. The ADAS1134 is available in a 10 mm × 10 mm, 242-ball CSPBGA package. Applications * 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) * 128-channel, low level current-to-digital converter * Up to 24-bit resolution * Up to 22.6 kSPS (44.2 µs integration time) * Simultaneous sampling * No dead time, no loss of charge * Ultralow noise down to 0.32 fC rms (2000 e−) * User adjustable full-scale range * INL: ±0.05% of reading of ±1.0 ppm FSRI * Low power dissipation: 2.25 mW per channel * LVDS self clocked serial data interface * Serial peripheral interface (SPI) configuration registers (daisy-chain capability) * On-board temperature sensor and reference buffer * 10 mm × 10 mm, 242-ball CSPBGA package * See data sheet for additional features