128-Channel, 24-Bit Current-to-Digital ADC

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