128-Channel, 24-Bit Current-to-Digital ADC ADAS1134 Data Sheet FEATURES GENERAL DESCRIPTION 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 eā) 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 CSP_BGA package Low cost external components Support tools Evaluation board Reference design with reference layout FPGA Verilog code The ADAS1134 is a 128-channel, current-to-digital, analog-todigital 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 CSP_BGA 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) FUNCTIONAL BLOCK DIAGRAM 2.5V 3.3V TO NEXT SDI BUFPL REF F CONFIGURATION S/H RESET + ADCL ā AN63 SDI F S/H DATA PROCESSING AN64 LVDS/CMOS INTERFACE DOUTx CLKx SYNC F S/H TEMPERATURE + ADCH ā AN127 SCK CS IOVDD FPGA 2.5V VIO IOGND ADAS1134 F S/H SDI KGND VT BUFPH REF 2.048V SDI FROM DOUT OF OTHER ADCs FROM PREVIOUS SDO 13311-001 AN0 TO ALL ADCs SDO Figure 1. For more information about the ADAS1134, contact Analog Devices, Inc., at [email protected]. Rev. Sp0 Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 ©2015 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com ADAS1134 Data Sheet NOTES ©2015 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D13311F-0-7/15(Sp0) Rev. Sp0 | Page 2 of 2