ADAS1127 Datasheet | Analog Devices

Features 64-channel, low level current-to-digital converter Up to 24-bit resolution Up to 19.7 k SPS (50.7 μs integration time) Simultaneous sampling Ultralow noise (down to 0.4 f C [2500e- ]) User-adjustable full-scale range INL: ±0.025% of reading ±0.75 ppm of FSR Very low power dissipation: 6.25 m W/channel LVDS self-clocked serial data interface SPI configuration registers (daisy-chain) On-board temperature sensor and reference buffer 10 mm × 10 mm, mini-BGA package Low cost external ponents Support tools Evaluation board Reference design with reference layout FPGA Verilog code GENERAL DESCRIPTION The ADAS1127 is a 64-channel, current-to-digital, analog-todigital converter (ADC). It contains 64 low power, low noise, low input current integrators, simultaneous sample-and-holds, and a 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 selfclocked serial interface, which reduces external hardware. An SPI-patible 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 ADAS1127 uses the separate supply IOVDD to reduce the digital noise effect on the conversions. The ADAS1127 is in a 10 mm × 10 mm, mini-BGA package. For more information on the ADAS1127, contact Analog Devices, Inc, at adas@analog.. 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 SDO TO ALL ADCs AN0 F S/H OR0 CONFIGURATION SCK CS RESET SDI AN31 F S/H OR31 + ADCL - AN32 F S/H OR32 OR[0:63] TEMPERATURE IOVDD IOGND AN63 KGND F S/H OR63 SDI 2.5V VIO DATA PROCESSING LVDS/CMOS INTERFACE DOUTx CLKx SYNC FPGA BUFP BUFN 2.048V Figur...