128- channel, 24- bit current - to- digital adc ADAS1128 rev. spc 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 ri ghts 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 propert y of their respective owners. one technology way, p.o. box 9106, norwood, ma 02062 - 9106, u.s.a. tel: 781.329.4700 www.analog.com fax: 781.461.3113 ? 2009C 2010 analog devices, inc. all rights reserved. features 128- channel, low level current - to - digital converter up to 24 - bit resolution up to 19.7 ksps (50.7 s integration time) simultaneous sampling ultralow noise (down to 0.4 fc [2500 e ? ] ) user - adjustable full - scale range inl: 0.025% of reading 0.75 ppm of fsr very low power dissipation: 4.5 mw/channel lvds self - clocked serial data interface spi configuration registers ( d aisy - chain ) on - board temperature sensor and reference buffer 10 mm 10 mm, m ini- bga package low cost external components support tools evaluation board reference design with reference layout fpga verilog code applications medical, industrial, and security ct scanner data acquisition photodiode sensors dosimetry and radiation therapy systems optical fiber power monitoring x - ray det ection systems high channel - count data acquisition systems (current or voltage inputs) general description the ADAS1128 is a 128 - channel, current - to - digital, analog - to - digital converter (adc). it contains 128 low power, low noise, low input current integr ators, 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 ha rdware. 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 o n the conversions. the ADAS1128 is in a 10 mm 10 mm, mini - bga package. functional block dia gram f s/h or0 f s/h or63 adcl + ? an0 an63 f s/h or64 f s/h or127 adch + ? an64 an127 kgnd vt data processing lvds/cmos interface temperature or[0:127] ADAS1128 bufpl bufnl 2.5v 3.3v to next sdi sdi sdo bufph bufnh ref 2.048v sdi from previous sdo sdi ref configuration sck cs doutx clkx sync iovdd reset iognd to all adcs 2.5v from dout of other adcs fpga vio 08045-001 figure 1 .
ADAS1128 rev. spc | page 2 of 2 n otes ? 2009 C 2010 analog devices, inc. all rights reserved. trademarks and registered trademarks are the property of their respective owners. d08045f - 0- 9/10(spc)
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