february 21, 2008 LM98620 10-bit 70 msps 6 channel imaging signal processor with lvds output general description the LM98620 is a fully integrated, 10-bit, 70 msps signal processing solution for high performance digital color copiers, scanners, and other image processing applications. high- speed signal throughput is achieved with an innovative six channel architecture utilizing correlated double sampling (cds), or sample and hold (sh) type sampling. 1x or 2x gain settings are available in the cds/sh input stage. each chan- nel has a dedicated 1x to 10x (8 bit) pga that allows accurate gain adjustment of each channel. the digital white level auto calibration loop can automatically set the pga value to achieve a selected white target level. each channel also has a 4 bit coarse and 10-bit fine analog offset correction dac that allows offset correction before the sample-and-hold am- plifier. these correction values can be controlled by an auto- mated digital black level correction loop. the pga and offset dacs for each channel are programmed independently al- lowing unique values of gain and offset for each of the six channels. a 2-to-1 multiplexing scheme routes the signals to three 70mhz high performance adcs. the fully differential processing channels achieve exceptional noise immunity, having a very low noise floor of -68.5db. the 10-bit analog- to-digital converters have excellent dynamic performance making the LM98620 transparent in the image reproduction chain. features 3.3v single supply operation cds or s/h processing 35 mhz channel rate enhanced esd protection on timing, control and lvds pins low power cmos design 12 pin to 16 pin (selectable) lvds serialized data output 4-wire serial interface 2 channel symmetrical architecture independent gain and offset correction for each channel digital black level calibration for each channel digital white level calibration for each channel programmable input clamp key specifications maximum input level 1.2 vp-p (cds gain = 1.0) 0.58 vp-p (cds gain = 2.0) input sample rate 5 to 35 msps - 6ch mode 10 to 35 msps - 3ch mode pga gain range 1x to 10x (0 to 20 db) cds/sh gain settings 1x or 2.1x total channel gain 1x to 21x (0 to 26 db) pga gain resolution 8 bits - analog adc resolution 10 bits adc sampling rate 10 to 70 msps snr 68.5 db (gain = 1x) offset dac range 111 mv or 59.5 mv- fdac 281 mv - cdac offset dac resolution 10 bits - fdac 4 bits - cdac supply voltage 3.0v to 3.6v power dissipation 1.02 w (typical) system block diagram 30032304 ? 2008 national semiconductor corporation 300323 www.national.com LM98620 10-bit 70 msps 6 channel imaging signal processor with lvds output
chip block diagram 30032301 www.national.com 2 LM98620
channel block diagram 30032302 ordering information commercial temperature range ns package LM98620vhb 80-pin tqfp 3 www.national.com LM98620
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physical dimensions inches (millimeters) unless otherwise noted 80-lead tqfp ns package number vhb80a 5 www.national.com LM98620
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