The LM98722 is a fully integrated, high performance 16-Bit, 45 MSPS signal processing
solution for digital color copiers, scanners, and other image processing applications. High-speed
signal throughput is achieved with an innovative architecture utilizing Correlated Double Sampling
(CDS), typically employed with CCD arrays, or Sample and Hold (S/H) inputs (for higher speed CCD or
CMOS image sensors). The signal paths utilize 8 bit Programmable Gain Amplifiers (PGA), a +/9-Bit
offset correction DAC and independently controlled Digital Black Level correction loops for each
input. The PGA and offset DAC are programmed independently allowing unique values of gain and
offset for each of the three analog inputs. The signals are then routed to a 45-MHz high
performance analog-to-digital converter (ADC). The fully differential processing channel shows
exceptional noise immunity, having a very low noise floor of 74dB. The 16-bit ADC has excellent
dynamic performance making the LM98722 transparent in the image reproduction chain.
A very flexible integrated Spread Spectrum Clock Generation (SSCG) modulator is included
to assist with EM compliance and reduce system costs.
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