LM98725

The LM98725 is a fully integrated, high performance 16-Bit, 81 MSPS signal processing solution for digital color copiers, scanners, and other image processing applications. The LM98725 achieves high-speed signal throughput 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 independently programmed PGA and offset DAC allow unique values of gain and offset for each of the three analog inputs. The signals are then routed to a 81 MHz high performance analog-to-digital converter (ADC). The fully differential processing channel shows exceptional noise immunity with a very low noise floor of –74 dB. The 16-bit ADC has excellent dynamic performance making the LM98725 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.