LM98722 Datasheet | National Semiconductor

Description 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. Highspeed 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 45MHz high performance analog-to-digital converter (ADC). The fully differential processing channel shows exceptional noise immunity, having a very low noise floor of -74d B. 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 pliance and reduce system costs. Features - - - - - - - - LVDS/CMOS Outputs LVDS/CMOS/Crystal Clock Source with PLL Multiplication Integrated Flexible Spread Spectrum Clock Generation CDS or S/H Processing for CCD or CIS sensors Independent Gain/Offset Correction for Each Channel Automatic per-Channel Gain and Offset Calibration Programmable Input Clamp Voltage Flexible CCD/CIS Sensor Timing Generator Key Specifications - - - - - - - - - - - - - - - - Maximum Input Level 1.2 or 2.4 Volt Modes (both with + or - polarity option) ADC Resolution 16-Bit ADC Sampling Rate 45 MSPS INL +18/-25 LSB (typ) Channel Sampling Rate 22.5/22.5/15 MSPS PGA Gain Steps 256 Steps PGA Gain Range 0.64 to 8.3x Analog DAC Resolution +/-9 Bits Analog DAC Range +/-307m V or +/-614m V Digital DAC Resolution +/-6 Bits Digital DAC Range -2048 LSB to + 2016 LSB...