LM98725 - 3 Ch 16-Bit 81 MSPS AFE w/ LVDS/CMOS Output & Integrated CCD/CIS Sensor Timing Generator

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.

• 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