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LM98725

National Semiconductor Corporation
Part Number LM98725
Manufacturer National Semiconductor Corporation
Description 81 MSPS Analog Front-End
Published Jun 14, 2009
Detailed Description LM98725 3 Channel, 16-Bit, 81 MSPS Analog Front End with LVDS/CMOS Output Integrated Sensor Timing Generator and SSCG w...
Datasheet PDF File LM98725 PDF File

LM98725
LM98725

Overview
LM98725 3 Channel, 16-Bit, 81 MSPS Analog Front End with LVDS/CMOS Output Integrated Sensor Timing Generator and SSCG www.
DataSheet4U.
com April 6, 2009 LM98725 3 Channel, 16-Bit, 81 MSPS Analog Front End with LVDS/ CMOS Output, Integrated CCD/CIS Sensor Timing Generator and SSCG General Description 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.
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 inputs.
The signals are then routed to a 81MHz 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 LM98725 transparent in the image reproduction chain.
A very flexible integrated SSCG (Spread Spectrum Clock Generation) modulator is included to assist with EM compliance 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 Gain and Offset for for Each Channel 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...


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