Texas Instruments – Analog Front End (AFE)


The LM98640QML is a fully integrated, high performance 14-Bit, 5 MSPS to 40 MSPS signal processing solution for image processing applications. The LM98640QML is Radiation tolerant up to a total ionizing dose of 100 krads allowing it to be used in space imaging applications. Configuration Registers are Single Event Functional Interrupt Free up to 120 MeV-cm2/mg. The Serial LVDS Output format performs well during ionizing doses, preventing data loss. The LM98640QML has an adaptive power scaling feature to optimize power consumption based on the operating frequency and amount of gain required. 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 Contact Image Sensors and CMOS image sensors). The sampling edges are programmable to a resolution of 1/64th of a pixel period. Both the CDS and S/H have a programmable gain of either 0dB or 6dB. The signal paths utilize two ±8 bit offset correction DACs for coarse and fine offset correction, and 8 bit Programmable Gain Amplifiers (PGA) for each channel. The PGA and offset DAC are programmed independently allowing unique values of gain and offset for each input.


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January 4, 2015 |
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