LM98503 Datasheet | National Semiconductor

Description The LM98503 is a CCD signal processor for digital cameras. The processor provides a mon interface to a number of different image sensors including CCD, CMOS, and CIS. Correlated double sampling reduces k TC noise from the image signal. A fast, temperature stable, 8-bit digitally programmable gain amplifier enables pixel-rate white-balancing. An auxiliary input is provided, allowing for the selection of an external signal, useful for sampling analog video signals. The 10-bit A/D converter preserves the image quality with excellent noise performance. The LM98503 also includes the supporting functions of digital black level clamp and power down, ideally suited for portable video applications. This low-power processor is a natural choice for the most demanding imaging systems. Features ! ! ! ! ! ! ! ! ! +3 Volt single power supply Low power CMOS design 4-Wire serial interface 2.5V data output voltage swing AUX input with analog clamp and programmable gain Four color gain and offset registers Digital black level clamp Small 48-lead LQFP package Supports interlace and progressive scan CCDs. Key Specifications !Maximum Input Level !CDS Sampling Rate !PGA Gain Steps !PGA Gain Range !ADC Resolution !ADC Sampling Rate !- Signal-to-Noise Ratio !Power Dissipation AV+ = DV+ = 2.7V !Operating Temp - Note: 20 log10 (VIN / RMS Output Noise) 1.0 Volt peak-peak 18 MSPS 256 Steps 0.0 - 32.0 d B 10-Bit 18 MSPS 68d B @ 0d B Gain, 1.0V Input 86 m W (typical) 0o C to 70o C Applications ! ! ! ! ! ! ! ! Digital still cameras Digital video camcorders Video conferencing Security cameras Plain paper copiers Flatbed or handheld color scanners Video processing for X-ray or infrared Barcode scanners Typical Digital Camera Block Diagram Auxiliary Video Input CCD/CIS Sensor Image Processor Microcontroller Sensor Driver Timing Generator Motor Controllers © 2000 National Semiconductor Corporation .national. Block Diagram /CE SCLK SI DATA SO DATA VREFP VREFN...