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LM98503 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM98503 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 25 page  © 2000 National Semiconductor Corporation www.national.com N LM98503 10-Bit, 18 MSPS Camera Signal Processor General Description The LM98503 is a CCD signal processor for digital cameras. The processor provides a common interface to a number of different image sensors including CCD, CMOS, and CIS. Correlated double sampling reduces kTC 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. 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 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 * Note: 20 log10 (VIN / RMS Output Noise) !Maximum Input Level 1.0 Volt peak-peak !CDS Sampling Rate 18 MSPS !PGA Gain Steps 256 Steps !PGA Gain Range 0.0 - 32.0 dB !ADC Resolution 10-Bit !ADC Sampling Rate 18 MSPS !*Signal-to-Noise Ratio 68dB @ 0dB Gain, 1.0V Input !Power Dissipation AV+ = DV+ = 2.7V 86 mW (typical) !Operating Temp 0oC to 70oC Typical Digital Camera Block Diagram LM98503 Sensor Driver Timing Generator Image Processor Motor Controllers Microcontroller 10 Auxiliary Video Input October 2000 |
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