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LM98503CCVV Datasheet

  • LM98503CCVV

  • 10-Bit, 18 MSPS Camera Signal Processor

  • 25頁(yè)

  • NSC

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LM98503 10-Bit, 18 MSPS Camera Signal Processor
October 2000
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.
N
Features
!
!
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+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 log
10
(V
IN
/ RMS Output Noise)
1.0 Volt peak-peak
18 MSPS
256 Steps
0.0 - 32.0 dB
10-Bit
18 MSPS
68dB @ 0dB Gain, 1.0V Input
86 mW (typical)
0
o
C to 70
o
C
Applications
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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
LM98503
10
Image Processor
Microcontroller
Sensor Driver
Timing Generator
Motor Controllers
漏 2000
National Semiconductor Corporation
www.national.com

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