參數(shù)資料
型號(hào)： LM98503
廠商： National Semiconductor Corporation
英文描述： 10-Bit, 18 MSPS Camera Signal Processor
中文描述： 10位，18 MSPS的攝像機(jī)信號(hào)處理器
文件頁(yè)數(shù)： 1/25頁(yè)
文件大?。?/td> 203K
代理商： LM98503
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 log
10
(V
IN
/ 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
0
o
C to 70
o
C
Typical Digital Camera Block Diagram
C
LM98503
Sensor Driver
Timing Generator
Image Processor
Motor Controllers
Microcontroller
10
Auxiliary
Video Input
L
October 2000
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