CX25851 View Datasheet(PDF) - Conexant Systems
Part Name
Description
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CX25851 Datasheet PDF : 2 Pages
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Video
Video Surveillance/Security Applications
Multi-Channel Video Decoder
CX25850/1/3
0
Conexant’s portfolio includes a comprehensive suite of semiconductor
solutions for broadband communications and the digital home.
High Quality Integrated Video Surveillance System Front-End
The CX25850/1/3 multi-channel video decoder devices contain fast locking
and low signal locking features designed specifically for the video surveillance
market. The CX25850 and CX25851 both integrate four analog video decoders,
each with a high-performance 10-bit ADC, full 10-bit data path through the
decoder, and independent scaling. Eight composite video inputs allow the
user to multiplex between two cameras on each video decoder input. The
CX25853 integrates eight of the same high quality decoders and sixteen
composite video inputs. The CX25850/1/3 also contain two analog video
encoders and a digital monitor output port. All three devices support BT.656
digital video interfaces. The CX25851 also supports Synchronous Pixel
Interface (SPI) digital video interfaces. All devices are designed for PC-based
and embedded/stand-alone security Digital Video Recorders (DVRs).
Flexible Architecture
With two composite input ports per decoder, the CX25850/1 supports direct
connections for eight cameras, and the CX25853 supports sixteen cameras.
This eliminates the need for external video multiplexers in systems where two
cameras share a video decoder. Additionally, the CX25850/1/3 contains two
on-board, high quality analog video encoders with dedicated BT.656 input pins.
Alternatively, these encoders may be driven by streams internal to the device.
These encoders provide surveillance DVR manufacturers with a convenient way
of driving external monitors. When connected to the monitor output port, the
CX25850/1/3 offers users the opportunity to “scroll” between decoder outputs
at fixed intervals and/or switch to view a specific decoder output.
Ease of Use
The CX25850/1/3 requires minimal programming for startup using an I2C serial
protocol. The devices are preconfigured in a default mode for development,
verification, and fast prototyping. The fast locking and low signal locking
features were developed and optimized specifically for the video surveillance
market. Fast locking ensures that each decoder within the CX25850/1/3
will lock to a new/switched input within one field, a feature that is useful in
multiplexed camera systems. Low signal locking ensures that each decoder
within the CX25850/1/3 will lock to composite signals as low as 100 mV
peak-to-peak, a feature that helps in systems where cameras and feeds
are not perfectly terminated.
Distinguishing Features
• Integrated NTSC/PAL video decoding
and encoding
• 10-bit ADCs and DACs
• Analog composite video interfaces
• Multiple video decoders with 2 analog
composite inputs per decoder
• Fast locking (<1 field) and low signal
locking (100mVp-p)
• Independent scaling on each video
decoder path
• BT.656/VIP digital interfaces
• Dedicated monitor output programmable
to switch between decoder paths and/or
cascade multiple devices together
• Integrated anti-alias filters
• On-chip voltage regulator
• 20mm X 20mm eTQFP package and
13mm x 13mm fpBGA package (CX25850)
• 28mm X 28mm eLQFP package (CX25851)
• 28mm X 28mm eLQFP package and
19mm x 19mm fpBGA package (CX25853)
Part Number CX25850/1/3
Description Multi-Channel Video Decoder
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