LMH0051 반도체 회로 부품 판매점
(LMHxxxx) DVB-ASI SDI Deserializer
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 National Semiconductor |
ADVANCE INFORMATION
April 2007
LMH0341, LMH0041, LMH0071, LMH0051
3G, HD, SD, DVB-ASI SDI Deserializer with Loopthrough
and LVDS Interface
General Description
The LMH0041 family of products provide a very simple 1:5
deserializer and receiver function. The device is intended to
be paired with an FPGA host which will receive the raw 5 bit
data words and will decode the data appropriately such that
a SMPTE standard signal may be recovered. The devices are
designed to receive data compliant with DVB-ASI, SMPTE
259M, SMPTE 292M and/or SMPTE 424M. The interface be-
tween the LMH0041 and the FPGA consists of a 5 bit wide
LVDS bus, an LVDS clock and an SMBus interface. All de-
vices except for the LMH0051 includes a reclocked
feedthrough output with a SMPTE compliant cable driver. The
LMH0341 includes support for SMPTE424M, and the
LMH0071 is a Stadard Definition (SD) only variant. The prod-
uct is packaged in a physically small 48 pin LLP package.
Key Specifications
■ Output compliant with SMPTE 259M-C, SMPTE 292M,
SMPTE 424M and DVB-ASI
■ Typical power dissipation: 410 mW (loopthrough disabled)
■ 0.6 UI Input Jitter Tolerance
Features
■ LVDS Interface
■ Dual multiplexed inputs
■ No external VCO or clock required
■ Loopthrough with Cable Driver
■ SMBus configuration interface
■ 48 pin LLP package
Applications
■ SDI interfaces for:
— Video Cameras
— DVRs
— Video Switchers
— Video Editing Systems
Block Diagram
© 2007 National Semiconductor Corporation 300172
30017201
www.national.com
TABLE 1. Feature Table
Device SMPTE 424M Support SMPTE 292M Support SMPTE 259M Support DVB-ASI Support Active Loopthrough
LMH0341
×
×
× ××
LMH0041
× × ××
LMH0071
× ××
LMH0051
× ××
Device Operation
The LMH0041 deserializer is used in digital video signal orig-
ination equipment. It is intended to be operated in conjunction
with an FPGA host which processes the received data to re-
cover the original parallel data from the five bit wide datapath
that comes from the LMH0041. The LMH0041 requires the
use of an external equalizer such as the LMH0044, which can
be directly connected to the LMH0041.
ternal framer and 8b10b decoder is engaged such that the
data appearing on RX0-RX3 will represent a nibble of the de-
coded 8b10b data. RX4 is an Idle character detect and can
be used as an enable to allow the receiver to not write data
into a FIFO. RX4 is high if the data being presented on
RX0-RX3 represents the idle character. The Most Significant
Nibble of data is presented on the rising edge of RXCLK, and
the lease significant on the falling edge of RXCLK.
DVB-ASI Mode
DVB-ASI mode is enabled when the DVB-ASI pin is brought
to a high state. When the DVB-ASI mode is enabled, an in-
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국내 전력반도체 판매점
상호 : 아이지 인터내셔날
전화번호 : 051-319-2877
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