GV7704 Datasheet, PDF (17/52 Pages) Semtech Corporation – Quad HD-VLC Receiver

4. Detailed Description
4.1 Functional Overview
The GV7704 is a low cost, quad channel HD-VLC receiver of compressed or
uncompressed high-definition video. With integrated cable equalizer technology, the
GV7704 is capable of receiving HD video at 270Mb/s and 1.485Gb/s over 75Ω coaxial
cable, or differentially over a 100Ω twisted pair cable.
The High Definition Visually Lossless CODEC (HD-VLC™) technology is integrated in
order to reduce the transmission data rate of HD video over both coaxial and unshielded
twisted pair (UTP) cable. This is achieved by encoding the HD-SDI video, normally
transmitted at a serial data rate of 1.485Gb/s, to the same rate as Standard Definition
(SD-SDI) video, at 270Mb/s serial data rate. This provides extended cable reach for HD
video up to 550m over Belden 543945 CCTV coax or 150m over Cat-5e/6 UTP cable.
The GV7704 features an audio de-embedding core, which provides the extraction of up
to 4 channels of I²S serial digital audio from the ancillary data space of the input video
data stream. The audio de-embedding core supports 32kHz, 44.1kHz and 48kHz sample
rates.
The device supports the reception of both 8-bit and 10-bit per pixel YCbCr 4:2:2 BT.1120
component digital video. A single 10-bit wide parallel digital video output bus per
channel is provided, with associated pixel clock and H/V/F timing signal inputs.
The GV7704 supports the extraction of ancillary data from the horizontal blanking of the
input video data stream. Ancillary data packets can be accessed via the GSPI, allowing
downstream communication from the video source to sink device. The GV7704
recognizes data packets formatted in compliance with the HDcctv 2.0 communications
protocol.
The device includes a 4-wire Gennum Serial Peripheral Interface (GSPI 2.0) for external
host command and control. All read or write access to the GV7704 is initiated and
terminated by the application host processor. The host interface is provided to allow
optional configuration of some of the functions and operating modes of the GV7704.
4.2 Serial Digital Inputs
The GV7704 can accept up to four separate channels of serial digital input signals
compliant with ITU-R BT.709, and ITU-R BT.1120-6. The four differential input channels
are CH0_SDI/CH0_SDI, CH1_SDI/CH1_SDI, CH2_SDI/CH2_SDI and CH3_SDI/CH3_SDI.
The GV7704 integrates adaptive 75Ω coaxial cable equalizer technology which is
capable of >50dB for HD-VLC encoded input signals and >35dB for HD uncompressed
signals.
GV7704
Preliminary Data Sheet Rev.3
PDS-060376
September 2015
www.semtech.com
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Semtech