Frank Dehmelt ABSTRACT Multipoint LVDS (M-LVDS, TIA/EIA-899) devices e

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Frank Dehmelt ABSTRACT Multipoint LVDS (M-LVDS, TIA/EIA-899) devices e

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Suitable LVDS Architectures
Frank Dehmelt ABSTRACT Multipoint LVDS (M-LVDS, TIA/EIA-899) devices extend scope design problems than LVDS class devices transmit clock data signals. This application report summarizes different LVDS solutions available their application common architectures. European HPA/HPL/Interface
Contents Introduction LVDS Class Technologies LVDS LVDT LVDM BusLVDS M-LVDS Architectures Point-to-Point (Simplex operation, RS-232-like) Multidrop (Distributed simplex operation, RS-422-like) Multipoint (Multiplex operation, RS-485-like)
Conclusions Acronyms Glossary
Trademarks property their respective owners.
SLLA147
Introduction
advantages low-voltage differential signaling (LVDS) limited very high signaling rates, also electromagnetic interference (EMI) power. With release LVDS-Multipoint Standard (TIA/EIA-899), complete architectures supported using LVDS. With abundance LVDS-class solutions, well various topologies, there some uncertainty which type LVDS solution should applied each configuration. This report summarizes options provides glance information about applicability. more information benefits LVDS, comparisons other standards, etc., Texas Instruments internet site http://www.ti.com.
LVDS Class Technologies
LVDS
LVDS stands low-voltage differential signaling specified TIA/EIA-644 standard. dedicated point-to-point interfaces, allows multidrop (one driver, many receivers), section 3.2.
LVDT
LVDT Texas Instruments' nomenclature LVDS devices that provide integrated termination resistor. LVDS systems, load should 132- range with only termination (except case doubly terminated lines). Therefore, LVDT applicable line termination only. This ends segment LVDT devices should used intermediate nodes.
LVDM
LVDM Texas Instruments' nomenclature LVDS devices that provide twice output current standard LVDS, order support doubly terminated lines (two 100- terminations parallel appears load) allow multipoint applications (many drivers receivers bus). These devices were developed serve market demand such functions before multipoint-LVDS standard became available.
BusLVDS
BusLVDS National Semiconductors' version LVDM, again providing higher output current than standard LVDS. BusLVDS devices also support double termination allow multipoint applications (many drivers receivers bus). Neither BusLVDS LVDM standardized TIA/EIA other standards organizations.
M-LVDS
M-LVDS (Multipoint-LVDS) answer TIA/EIA industry's demand multipoint-LVDS standard. supports systems that allow nodes (drivers, receivers, transceivers) bus. parameters specified TIA/EIA-899 document. Devices available from Texas Instruments (designated with MLVD) will available soon from National Semiconductor.
Architectures
Different configurations commonly employed distribution clock data signals. Below, each architecture described brief applicable LVDS-class solutions identified.
Suitable LVDS Architectures
SLLA147
Point-to-Point (Simplex operation, RS-232-like)
driver, receiver, matched impedance (~100 transmission line board trace. termination mandatory receiver transmission media.
e.g. SN65LVDS1 e.g. SN65LVDS2 e.g. SN65LVDS1 e.g. SN65LVDT2
Applicable LVDS options:
LVDS LVDT external termination resistor) LVDM driver (with without additional termination resistor driver)
e.g. SN65LVDM176
e.g. SN65LVDM179
BusLVDS (again with without additional termination resistor driver) M-LVDS (with without additional termination resistor driver)
Multidrop (Distributed simplex operation, RS-422-like)
Multidrop operation implemented different ways. Multidrop operation refers situation where driver (note: must located bus) used with many receivers, with communication over matched impedance (~100 transmission line board trace. With multidrop operation double single line termination possible. With single termination shown figure below) matching resistor located bus. alternative, double termination used improve signal quality terminating driver output again bus. When doubly terminating bus, higher output drive devices should used (i.e. M-LVDS, LVDM BusLVDS).
e.g. SN65LVDS047 e.g. SN65LVDS048A e.g. SN65LVDS33
Applicable LVDS options: LVDS LVDM (with without additional termination resistor driver) BusLVDS (with without additional termination resistor driver) M-LVDS (with without additional termination resistor driver) LVDT receiver, (n-1) LVDS receivers (total receivers)
Suitable LVDS Architectures
SLLA147
Applicable LVDS option: LVDT more than LVDT device used, load significantly lower than nominal
Multipoint (Multiplex operation, RS-485-like)
Many drivers, receivers, transceivers multidrop with driver that bus), matched impedance (~100 transmission line board trace. termination needed both ends bus, which results nominal load Drivers must capable driving lower impedance.
e.g. SN65MLVD204 e.g. SN65MLVD204 e.g. SN65MLVD200
Applicable LVDS options: LVDS receivers LVDM BusLVDS M-LVDS
Applicable LVDS options: LVDS drivers LVDT receivers. more than LVDT devices used, load lower than nominal
Conclusions
well known architectures from standards such RS-232, RS-422, RS-485 implemented well with LVDS devices. Care must taken choose right device correct termination. This report helps designer determine proper solution.
Acronyms Glossary
BusLVDS LVDS LVDM LVDT M-LVDS National Semiconductors' nomenclature proprietary LVDS-for-multipoint solution Electronic Industries Association Electro-magnetic interference, susceptibility emission electromagnetic distortions Low-voltage differential signaling, according TIA/EIA-644, well Texas Instruments' nomenclature drivers receivers following this standard Texas Instruments' nomenclature proprietary LVDS-for-multipoint solution Texas Instruments' nomenclature LVDS receivers according TIA/EIA-644, that provide integrated termination Standardized multipoint LVDS according TIA/EIA-899. Texas Instruments designates these devices with MLVD
Suitable LVDS Architectures
SLLA147 Multidrop Multipoint Point-to-Point architecture: driver, many receivers architecture: combination many drivers, receivers, transceivers architecture: driver, receiver Telecommunications Industry Association
Suitable LVDS Architectures
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Frank Dehmelt ABSTRACT Multipoint LVDS (M-LVDS, TIA/EIA-899) devices e

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