Texas Instruments 4Q 2006 manual LVDS, xECL, CML, Design Considerations, Technical Information

4LVDS, xECL, CML

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Design Considerations

Signaling Rate — TI offers repeaters/transla- tors and crosspoint switches with signaling rates up to 4.0 Gbps.

Jitter — Reducing jitter, the deviation of a signal timing event from its ideal position, has become a priority for ensuring reliability in high-speed data buses.

Skew — Excessive skew, the time delta between the actual and expected arrival

time of a clock signal, can limit the maximum bandwidth performance and lead to data sampling errors. Low skew specifications make high-speed interconnect devices excellent for signal buffering.

Power Consumption — Low-voltage differential signaling (LVDS) offers a low-power alternative to ECL and PECL devices. Current- mode drivers in LVDS produce a constant current, which allows power consumption to be relatively independent of frequency. The

constant current driver delivers about 3.5 mA to a 100-W load.

Technical Information

•LVDS is based on the TIA/EIA-644A standard conceived to provide a general- purpose electrical-layer specification for drivers and receivers connected in a point-to-point or multidrop interface.

LVDS Family of Products

16Channels

10Channels

8Channels Quads

Duals

Singles

		LVDS117
LVDS387	LVDS386	LVDS116		Up to 400 Mbps
				Up to 630 Mbps
		CDCLVD110
				≥ 1 Gbps
				Clock Distribution Devices
LVDS389	LVDS388A	LVDS108
		LVDS109		(See pg. 42 for table)
LVDS047	LVDS048A/348	LVDS104
LVDS31	LVDS32/33	LVDS105
LVDS3487	LVDS3486		LVDS250
LVDS391	LVDS390

LVDS9638	LVDS9637	LVDS049			LVDS22
	LVDS34	LVDS050			LVCP22
		LVDS051			LVCP23
		LVDS1050	CML100		LVDS122
			LVDS100
LVDS1	LVDS2	LVDS179
			LVDS101
		LVDS180
			LVDS16	LVP16
			LVDS17	LVP17
			LVDS18	LVP18
			LVDS19	LVP19
			LVDS20	LVP20
Transmitters	Receivers	Transceivers	Repeaters/		Crosspoint
			Translators		Switches

Resources For a complete list of resources (evaluation modules, data sheets and application notes), visit interface.ti.com

Literature		Literature
Number	Description	Number	Description

Application Notes

SLLA014A	Low-Voltage Differential Signaling (LVDS) Design Notes (Rev. A)
SLLA030C	Reducing Electromagnetic Interference with LVDS (Rev. C)
SLLA031A	Using an LVDS Receiver with TIA/EIA-422 Data (Rev. A)
SLLA034A	Slew Rate Control of LVDS Circuits (Rev. A)
SLLA038B	Interface Circuits for TIA/EIA-644 (LVDS) (Rev. B)
SLLA053B	Performance of LVDS with Different Cables (Rev. B)
SLLA054A	LVDS Multidrop Connections (Rev. A)
SLLA065	A Comparison of LinBiCMOS and CMOS Process Technologies in LVDS ICs
SLLA082B	Active Fail-Safe in TI's LVDS Receivers (Rev. B)
SLLA100	Increase Current Drive Using LVDS
SLLA101	Interfacing Different Logic with LVDS Receivers
SLLA103	LVPECL and LVDS Power Comparison
SLLA104	Suggestions for LVDS Connections
SLLA105	DSP to DSP Link Using LVDS
SLLA107	Live Insertion with Differential Interface Products
SLLA147	Suitable LVDS Architectures

Application Notes
SCAA059	AC-Coupling Between Differential LVPECL, LVDS, HSTL, and CML
SCAA062	DC-Coupling Between Differential LVPECL, LVDS, HSTL, and CML
Part Number		Description	Price*
Evaluation Modules (EVMs)
SN65LVDS31-32EVM		Evaluation Module for LVDS31 and LVDS32	49.00
SN65LVDS31-32BEVM		Evaluation Module for LVDS31 and LVDS32B	49.00
SN65LVDS31-33EVM		Evaluation Module for LVDS31 and LVDS33	49.00
SN65LVDS386EVM		SN65LVDS386 Evaluation Module	49.00
SN65LVDS387EVM		SN65LVDS387 Evaluation Module	49.00
SN65LVDS100EVM		SN65LVDS100 Evaluation Module	99.00
SN65LVDS20EVM		SN65LVDS20 Evaluation Module	49.00
SN65CML20EVM		SN65CML20 Evaluation Module	49.00
SN65LVCP22-23EVM		SN65LVCP22 Evaluation Module	25.00
SN65LVDS122EVM		SN65LVDS122 Evaluation Module	49.00
SN65LVDS250EVM		SN65LVDS250 Evaluation Module	49.00

Note: IBIS models are available at interface.ti.com *Suggested resale price in U.S. dollars.

Interface Selection Guide Texas Instruments 4Q 2006