DS90LV049Q_15 Datasheet, PDF (8/17 Pages) Texas Instruments – Automotive LVDS Dual Line Driver and Receiver Pair

DS90LV049Q
SNLS300D – MAY 2008 – REVISED APRIL 2013
Parameter Measurement Information (continued)
EN
1.5 V
1.5 V
1.5 V
EN
tPHZ
OUT
0.5 V
tPLZ
0.5 V
OUT
1.5 V
tPZH
50%
tPZL
50%
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3V
0V
3V
0V
VOH
VDD / 2
VDD / 2
VOL
Figure 10. Receiver TRI-STATE Delay Waveforms
Typical Application
Figure 11. Point-to-Point Application
APPLICATION INFORMATION
General application guidelines and hints for LVDS drivers and receivers may be found in the following application
notes: LVDS Owner's Manual (lit #550062-003), AN-805 (SNOA233), AN-808 (SNLA028), AN-903 (SNLA034),
AN-916 (SNLA219, AN-971(SNLA165), AN-977 (SNLA166).
LVDS drivers and receivers are intended to be primarily used in an uncomplicated point-to-point configuration as
is shown in Figure 11. This configuration provides a clean signaling environment for the fast edge rates of the
drivers. The receiver is connected to the driver through a balanced media which may be a standard twisted pair
cable, a parallel pair cable, or simply PCB traces. Typically, the characteristic differential impedance of the media
is in the range of 100 Ω. A termination resistor of 100 Ω (selected to match the media), and is located as close to
the receiver input pins as possible. The termination resistor converts the driver output current (current mode) into
a voltage that is detected by the receiver. Other configurations are possible such as a multi-receiver
configuration, but the effects of a mid-stream connector(s), cable stub(s), and other impedance discontinuities as
well as ground shifting, noise margin limits, and total termination loading must be taken into account.
The TRI-STATE function allows the device outputs to be disabled, thus obtaining an even lower power state
when the transmission of data is not required.
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