DS90LV032A Datasheet, PDF (4/9 Pages) National Semiconductor (TI) – 3V LVDS Quad CMOS Differential Line Receiver

Parameter Measurement Information (Continued)
C_L includes load and test jig capacitance.
S₁ = V_CC for t_PZL, and t_PLZ measurements.
S₁ = GND for t_PZH and t_PHZ measurements.
FIGURE 3. Receiver TRI-STATE Delay Test Circuit
DS100067-5
FIGURE 4. Receiver TRI-STATE Delay Waveforms
Typical Application
Balanced System
DS100067-6
FIGURE 5. Point-to-Point Application
DS100067-7
Applications Information
General application guidelines and hints for LVDS drivers
and receivers may be found in the following application
notes: LVDS Owner’s Manual (lit #550062-001), AN808,
AN1035, AN977, AN971, AN916, AN805, AN903.
LVDS drivers and receivers are intended to be primarily used
in an uncomplicated point-to-point configuration as is shown
in Figure 5. This configuration provides a clean signaling en-
vironment 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 impedance of
the media is in the range of 100Ω. A termination resistor of
100Ω should be selected to match the media, and is located
as close to the receiver input pins as possible. The termina-
tion resistor converts the driver output (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.
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