DS90LT012AQ

SNLS297E – MAY 2008 – REVISED APRIL 2013

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Parameter Measurement Information (continued)

Figure 4. Receiver Propagation Delay and Transition Time Waveforms

Typical Applications

Figure 5. Balanced System — Point-to-Point Application

(DS90LT012AQ)

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-808 (SNLA028), AN-977 (SNLA166), AN-971 (SNLA165),

AN-916 (SNLA219), AN-805 (SNOA233), AN-903 (SNLA034).

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 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 impedance of the media is in the

range of 100

Ω. The internal termination 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.

The DS90LT012AQ differential line receiver is capable of detecting signals as low as 100 mV, over a ±1V

common-mode range centered around +1.2V. This is related to the driver offset voltage which is typically +1.2V.

The driven signal is centered around this voltage and may shift ±1V around this center point. The ±1V shifting

may be the result of a ground potential difference between the driver's ground reference and the receiver's

ground reference, the common-mode effects of coupled noise, or a combination of the two. The AC parameters

of both receiver input pins are optimized for a recommended operating input voltage range of 0V to +2.4V

4

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