DS90CP22

SNLS053E – MARCH 2000 – REVISED APRIL 2013

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COMPATIBILITY WITH LVDS STANDARD

The DS90CP22 is compatible with LVDS and Bus LVDS Interface devices. It is enhanced over standard LVDS

drivers in that it is able to driver lower impedance loads with standard LVDS levels. Standard LVDS drivers

provide 330mV differential output with a 100

Ω load. The DS90CP22 provides 365mV with a 75Ω load or 400mV

with 100

Ω loads. This extra drive capability is useful in certain multidrop applications.

In backplane multidrop configurations, with closely spaced loads, the effective differential impedance of the line is

reduced. If the mainline has been designed for 100

Ω differential impedance, the loading effects may reduce this

to the 70

Ω range depending upon spacing and capacitance load. Terminating the line with a 75Ω load is a better

match than with 100

Ω and reflections are reduced.

BLOCK DIAGRAM

Table 1. Function Table

SEL0

SEL1

OUT0

OUT1

Mode

0

0

IN0

IN0

1:2 splitter

0

1

IN0

IN1

repeater

1

0

IN1

IN0

switch

1

1

IN1

IN1

1:2 splitter

8

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