DS30BA101

OUT-

IN+

IN-

OUT+

0.1 PF

50:

50:

953:

100:

1 PF

1 PF

1 PF

1 PF

DS30EA101

IN+

IN-

100:

OUT+

OUT-

100: Differential TP Cable

DS30EA101

www.ti.com

SNLS404A – FEBRUARY 2012 – REVISED APRIL 2013

DEVICE OPERATION

The DS30EA101 equalizes data transmitted over copper cables. It automatically adjusts its gain to reverse the

effects of the cable loss and restore the original signal. For proper operation, the launch amplitude of the signal

going into the cable (the signal amplitude prior to the cable attenuation) must be set appropriately. If the signal is

INPUT INTERFACING

The DS30EA101 accepts either differential or single-ended input. The input must be AC coupled. Figure 3 and

Figure 4 show the typical configurations for differential input and single-ended input, respectively. For single-

ended input, the unused input must be properly terminated as shown.

OUTPUT INTERFACING

The DS30EA101 output signals (OUT+ and OUT- ) are internally terminated 100

Ω LVDS outputs. These outputs

can be DC coupled to most common differential receivers.

LOS AND EN

LOS indicates the loss of signal at the DS30EA101 input. LOS is high when no input signal is present and low

when a valid input signal is detected.

EN can be used to manually disable or enable the OUT+ and OUT- output signals. Applying a high input to EN

will disable the DS30EA101 outputs by forcing the output to a logic 1, and applying a low input to EN will force

the outputs to be active. EN has an internal pulldown to enable the outputs by default.

LOS and EN may be tied together to automatically disable the DS30EA101 outputs when no input signal is

present.

APPLICATION INFORMATION

CABLE EXTENDER APPLICATION

The DS30EA101 together with the DS30BA101 form a cable extender chipset optimized for extending serial data

streams from serializer/deseralizer (SerDes) pairs and FPGAs over 100

Ω differential cables and 75Ω coaxial

cables. Setting the correct DS30BA101 output amplitude and proper cable termination are essential for optimal

operation. Figure 3 shows the recommended chipset configuration for 100

Ω differential cable and Figure 4 shows

the recommended chipset configuration for 75

Ω coaxial cable.

Figure 3. Cable Extender Chipset Application Circuit for 100

Ω Differential Cable

Copyright © 2012–2013, Texas Instruments Incorporated

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