EQCO62R20.3 Datasheet, PDF (8/34 Pages) Microchip Technology – EQCO62R20.3 6.25 Gbps Asymmetric Coax Equalizer

EQCO62R20.3/EQCO31R20.3
FIGURE 1-4:
PRINCIPLE OF EQUALIZER OPERATION
1.2.3 EQUALIZER CORE
The EQCO62R20 has an embedded equalizer in the
receive path with the following characteristics:
• Auto-Adaptive
The equalizer controls a multiple-pole analog filter
which compensates for attenuation of the cable, as
illustrated in Figure 1-4. The filter frequency response
needed to restore the signal is automatically determined
by the device using a time-continuous feedback loop
that measures the frequency components in the signal.
Upon the detection of a valid signal, the control loop
converges within a few microseconds.
• Variable Gain
The EQCO62R20 equalizer has variable gain to
compensate for low-frequency attenuation through the
coax and variations in transmit amplitude.
• Multi-Speed
The EQCO62R20 works at data rates from 1.25 Gbps
to 6.25 Gbps with 8B/10B coding.
Example equalizer performance measurements can be
found in Figure .
1.2.4 RX OUTPUT DRIVER
The output driver converts the output of the equalizer
core to a LVDS-like signal and sends it onto a 100Ω
differential transmission line.
DS60001302B-page 8
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