EQCO62R20.3 Datasheet, PDF (4/34 Pages) Microchip Technology – EQCO62R20.3 6.25 Gbps Asymmetric Coax Equalizer

EQCO62R20.3/EQCO31R20.3
1.0 DEVICE OVERVIEW
The EQCO62T/R20 single-coax chipset is designed to
simultaneously transmit and receive signals on a single
75Ω coax cable. In one direction, a downlink signal is
transmitted. In the opposite direction, a lower-speed
uplink is provided. The EQCO62T/R20 chipset consists
of two chips. The EQCO62T20 is a high-speed line
driver with an integrated low-speed receiver. The
EQCO62R20 is a high-speed receiver with an
integrated low-speed transmitter. Figure 1-1 illustrates
a typical EQCO62T/R20 link setup.
The downlink signal is transmitted with 600 mV
transmit amplitude at the EQCO62T20 side. This signal
is attenuated in the coax and recovered by an equalizer
integrated in the EQCO62R20. The low-speed uplink is
transmitted with a lower amplitude of 130 mV to limit
the crosstalk with the downlink channel.
The downlink channel is intended for 8B/10B NRZ
coded data with bitrates from 1.25 Gbps up to 6.25
Gbps. The low-speed uplink operates at a bit rate of
21 Mbps, and has a single-ended LVTLL input and
output.
In addition to the downlink channel and the low-speed
uplink, the system allows power transmission over the
coax by using ferrite beads and external inductors.
These external inductors give the communication
channel a high-pass characteristic. The uplink receiver
inside the EQCO62T20 chip recovers the signal lost by
this high-pass filter. Appropriate inductors need to be
selected for correct operation of the link. Correct
operation is only guaranteed with the inductor
combination used in Figure 2-1, even though other
components might be suited.
The EQCO62T/R20 chipset is compatible with the
CoaXPress v1.1 camera standard.
FIGURE 1-1:
TYPICAL EQCO62T/R20 LINK SETUP
High
Definition
Camera
Up to
6.25 Gbps
downlink
Up to
900 mA DC
EQCO
62T20
21 Mbps
uplink
Up to 212 meters
75Ω Coax
Up to
900 mA DC
EQCO
62R20
Up to
6.25 Gbps
downlink
Frame
Store +
Camera
Control
21 Mbps
uplink
DS60001302B-page 4
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