EQCO62T20.3 Datasheet, PDF (4/32 Pages) Microchip Technology – EQCO62T20.3 6.25 Gbps Asymmetric Coax Driver

EQCO62T20.3/EQCO31T20.3
1.0 DEVICE OVERVIEW
The EQCO62T/R20 single-coax chipset is designed to
simultaneously transmit and receive signals along with
power 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 trans-
mit 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
DS60001301B-page 4
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