EQCO30T5.2 Datasheet, PDF (8/22 Pages) Microchip Technology – EQCO30T5.2 3G/HD-SDI Video Cable Driver

EQCO30T5.2
2.0 APPLICATION INFORMATION
2.1 Typical Application Circuit as SMPTE Cable Driver
Figure 2-1 illustrates a typical schematic implementation
of the EQCO30T5 used as a cable driver for SMPTE
video signals.
FIGURE 2-1:
EQCO30T5.2 TYPICAL APPLICATION CIRCUIT AS SMPTE CABLE DRIVER
Resistors R8 and R9 are to be placed close to pins 12
and 11, respectively. From there onwards, the traces up
to the coax connectors should be laid-out as 75Ω traces
(including the C3 and C4 capacitors as AC-couplers).
2.1.1 RETURN-LOSS NETWORK
Competing cable drivers need external RL return-loss
networks. The EQCO30T5 does not need these type of
external networks. Figure 2-2 compares the output
network of the EQCO30T5 with the network of
competing cable drivers.
The EQCO30T5 is pin-compatible with other cable
drivers, but with a different component population. No
termination resistor to VCC is required (do not fit =
DNF). The inductor of the return loss network must not
be populated and the 75Ω resistor of this network
should be replaced with a 25Ω resistor to achieve
correct operation.
DS60001303C-page 8
 2012-2016 Microchip Technology Inc.