DS90UA101-Q1 Datasheet, PDF (33/42 Pages) Texas Instruments – DS90UA101-Q1 Multi-Channel Digital Audio Link

DS90UA101-Q1
www.ti.com
SNLS441A – JULY 2013 – REVISED SEPTEMBER 2013
APPLICATIONS INFORMATION
AC Coupling
The SER/DES supports only AC-coupled interconnects through an integrated DC-balanced coding scheme.
External AC coupling capacitors must be placed in series with the serial interface signal path as illustrated in
Figure 30 or Figure 31. Applications utilizing STP cable require a 0.1 µF coupling capacitor on both outputs
(DOUT+, DOUT-). Applications utilizing single-ended 50Ω coaxial cable require a 0.1 µF capacitor on the true
serial interface output (DOUT+). The unused data pin (DOUT-) requires a 0.047 µF capacitor coupled to a 50Ω
resistor to GND.
SER
DOUT+
DOUT-
RIN+
RIN-
DES
Figure 30. AC-Coupled Connection (STP)
DOUT+
RIN+
SER
DOUT-
503
DES
503
RIN-
Figure 31. AC-Coupled Connection (Coaxial)
For high-speed serial transmissions, the smallest available package should be used for the AC coupling
capacitor. This will help minimize degradation of signal quality due to package parasitics.
Typical Application Connection
Figure 32 and Figure 33 show typical application connections of the DS90UA101-Q1 Serializer. The serial
interface outputs must have external 0.1 µF coupling capacitors connected to the high-speed interconnect. The
Serializer has internal termination.
Bypass capacitors are placed near the power supply pins. Ferrite beads should also be used for effective noise
suppression. The digital audio electrical interface is LVCMOS format. The V_DDIO pin may be connected to 3.3V or
1.8V. Device I²C address select is configured via the IDx pin.
Copyright © 2013, Texas Instruments Incorporated
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