CS8415A-CZ Cirrus Logic Inc, CS8415A-CZ Datasheet - Page 38

• Manufacturer Part Number: CS8415A-CZ
• Description: Receiver IC
• Manufacturer: Cirrus Logic Inc

Specifications of CS8415A-CZ

• Driver Case Style: TSSOP
• No. Of Pins: 28
• Mounting Type: Surface Mount
• No. Of Channels: 7
• Peak Reflow Compatible (260 C): No
• Supply Voltage: 5V
• Supply Voltage Max: 5V
• Leaded Process Compatible: No
• Interface Type: Serial
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

14. APPENDIX A: EXTERNAL
14.1 AES3 Receiver External Components
The CS8415A AES3 receiver is designed to accept
both the professional and consumer interfaces. The
digital audio specifications for professional use call
for a balanced receiver, using XLR connectors,
with 110 Ω ±20% impedance. The XLR connector
on the receiver should have female pins with a male
shell. Since the receiver has a very high input im-
pedance, a 110 Ω resistor should be placed across
the receiver terminals to match the line impedance,
as shown in Figure 12. Although transformers are
not required by the AES, they are, however, strong-
ly recommended.
If some isolation is desired without the use of trans-
formers, a 0.01 µF capacitor should be placed in se-
ries with each input pin (RXP0 and RXN0) as
shown in Figure 13. However, if a transformer is
not used, high frequency energy could be coupled
into the receiver, causing degradation in analog
performance.
Figures 12 and 13 show an optional DC blocking
capacitor (0.1 µF to 0.47 µF) in series with the ca-
ble input. This improves the robustness of the re-
ceiver, preventing the saturation of the transformer,
or any DC current flow, if a DC voltage is present
on the cable.
38
Twisted
AES3/SPDIF/IEC60958 RECEIVER
COMPONENTS
110 Ω
Pair
Figure 12. Professional Input Circuit
XLR
1
* See Text
110 Ω
CS8415A
RXP0
RXN0
Figure 13. Transformerless Professional Input Circuit
Twisted
In the configuration of systems, it is important to
avoid ground loops and DC current flowing down
the shield of the cable that could result when boxes
with different ground potentials are connected.
Generally, it is good practice to ground the shield
to the chassis of the transmitting unit, and connect
the shield through a capacitor to chassis ground at
the receiver. However, in some cases it is advanta-
geous to have the ground of two boxes held to the
same potential, and the cable shield might be de-
pended upon to make that electrical connection.
Generally, it may be a good idea to provide the op-
tion of grounding or capacitively coupling the
shield to the chassis.
In the case of the consumer interface, the standards
call for an unbalanced circuit having a receiver im-
pedance of 75 Ω ±5%. The connector for the con-
sumer interface is an RCA phono socket. The
receiver circuit for the consumer interface is shown
in Figure 14. Figure 15 shows an implementation
of the Input S/PDIF Multiplexer using the consum-
er interface.
The circuit shown in Figure 16 may be used when
external RS422 receivers, optical receivers or other
TTL/CMOS logic outputs drive the CS8415A re-
ceiver section.
14.2 Isolating Transformer Requirements
Please refer to the application note AN134: AES
and SPDIF Recommended Transformers for re-
sources on transformer selection.
110 Ω
Pair
XLR
1
* See Text
110 Ω
0.01 F
0.01 F
µ
µ
CS8415A
CS8415A
RXP0
RXN0
DS470PP3