CS8420-CS Cirrus Logic Inc, CS8420-CS Datasheet - Page 13

• Manufacturer Part Number: CS8420-CS
• Description: Transceiver IC
• Manufacturer: Cirrus Logic Inc

Specifications of CS8420-CS

• Audio Control Type: Sample Rate Converter
• Supply Voltage Range: 4.75V To 5.25V
• Operating Temperature Range: -10°C To +70°C
• Audio Ic Case Style: SOIC
• No. Of Pins: 28
• Msl: MSL 2 - 1 Year
• Frequency Max: 108GHz
• Bandwidth: 20kHz
• Rohs Compliant: No
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

direct 256*Fsi clock input via the RMCK pin, in-
stead of the PLL.
Figure 9 shows audio data entering via the AES3
Receiver. The PLL locks onto the pre-ambles in the
incoming audio stream, and generates a 256*Fsi
clock. The rate converted data is then output via the
serial audio output port and via the AES3 transmit-
ter.
Figure 10 shows the same data flow as Figure 7.
The input clock is derived from an incoming AES3
data stream. The incoming data must be synchro-
nous to the AES3 data stream.
Figure 11 shows the same data flow as Figure 7.
The input data must be synchronous to OMCK.
The output data is clocked by the recovered PLL
DS245PP2
Figure 7. Serial Audio Input, using PLL, SRC enabled
ILRCK
ISCLK
SDIN
RXN
RXP
Data Flow Control Bits
Data Flow Control Bits
Figure 9. AES3 Input, SRC enabled
TXD1-0:
SPD1-0:
SRCD:
TXD1-0:
SPD1-0:
SRCD:
Serial
Audio
Input
PLL
AES3
Rx &
Decode
PLL
00
00
0
RMCK
00
00
1
RMCK
Sample
Rate
Converter
Sample
Rate
Converter
OMCK
Clock Source Control Bits
OMCK
Clock Source Control Bits
OUTC:
INC:
RXD1-0:
OUTC:
INC:
RXD1-0:
AES3
Encoder
& Driver
Serial
Audio
Output
AES3
Encoder
& Driver
Serial
Audio
Output
0
0
00
0
0
01
OLRCK
OSCLK
SDOUT
TXP
TXN
OLRCK
OSCLK
SDOUT
TXP
TXN
clock from an AES3 input stream. This may be
used to implement a “house sync” architecture.
Figure 8 shows audio data entering via the AES3
receiver, passing through the sample rate converter,
and then exiting via the serial audio output port.
Synchronous audio data may then be input via the
serial audio input port and output via the AES3
transmitter.
Figure 13 is the same as Figure 12, but without the
sample rate converter. The whole data path is
clocked via the PLL generated recovered clock.
Figure 14 illustrates a standard AES3 receiver
function, with no rate conversion.
Figure 15 shows a standard AES3 transmitter func-
tion, with no rate conversion.
Figure 8. Serial Audio Input, No PLL, SRC enabled
ILRCK
ISCLK
SDIN
Figure 10. Serial Audio Input, AES3 Input Clock
ISCLK
ILRCK
SDIN
RXN
RXP
Data Flow Control Bits
Data Flow Control Bits
TXD1-0:
SPD1-0:
SRCD:
Serial
Audio
Input
TXD1-0:
SPD1-0:
SRCD:
AES3
Rx
Serial
Audio
Input
00
00
0
RMCK
Sample
Rate
Converter
PLL
00
00
0
RMCK OMCK
Sample
Rate
Converter
OMCK
Clock Source Control Bits
OUTC:
INC:
RXD1-0:
Clock Source Control Bits
OUTC:
INC:
RXD1-0:
AES3
Encoder
& Driver
Serial
Audio
Output
AES3
Encoder
& Driver
Serial
Audio
Output
0
0
10
0
0
01
OLRCK
OSCLK
SDOUT
TXP
TXN
CS8420
OLRCK
OSCLK
SDOUT
TXP
TXN
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