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CDB5360 Folha de dados(PDF) 3 Page - Cirrus Logic

Nome de Peças CDB5360
Descrição Electrónicos  Evaluation Board
Download  18 Pages
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Fabricante Electrônico  CIRRUS [Cirrus Logic]
Página de início  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

CDB5360 Folha de dados(HTML) 3 Page - Cirrus Logic

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CDB5334/35/60
DS194DB3
3
circuit. The analog input connector is a standard fe-
male XLR with Pin 2 positive, Pin 3 return, and Pin
1 shield.
R1, R5, and C8 form an RC network which pro-
vides anti-alias filtering and the optimum source
impedance for the CS5334, CS5335, or CS5360
right channel inputs. R2, R3, and C42 duplicate this
function for the left channel.
Space has been left on the evaluation board for in-
put protection diodes D1-D4 on the right channel,
and D8-D11 on the left channel, shown in Figure 3.
These diodes are optional as the CS5334, CS5335,
and CS5360 are able to withstand input currents of
100mA
maximum,
as
stated
in
the
CS5334/CS5335 and CS5360 data sheets. The out-
put current from the op-amp used in the analog fil-
ter on the evaluation board is not able to deliver a
current that exceeds 100mA. Input protection di-
odes are recommended if there is a possibility that
over-range signals could be applied at the ADC in-
puts which exceed this level. See the application
note, "A/D Converter Input Protection Techniques"
in the 1994 Crystal Semiconductor Audio Da-
tabook.
CS5334, CS5335, and CS5360 A/D
Converters
The CS5334, CS5335, and CS5360 A/D converters
are shown in Figure 4. A description of these devic-
es are included in the CS5334/CS5335 and CS5360
data sheets.
CS8402A Digital Audio Interface
Figure 5 shows the circuitry for the CS8402A dig-
ital audio interface transmitter. The CS8402A can
implement AES/EBU, S/PDIF, and EIAJ-340 in-
terface standards. The Digital Interface Format
(DIF) for the transmitter is set automatically to
match the format chosen for the CS5334, CS5335,
or CS5360 (the DIF is selected by the DIF1 and
DIF0 switches on SW1, as defined in Table 3).
SW2 provides 8 DIP switches to select various
modes and bits for the CS8402A; switch defini-
tions and the default settings for SW2 are listed in
Tables 4 and 5. Digital outputs are provided on an
RCA connector via isolation transformer and on an
optical transmitter. For more detailed information
on the CS8402A and the digital audio standards,
see the CS8401A/CS8402A data sheet.
Serial Output Interface
A serial output interface is provided on HDR2, as
shown in Figure 6. When the SMODE1 and
SMODE2 jumpers, defined in Table 2, are set to
the MASTER position, MCLK, SCLK, LRCK,
SDATA, and FRAME signals are outputs. When
the SMODE1 and SMODE2 jumpers are in the
SLAVE position, MCLK, SDATA, and FRAME
are outputs, while SCLK and LRCK become in-
puts. Hence, in SLAVE mode, the SCLK and
LRCK signals must be externally derived from
MCLK to run the ADC. All signals are buffered in
order to isolate the converter from external circuit-
ry. Signal buffering is provided by a 74HCT243
transceiver (U10) and a 74HCT541 buffer (U11).
ALTERA PLD AND PEAK SIGNAL
LEVEL LEDS
The Altera EPM7128 programmable logic device
(PLD), shown in Figure 8, is designed to support
three major features on the evaluation board. First,
it automatically configures the CS8402A transmit-
ter to accept the Digital Interface Format chosen for
the CS5334, CS5335, or CS5360. Second, the PLD
provides a 128x Fs master clock for the CS8402A.
Third, it decodes and updates the Peak Signal Level
(PSL) bits which give information about the ampli-
tude of the input signal.
CS8402A Format Configuration
The CS5334, CS5335, and CS5360 support three
Digital Interface Formats for both master and slave
configurations. Format 0 has valid data on the ris-
ing edge of SCLK. The CS8402A transmitter has
no corresponding mode which matches Format 0,


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