CDB4349 Cirrus Logic Inc, CDB4349 Datasheet - Page 4

• Manufacturer Part Number: CDB4349
• Description: BOARD EVAL FOR CS4349
• Manufacturer: Cirrus Logic Inc
• Series: Popguard®r

Specifications of CDB4349

• Number Of Dac's: 2
• Number Of Bits: 24
• Outputs And Type: 2, Single Ended
• Sampling Rate (per Second): 192k
• Data Interface: Serial
• Dac Type: Voltage
• Voltage Supply Source: Single
• Operating Temperature: -40°C ~ 85°C
• Utilized Ic / Part: CS4349
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

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1. CDB4349 SYSTEM OVERVIEW
The CDB4349 evaluation board is an excellent platform for quickly evaluating the CS4349. The CS8416 digital audio
interface receiver provides an easy interface to digital audio signal sources including the majority of digital audio test
equipment. The evaluation board also allows the user to supply external PCM clocks and data through headers for
system development.
The CDB4349 schematic has been partitioned into 6 pages, shown in
is represented in the system diagram shown in
connections between the partitioned schematics.
2. CS4349 DIGITAL-TO-ANALOG CONVERTER
A description of the CS4349 is included in the CS4349 datasheet, available at
ucts/pro/detail/P1116.html.
3. CS8416 DIGITAL AUDIO RECEIVER
The system receives and decodes the standard S/PDIF data format using a CS8416 digital audio receiver
(Figure
format is selected through switch S1. The operation of the CS8416 and a discussion of the digital audio interface is
included in the CS8416 datasheet, available at http://www.cirrus.com/en/products/pro/detail/P1005.html.
The CDB4349 has been designed so that the input can be either optical or coaxial (see
inputs cannot be driven simultaneously.
After the CS8416 serial format is changed either through S1 in Stand-Alone Mode, or though the CDB4349 GUI in
PC Mode, a reset is required. The CS8416 can be manually reset using ‘HARDWARE RESET’ (S2) in Stand-Alone
Mode, or through software when operating the CDB4349 in PC Mode.
4. INPUT FOR CLOCKS AND DATA
The evaluation board has been designed to allow external PCM data input through header J10. The schematic for
the clock/data input is shown in
CS8416 (open) or header J10 (closed). In PC Mode, the PCM source is selected through software.
5. INPUT FOR CONTROL DATA
The evaluation board can be run in either a Stand-Alone Mode or with a PC. Stand-Alone Mode does not require
the use of a PC, and the mode pins are configured using switch positions 1 through 5 of S4 and switch positions 1
and 2 of S1. PC Mode uses software to set up the CS4349 through I²C
or USB port. When the serial port (RS232) or USB is attached and the CDB4349 software is running, PC Mode is
automatically selected.
Header J38 offers the option for external input of RST and SPI/I²C clocks and data. The board is set up from the
factory to use the on-board microcontroller in conjunction with software available at
ucts/software/msaudio.html. To use an external control source, remove the shunts on J38 and place a ribbon cable
so the signal lines are on the center row and the grounds are on the right side. R89 and R90 should be populated
with 2 kΩ resistors when using an external I²C source which does not already provide pull-ups.
38). The outputs of the CS8416 include a serial bit clock, serial data, and a left-right clock. The CS8416 data
Figure
37. In Stand-Alone Mode, switch position 6 of S4 selects the source as either
Figure
34. Notice that the system diagram also includes the inter-
®
Figures 35
or SPI™ interface using the PC’s serial port
through 40. Each schematic page
http://www.cirrus.com/en/prod-
http://www.cirrus.com/en/prod-
Figure
39). However, both
CDB4349
DS782DB1