CDB4364 Cirrus Logic Inc, CDB4364 Datasheet - Page 3

• Manufacturer Part Number: CDB4364
• Description: Eval Bd 6Chn DAC W/DSD Spt&Lw-Ltnc DF
• Manufacturer: Cirrus Logic Inc

Specifications of CDB4364

• Number Of Dac's: 6
• Number Of Bits: 24
• Outputs And Type: 6, Single Ended
• Sampling Rate (per Second): 192k
• Data Interface: Serial
• Dac Type: Voltage
• Voltage Supply Source: Analog and Digital
• Operating Temperature: -40°C ~ 85°C
• Utilized Ic / Part: CS4364
• Description/function: Audio D/A
• Operating Supply Voltage: 5 V
• Product: Audio Modules
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With/related Products: CS4364
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant, Contains lead / RoHS non-compliant

CDB4364
CDB4364 SYSTEM OVERVIEW
The CDB4364 evaluation board is an excellent means of quickly evaluating the CS4364. 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 or DSD clocks and data through
PCB headers for system development.
The CDB4364 uses the CDB4385 as a base PCB board. For this reason, there may be additional circuitry on board
which is not populated as it has no function for this device.
The CDB4364 schematic has been partitioned into 8 schematics shown in Figures 2 through 9. Each partitioned
schematic is represented in the system diagram shown in Figure 1 on page 6. Notice that the system diagram also
includes the interconnections between the partitioned schematics.
1. CS4364 DIGITAL TO ANALOG CONVERTER
A description of the CS4364 is included in the CS4364 datasheet.
2. CS8416 DIGITAL AUDIO RECEIVER
The system receives and decodes the standard S/PDIF data format using a CS8416 digital audio receiver
(Figure 5). The outputs of the CS8416 include a serial bit clock, serial data, left-right clock, and a 128/256 Fs master
²
clock. The CS8416 data format is fixed to I
S. The operation of the CS8416 and a discussion of the digital audio
interface are included in the CS8416 datasheet.
The evaluation board has been designed such that the input can be either optical or coaxial (See Figure 5). How-
ever, both inputs cannot be driven simultaneously.
Switch position 7 of S1 sets the output MCLK-to-LRCK ratio of the CS8416. This switch should be set to 256 (closed)
for inputs Fs ≤ 96 kHz and 128 (open) for Fs ≥ 64 kHz. The CS8416 must be manually reset using ‘HW RST’ (S2)
or through the software when this switch is changed.
3. INPUT FOR CLOCKS AND DATA
The evaluation board has been designed to allow interfacing to external systems via headers J11 and J7. Header
J11 allows the evaluation board to accept externally generated PCM clocks and data. The schematic for the
clock/data input is shown in Figure 6. Switch position 6 of S1 selects the source as either CS8416 (open) or header
J11 (closed).
Header J7 allows the evaluation board to accept externally generated DSD data and clocks. The schematic for the
clock/data input is shown in Figure 7. A synchronous MCLK must still be provided via Header J11. Switch position
8 of S1 selects either PCM (open) or DSD (closed).
Please see the CS4364 datasheet for more information.
4. INPUT FOR CONTROL DATA
The evaluation board can be run in either a stand-alone mode or with a PC. Stand-alone mode uses the CS4364 in
hardware mode and the mode pins are configured using switch positions 1 through 5 of S1. PC mode uses software
²
to setup the CS4364 through I
C using the PC’s serial or USB ports. PC mode is automatically selected when the
serial port (RS232 or USB) is attached and the CDB4364 software is running. The latest control software may be
downloaded from: www.cirrus.com/msasoftware.
™
²
Header J15 offers the option for external input of RST and SPI
/ I
S clocks and data. The board is setup from the
factory to use the on-board microcontroller in conjunction with the supplied software. To use an external control
DS619DB1
3