CDB43122 Cirrus Logic Inc, CDB43122 Datasheet - Page 3

• Manufacturer Part Number: CDB43122
• Description: Development Kit
• Manufacturer: Cirrus Logic Inc

Specifications of CDB43122

• Silicon Manufacturer: Cirrus Logic
• Application Sub Type: DAC
• Kit Application Type: Data Converter
• Silicon Core Number: CS43122
• Features: Supports PCM Audio & SACD Audio, Requires Only Digital Signal Source
• Kit Contents: Evaluation Board
• Rohs Compliant: No
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

1.
The CDB43122 evaluation board is an excellent
means of quickly evaluating the CS43122 or
CS4397 24 bit - 192 kHz audio D/A converters.
The evaluation board features a CS8414 digital au-
dio input interface receiver, an analog output buff-
er/filter, and on board power supply regulation to
be used with a supplied AC Wall Mount power
supply. The CS8414 provides an easy interface to
32 kHz to 96 kHz digital audio signal sources. The
evaluation board also allows the user to supply ex-
ternal PCM data and DSD data through a 10-pin
header for system development.
2. CS43122 DIGITAL TO ANALOG
Please refer to the CS43122 or CS4397 product
datasheets for a complete detailed description of
these components.
3. CS8414 DIGITAL AUDIO RECEIVER
The system receives and decodes the standard
S/PDIF data format using a CS8414 Digital Audio
Receiver, Figure 1. The outputs of the CS8414 in-
clude a serial bit clock, serial data, left-right clock
(FSYNC), de-emphasis control and a 256 Fs mas-
ter clock. The operation of the CS8414 and a dis-
cussion of the digital audio interface are included in
the CS8414 datasheet.
4. EXTERNAL DIGITAL AUDIO DATA
The evaluation board has been designed to allow
interfacing to external systems via the 10-pin
header, JP1. This header allows the evaluation
board to accept externally generated clocks and da-
ta.
The port is activated by setting the “MODE” Con-
trol Switch “S2” position 6 “INT/EXT” switch to
the closed position.
This port accepts PCM data, DSD (CS4397) data
or data from an external 8X interpolator such as an
DS526DB1
CONVERTER
AND DSD INPUT PORT
CDB43122 SYSTEM OVERVIEW
HDCD PMD100 or PMD200. Notice that the
board has provisions for terminating this input port
for proper signal integrity using resistors R20
through R24.
The board also features automatic mode switching
between this port and the SPDIF port when used
with a SACD player. See Section 6- “Automatic
Mode Switching” for a complete description of this
feature.
5. MODE CONTROL
The board utilizes a Dip Switch, “S2” to allow the
user to select various operational modes of the
CS43122 or CS4397. These modes include selec-
tion of the Digital Interface Format, De-emphasis,
Sample Rate modes, Internal-External Digital Au-
dio Data, PCM-DSD Automatic Switching, 64x -
128x DSD Data, +3 V/+5 V Digital Supply voltage
selection, and Mute control. See Tables 1 through 7
for a complete description of how the switch set-
tings set the different operating modes of the
CS43122.
6. AUTOMATIC MODE SWITCHING
The board features an automatic PCM or DSD in-
put data switching mode for use with an external
SACD player. When used with an external SACD
player that has both a SPDIF output connected to
J1 (U5) and DSD data output connected to the JP1
port, will allow the board to switch automatically
between the two.
Theory of operation - When an SACD player
switches from playing a CD to a DSD disc, the SP-
DIF output data is disabled, the internal circuitry
(U6, U2, U3, U4, U7) detects loss of an SPDIF
source and automatically switches the Digital Data
Input path (U8) to the DSD input port JP1. This
feature can also be controlled from an external con-
trol signal by removing R60 and inputting a control
signal into JP2. Logic low = PCM mode, Logic
high = DSD mode.
CDB43122
3