CDB4228A Cirrus Logic Inc, CDB4228A Datasheet - Page 4

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CDB4228A

Manufacturer Part Number
CDB4228A
Description
Development Kit
Manufacturer
Cirrus Logic Inc
Datasheet

Specifications of CDB4228A

Silicon Manufacturer
Cirrus Logic
Application Sub Type
Codec
Kit Application Type
Audio / Video / TV
Silicon Core Number
CS4228A
Features
PC Software Provides Easy To Use Board & Device Control
Kit Contents
Evaluation Board
Rohs Compliant
No
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
1. CDB4228A SYSTEM OVERVIEW
The CDB4228A evaluation board is an excellent
means of quickly evaluating the CS4228A. Input
and output analog interfaces are provided as well as
a CS8414 digital interface receiver and CS8404
digital interface transmitter that provide an easy in-
terface to digital audio test equipment. The evalua-
tion board also allows the user to interface external
systems’ digital audio clocks and data through the
digital audio port (DAP) 20-pin header. An exter-
nal two wire or SPI control interface is also provid-
ed through a 10-pin header for easy system
development using the evaluation board.
The CDB4228A schematic has been partitioned
into 17 schematics shown in Figures 1 through 17.
Each partitioned schematic is represented in the top
level schematic shown in Figure 1.
2. CS4228A CODEC
A complete description of the CS4228A CODEC is
included in the CS4228A data sheet.
3. BOARD CONTROL
3.1
The CDB4228A is shipped with Windows based
graphical user interface (GUI) software for inter-
facing with the CS4228A control port via a PC par-
allel port connected to the DB25 connector, J15.
Parallel port control is selected by placing the
CONTROL switch S2 in the PP position. The soft-
ware can be used to communicate with the
CS4228A in two wire or SPI mode by selecting the
MODE switch S4. Further documentation for the
software is available on the distribution diskette in
the plain text format file, README.TXT.
3.2
The evaluation board can also be controlled via a
external host such as a microcontroller connected
to the EXTRNL CONTROL port JP9 by placing
the CONTROL switch S2 in the EXTRNL posi-
tion. For more information, see section 7.
4
Graphical User Interface
External Control Interface
4. DIGITAL AUDIO I/O
4.1
Digital-to-Analog (DAC) performance can be
quickly tested by connecting a S/PDIF audio
source to the CS8414 receiver. The S/PDIF input
can be either optical or coax, see Figure 16. How-
ever, both inputs cannot be driven simultaneously.
The interface for the CS8414 includes a serial bit
clock, serial data, left-right clock (FSYNC), and a
256 Fs master clock. The bit clock and left-right
clock signals are bidirectional, and as a pair can be
selected to supply these signals to the system, or
can be selected as inputs from the CS4228A or
DAP. The receiver data output can be simulta-
neously connected to the SDIN1, SDIN2, and
SDIN3 inputs on the CS4228A.
The receiver can be powered down to prevent asyn-
chronous clock interference by depressing all three
rocker switches to the OFF position on the RX
PWR DIP switch S1.
The operation of the CS8414 and a discussion of
the digital audio interface are included in the
CS8414 data sheet.
4.2
The analog-to-digital converter performance can
be quickly evaluated by connecting an analog gen-
erator to the left and right inputs, and connecting
the S/PDIF optical or coaxial output to audio test
equipment. The CS8404 digital interface transmit-
ter is connected to the CODEC serial data output
SDOUT, and the system bit clock, left-right clock
and master clock as shown in Figure 17. The trans-
mitter and CS4228A share several serial modes,
but not all modes of each device are supported.
SMODE 4 and 5 will not work properly with the
transmitter: The data will be right-shifted by 8 bits.
The transmitter must always be supplied a 128 Fs
master clock, which is supplied by clock dividers
within the PLD. The clock divider source is the
same as that selected for the CS4228A MCLK. The
Receiver
Transmitter
CDB4228A
DS511DB1

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