CDB8416 Datasheet, PDF (4/28 Pages) Cirrus Logic – Evaluation Board

CDB8416
1. OVERVIEW
The CDB84166 evaluation board contains a
CS8416 and a CS8406 and the supporting circuitry
necessary to operate them. The board provides bal-
anced XLR and unbalanced optical and coaxial in-
puts and outputs as outlined in the AES3 and
IEC60958 standards. In Software Mode, the con-
trol registers of the CS8416 and CS8406 are set by
a Windows based program through the parallel port
of a PC.
1.1 CS8416 and CS8406
The features and functions of the CS8416 and the
CS8406 are described in their respective data
sheets.
1.2 Parallel Port
To use the CS8416 and CS8406 on the board in
Software Mode, the parallel port on the upper right
hand side of the board should be connected to the
parallel port of the PC running the CDB8416 con-
trol software.
1.3 Serial Digital Audio Inputs
The left edge of the board is occupied by a row of
serial digital audio input connectors. In either
Hardware or Software Mode the user must select
which inputs are to be used via the switch setting,
INPUT, on switch S3.
Set the switch to the open position to select the
XLR balanced input which will use the RXP1 and
RXN inputs of the CS8416.
Set the switch to the closed position to select the
optical/coaxial unbalanced inputs which will use
the RXP0 and RXP2 through RXP7 inputs of the
CS8416. This will AC couple the RXN input to
GND. Note that in Hardware Mode, only RXP0
through RXP3 on the CS8416 are available for use.
To select between the inputs in Hardware Mode,
use the RXSEL0 and RXSEL1 switches on S3.
1.4 Serial Digital Audio Outputs
The right edge of the board is occupied by the serial
digital audio outputs. The optical S/PDIF output is
always enabled. The user may also choose to en-
able either the coaxial S/PDIF output or the XLR
AES3 output via jumper J11. These outputs are
transformer coupled.
1.5 Three Wire (PCM) Serial Audio
Input and Output
Header J18 is provided so the user may access the
three wire serial audio ports of the receiver and
transmitter. The purpose of this port is to allow the
user to connect external circuitry such as a DAC,
ADC, or DSP to the receiver and transmitter. Sig-
nals going into or out of these headers should be
operated at VL+.
Setting switch S1-M/S in the open position sets the
CS8416 as the master and the CS8406 as slave for
LRCK and SCLK. Setting switch S1-M/S in the
closed position sets the CS8406 as the master and
the CS8416 as slave for LRCK and SCLK.
Setting switch S3-8416_PCM to the open position
will turn off all of the input/output buffers for the
CS8416. Setting switch S4-8406_PCM to the open
position will turn off all of the input/output buffers
for the CS8406. These switches allow the user to
independently set the input and output for the
CS8416 and CS8406.
1.6 Crystal Oscillators
Oscillator Y1 provides the System Clock (OMCK)
for the CS8416. The crystal oscillator on the board
is mounted in pin sockets that allow it to be re-
moved or replaced. The board is shipped with a
12.288 MHz crystal oscillator stuffed at Y1, setting
the output sampling rate to 48 kHz. Please refer to
the CS8416 data sheet for details on OMCK opera-
tion.
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DS578DB2