CDB5368 Datasheet by Cirrus Logic Inc.

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Evaluation Board for CS5368
Features
!Single-Ended to Differential Analog Inputs
!3.3 V Logic Interface
!Connection for DSP Serial I/O
!Windows®-Compatible CDB5368 Software
Supplied by Cirrus to Configure the CS5368
!On-Board CS8406 to Generate S/PDIF and
EIAJ-340 Digital Audio
!Requires Only an Analog Signal Source, Power
Supplies and, optionally, a PC for a Complete
Analog-to-Digital-Converter Evaluation System
Description
The CDB5368 evaluation board is an excellent means
for quickly evaluating the CS5368 24-bit, 192 kHz A/D
converter. Evaluation requires only a digital signal ana-
lyzer, an analog signal source, and a power supply.
On-board DIP switches configure the CS5368 in Stand-
Alone mode, avoiding the need for a PC.
For software-based device configuration, the Control
Port mode is used by attaching a host PC to the Evalu-
ation Board and executing the provided FlexGUI
software.
ORDERING INFORMATION
CDB5368 Evaluation Board
Ain+
Ain-
Clks/Data
Analog
Input
Buffers
RCA
Jacks
8051 Micro
RS232
USB
I²C or SPI
FPGA
Optical
Coaxial
CS8406
AES/EBU
S/PDIF
Transmitter
Buffers
Audio
8
8
8
CS5368 A/D
Clks/Data
Control
S/PDIF
Output
CDB5368
SEPTEMBER '05
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TABLE OF CONTENTS
1. CDB5368 System Overview..................................................................................................................... 3
2. Quick-Start Guide..................................................................................................................................... 3
3. Detailed Board Features .......................................................................................................................... 3
3.1 Stand-Alone Evaluation ............................................................................................................ 3
3.1.1 S1 and S4 Switch Operation .......................................................................................... 4
3.2 Control-Port Evaluation ............................................................................................................ 5
3.3 FlexGUI Hi-Level View ............................................................................................................. 6
3.4 FlexGUI Low-Level View .......................................................................................................... 7
3.5 Bit Definitions ........................................................................................................................... 8
3.5.1 CS5368 Bits .................................................................................................................... 8
3.5.2 FPGA Bits ....................................................................................................................... 8
4. CDB5368 Hardware................................................................................................................................. 9
4.1 Input and Output Connectors ................................................................................................... 9
4.2 Switches ................................................................................................................................. 10
4.3 User Configuration Jumpers .................................................................................................. 10
4.4 Reserved Factory Programming Jumpers ............................................................................. 10
4.5 Power Supply Circuitry ........................................................................................................... 11
4.6 Grounding and Power Supply Treatment ............................................................................... 11
4.7 FPGA Hardware ..................................................................................................................... 11
4.8 CS8406 S/PDIF Audio Transmitter ........................................................................................ 11
4.9 Serial Audio Interface ............................................................................................................. 11
4.10 Analog Input Buffer .............................................................................................................. 11
5. Schematics............................................................................................................................................. 12
6. Board Layout and Routing Plots ........................................................................................................... 21
7. Revision History ..................................................................................................................................... 24
LIST OF FIGURES
Figure 1. Hi-Level FlexGUI View ................................................................................................................. 6
Figure 2. FlexGUI Low-Level Register View ............................................................................................... 7
Figure 3. FPGA Low-Level Bit View ............................................................................................................ 8
Figure 4. CS5368 (Schematic page 1) ...................................................................................................... 12
Figure 5. Clock Generation (Schematic page 2) ....................................................................................... 13
Figure 6. FPGA (Schematic page 3) ......................................................................................................... 14
Figure 7. Control Port (Schematic page 4) ................................................................................................ 15
Figure 8. Clock and Data Buffers (Schematic page 5) .............................................................................. 16
Figure 9. CD8406 S/PDIF Output (Schematic page 6) ............................................................................. 17
Figure 10. Analog Inputs 1 to 4 (Schematic page 7) ................................................................................. 18
Figure 11. Analog Inputs 5 to 8 (Schematic page 8) ................................................................................. 19
Figure 12. Power (Schematic page 9) ....................................................................................................... 20
Figure 13. Top Silkscreen ......................................................................................................................... 21
Figure 14. Top Layer ................................................................................................................................. 22
Figure 15. Bottom Layer ............................................................................................................................ 23
LIST OF TABLES
Table 1. CDB5368 Input and Output Connectors ....................................................................................... 9
Table 2. CDB5368 Switches ..................................................................................................................... 10
Table 3. User Jumpers .............................................................................................................................. 10
Table 4. CDB5368 Reserved Jumpers ..................................................................................................... 10
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1. CDB5368 SYSTEM OVERVIEW
The CDB5368 Evaluation Board provides an excellent means of quickly evaluating the CS5368. A digital audio in-
terface transmitter (CS8406) provides an easy interface to digital audio signal analyzers, including the majority of
digital audio test equipment. Standard analog input and digital output connectors are included for quick and reliable
board setup. An on-board FPGA is used for configuring the various modes of the CS5368. Graphical User Interface
software is supplied by Cirrus Logic, which allows programming the CDB5368 when connected to a host PC running
Microsoft Windows®.
2. QUICK-START GUIDE
Confirm that DIP switches S1 and S4 are in the closed (LO) position, pushed down to the right.
Connect the following jumpers.
J7 - Install 5 jumpers to the left side of J7, enabling the DIP switches to operate correctly.
J81, J95 - Install jumpers to these positions, grounding XTI and XTO of the CS5368.
J1 - Install a jumper at the +5 V position, allowing VA to be supplied by the +5 V supply.
Install a 12.288 MHz canned Oscillator to socket Y1, providing a Master Timing Clock for the system.
Install a jumper to J11 at the OSC position to enable the OSC drive buffer.
Connect power supply common to the GND binding post. Connect +5 V, +12 V and -12 V to the binding
posts as marked on the board silkscreen
This configuration provides a completely operational 24-bit Analog-to-Digital-Converter evaluation system. The
CS5368 is operating as a Master Device in Single Speed Mode with a 48 kHz sampling rate. Apply power and con-
nect analog input signals of 1 Vrms maximum (full scale) to the RCA inputs jacks. S/PDIF Digital audio data is avail-
able for evaluation at the Optical and Coaxial outputs.
3. DETAILED BOARD FEATURES
The CDB5368 Evaluation Board supports both the Stand-Alone and Control Port modes of the CS5368. An FPGA
(U2) controls digital signal routing between the CS5368, the CS8406 and the DSP I/O header. For user-friendly eval-
uation of the TDM interface, the FPGA will translate TDM data into PCM data and send it to the CS8406.
3.1 Stand-Alone Evaluation
In Stand-Alone mode, the CDB5368 runs without an external PC attached. In this mode, the FPGA controls
operation of the board by dynamically reading DIP switches (S1 and S4) after a cold power-up or a push-
button board reset. Stand-Alone mode provides the most commonly used device settings. For additional
control of the CS5368, Control Port mode is used.
In Stand-Alone mode, as the DIP switches are repositioned, the FPGA simultaneously sets the appropriate
pins on the CS5368 and CS8406 to keep them synchronized with regard to sampling speed and data for-
mat.
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3.1.1 S1 and S4 Switch Operation
DIP Switch S1 contains six switches that function as described below.
M1,M0 set the device Speed Mode
0x00 Single Speed Master
0x01 Double Speed Master
0x10 Quad Speed Master
0x11 Slave all speed
DIF1,DIF0 set the Digital Audio Interface Data format
0x00 Left Justified
0x01 I²S
0x10 TDM 2-wire
0x11 TDM 4-wire
TDM1 and TDM0 support both TDM mode and PCM mode.
In TDM mode, TDM1 and TDM0 select two stereo pairs from a TDM stream, convert the data to Left-Jus-
tified PCM format then send the data to the CS8406 S/PDIF transmitter.
0x00 TDM Pair 1 (Channel 1, 2)
0x01 TDM Pair 2 (Channel 3, 4)
0x10 TDM Pair 3 (Channel 5, 6)
0x11 TDM Pair 4 (Channel 7, 8)
In PCM mode, TDM1 and TDM0 select which SDOUT is sent to the CS8406.
0x00 SDOUT1 (Channel 1, 2)
0x01 SDOUT2 (Channel 3, 4)
0x10 SDOUT3 (Channel 5, 6)
0x11 SDOUT4 (Channel 7, 8)
DIP Switch S4 contains two switches which function as described below.7
MDIV - divides the master clock by 2 when OPEN (HI).
CLKMODE - divides the master clock by 1.5 when OPEN (HI)
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3.2 Control-Port Evaluation
The CDB5368 is shipped with a Cirrus Logic designed Microsoft Windows-based program that allows full
control over the CS5368 internal registers. This software program is called the FlexGUI, and it is loaded by
executing the FlexLoader.exe file. Hardware interface to the FlexGUI is provided by connecting an RS-232
cable or a USB cable between a host PC and the CDB5368. Once the FlexGUI is loaded, the Evaluation
Board DIP switches are ignored, and all register settings are available for reading and writing using software
control. Testing configurations may be quickly reproduced by using the FlexGUI to save and restore unique
register settings.
Configure the board for Control Port operation using the instructions that follow.
Connect jumpers.
J7 - Install 5 jumpers to the left side of J7, enabling the I²C control interface.
J81, J95 - Install jumpers to these positions, grounding XTI and XTO of the CS5368.
J9 - Install a jumper at the +5 V position, allowing VA to be supplied by the +5 V supply (VA may be
externally supplied at the VA binding post by moving jumper J9 to the VA EXT position).
Add an oscillator of choice to socket Y1 to provide a Master Timing Clock for the system. A crystal may
also be used by removing the canned oscillator and jumpers J81, J95 and J11. The CDB5368 Evaluation
Board is shipped with 39 pF loading capacitors for crystal-based oscillators. Soldering pads are provided
on the board for users that require third overtone tank circuit operation or different loading capacitors.
Connect the power supply common to the GND binding post. Connect +5 V, +12 V and -12 V to the bind-
ing posts as marked on the board silkscreen.
The FlexGUI provides two convenient views of the CDB5368 Evaluation Board settings. The default view is
a high-level functional mapping of settings. The second view is a lower-level register map view for program-
ming at the bit level. Each view is synchronized with the other view, so that changing a setting at one level
will also change the corresponding setting in the alternate level.
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3.3 FlexGUI Hi-Level View
The Cirrus Logic FlexGUI defaults to the Hi-Level View as shown in Figure 1. This view provides functionally
grouped control over the CS5368, reducing the need to memorize the exact location of bit settings. Any reg-
ister may be modified at any time; however, the effect of changes made to the CS5368 is gated off until the
Control Port Bit is enabled.
When switching to TDM mode, the CS8406 Clock and Date source (Board Control Panel) must be changed
prior to changing the CS5368 SAI format. This sequential ordering resets the FPGA to assure that it timed
properly with the CS5368 TDM packet stream.
Figure 1. Hi-Level FlexGUI View
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3.4 FlexGUI Low-Level View
The Low-level Register Map view provides direct control over the CS5368, the FPGA and GPIO settings
that change the CS5368 device address. Select the desired device tab; then select and modify any write-
register values. Register modification is always a READ-WRITE-READ operation and is usable at both the
byte or bit level. For byte-level control, type the required hex value in the desired register field numerical
box. For bit-level control, click the corresponding graphical push-button in the desired register field or use
the pull-down menu to access and change the bit values.
Figure 2. FlexGUI Low-Level Register View
When the CS5368 is put in Control Port mode, the DIP switches are ignored and configuration is determined
by the register bits. When placed back in Stand-Alone mode, the DIP switches regain board control. Exiting
Control Port mode is achieved by stopping the FlexGUI program. Once the program is stopped, about three
seconds later, Stand-Alone mode is established.
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3.5 Bit Definitions
3.5.1 CS5368 Bits
The Low-Level view of the FlexGUI provides the full register set of the CS5368 under the CS5368 tab.
The CS5368 datasheet provides full details of internal register operation.
3.5.2 FPGA Bits
FPGA Register 0x00 is non-functional and only contains the revision code of the FPGA.
FPGA Register 0x01 is a functional register that provides the following functionality.
Figure 3. FPGA Low-Level Bit View
Fs_Range1,0 set the device Speed Mode. These bits need to be changed when using the Serial Audio
Interface of the DSP header to communicate with external equipment.
0x00 Single Speed Master
0x01 Double Speed Master
0x10 Quad Speed Master
0x11 Slave all speed
AudioFMT1,0 set the Serial Audio Interface format when attaching the Serial Audio Interface of the DSP
header to external equipment.
0x00 Left Justified
0x01 I²S
0x10 TDM 2-wire
0x11 TDM 4-wire
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In TDM mode, SDOUT_SEL1 and SDOUT_SEL 0 extract two stereo pairs from the CS5368 TDM stream,
convert the data to Left-Justified PCM format and send the data to the CS8406 data input pin.
0x00 TDM Pair 1 (Channel 1, 2)
0x01 TDM Pair 2 (Channel 3, 4)
0x10 TDM Pair 3 (Channel 5, 6)
0x11 TDM Pair 4 (Channel 7, 8)
In PCM mode, SDOUT_SEL1 and SDOUT_SEL 0 select which SDOUT pin of the CS5368 is sent to the
CS8406.
0x00 SDOUT1 (Channel 1, 2)
0x01 SDOUT2 (Channel 3, 4)
0x10 SDOUT3 (Channel 5, 6)
0x11 SDOUT4 (Channel 7, 8)
TDM2PCM/PCM selects the clock source for the CS8406.
0x00 8406 Clock Source is CS5368
0x01 8406 Clock Source is the FPGA TDM2PCM engine
4. CDB5368 HARDWARE
The CDB5368 Evaluation Board has a number of connections, switches and jumpers that provide ease and conve-
nience for quickly evaluating the most commonly used functions of the CS5368 silicon device. The following tables
list the purpose of each hardware option on the Evaluation Board.
4.1 Input and Output Connectors
The input and output connectors provide power and signal connectivity to the CDB5368 Evaluation Board
as shown in Table 1.
Table 1. CDB5368 Input and Output Connectors
DESIGNATOR NAME CLASS FUNCTION
J6 GND Ground Ground connection from power supply
J2 +5 V Power + 5 Volt power for CS5368
J16 +12 V Power +12 V power for the active input buffers
J17 -12 V Power -12 V power for the active input buffers
J18 AIN6 Analog Input Analog input channel 6
J19 AIN5 Analog Input Analog input channel 5
J20 AIN1 Analog Input Analog input channel 1
J21 AIN2 Analog Input Analog input channel 2
J22 AIN4 Analog Input Analog input channel 4
J23 AIN3 Analog Input Analog input channel 3
J24 AIN7 Analog Input Analog input channel 7
J25 AIN8 Analog Input Analog input channel 8
OPT1 Optical Output Digital Output S/PDIF Optical Digital audio output
J3 Coax Output Digital Output S/PDIF Coaxial Digital audio output
J5 RS232 I/O Digital I/O FlexGUI Interface port to PC
J10 USB I/O Digital I/O FlexGUI Interface port to PC
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4.2 Switches
The CDB5368 Evaluation Board switches are used for setting speed modes and format protocols and for
resetting devices to their default state. The switch functions are described in Table 2.
.
Table 2. CDB5368 Switches
4.3 User Configuration Jumpers
The CDB5368 Evaluation Board jumpers are used for signal routing as shown in Table 3
.
Table 3. User Jumpers
4.4 Reserved Factory Programming Jumpers
The CDB5368 Evaluation Board has two reserved headers, J15 and J8, that are used to factory program
the Cygnal® 8051 microprocessor and the Xilinx® FPGA so that the FlexGUI interface operates correctly.
Caution! Do not apply power or shorts to these two jumpers as device damage could occur.
.
Table 4. CDB5368 Reserved Jumpers
DESIGNATOR NAME FUNCTION (see CS5368 Datasheet for details)
S1-1 M0 speed mode; Master/Slave function
S1-2 M1 speed mode; Master/Slave function
S1-3 DIF0 Data Format
S1-4 DIF1 Data Format
S1-5 TDM0 Select Channel pairs for S/PDIF output
S1-6 TDM1 Select Channel pairs for S/PDIF output
S4-1 MDIV Master Clock Divider
S4-2 CLKMODE Master Clock Divider
S3 BOARD RESET Resets CS5368, CS8406 and FPGA
S2 PGM Forces FPGA to be loaded with new code (not needed by
user)
DESIGNATOR NAME FUNCTION
J7 CONTROL Select I²C control Source
J91 - Short to ground when not using Crystal
J85 - Short to ground when not using Crystal
J11 OSC/XTL Canned Oscillator/Crystal Selection
J9 +5 V/VA EXT VA source selector
J4 DSP HEADER
DESIGNATOR NAME FUNCTION
J15 MICRO_PROG Reserved interface for pre-programming the Evaluation Board
J8 JTAG Reserved interface for pre-programming the Evaluation Board
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4.5 Power Supply Circuitry
Power is applied to the evaluation board through five binding posts (+5 V, +12 V, -12 V, VA and GND). The
GND connection is the common reference for power supplies. The +5 V binding post supplies digital power
for all logic devices. The +12 V and -12 V binding posts supply power for the Operational Amplifier input
buffers. The VA binding posts supplies power to the Analog Reference.
4.6 Grounding and Power Supply Treatment
As a high-peformance mixed-signal device, the CS5368 requires careful attention to power and grounding
arrangements to optimize CS5368 performance. The CDB5368 Evaluation Board provides an excellent ref-
erence example of an optimum two-layer board layout that places decoupling capacitors as close to the
CS5368 as possible and provides ground plane fill on both top and bottom layers.
4.7 FPGA Hardware
The on-board FPGA is utilized for several purposes. In addition to providing a method for configuring the
CS5368 in Software mode, it contains its own configuration registers that provide clock and data routing for
Master and Slave modes of the CS5368. The FPGA contains a multiplexer that selects which SDOUT line
is routed to the CS8406. It also contains a TDM2PCM engine that extracts channel pairs from a TDM stream
and sends them to the CS8406.
4.8 CS8406 S/PDIF Audio Transmitter
The system generates standard S/PDIF data using a CS8406 192 kHz Digital Audio Transmitter. The
CS8406 receives input data from the FPGA in PCM format and transmits S/PDIF data on both optical and
coaxial output connectors. The optical output connector is limited to a maximum speed of 96 kHz. The co-
axial connector supports Quad Speed 192 kHz clocking rates.
4.9 Serial Audio Interface
In addition to the standard S/PDIF outputs, the Customer Evaluation Board has been designed to allow
Master and Slave operation using the Serial Audio Interface (SAI) via the 14-pin header, J4, which includes
the signals MCLK, SCLK, LRCK, and the four serial data lines.
When the CS5368 is in Slave mode, SCLK and LRCK/FS must be supplied externally through the J4 head-
er.
4.10 Analog Input Buffer
The CDB5368 includes an example of an active low-noise, single-ended-to-differential analog input buffer
shown in the schematic drawings, Figures 10 and 11. Alternate active or passive, single-ended or differen-
tial topologies may be used as cost dictates. However, the high performance of the CS5368 may be com-
promised. Optimum device performance is met by buffering the CS5368 with a low noise structure that is
stable with a 2700 pF output load.
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5. SCHEMATICS
Figure 4. CS5368 (Schematic page 1)
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Figure 5. Clock Generation (Schematic page 2)
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Figure 6. FPGA (Schematic page 3)
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Figure 7. Control Port (Schematic page 4)
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Figure 8. Clock and Data Buffers (Schematic page 5)
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Figure 9. CD8406 S/PDIF Output (Schematic page 6)
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Figure 10. Analog Inputs 1 to 4 (Schematic page 7)
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Figure 11. Analog Inputs 5 to 8 (Schematic page 8)
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Figure 12. Power (Schematic page 9)
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6. BOARD LAYOUT AND ROUTING PLOTS
Figure 13. Top Silkscreen
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Figure 14. Top Layer
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Figure 15. Bottom Layer
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7. REVISION HISTORY
Release Date Changes
DB1 September 2005 Initial Release
Contacting Cirrus Logic Support
For all product questions and inquiries contact a Cirrus Logic Sales Representative.
To find one nearest you go to <http://www.cirrus.com/corporate/contacts/sales.cfm>
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