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CDB4350 Evaluation Board for CS4350
Features
No High Frequency Master Clock Required Stand-Alone or PC GUI Board Control CS8416 Receives S/PDIF-Compatible Digital Audio Headers for External PCM Audio Input Demonstrates Recommended Layout and Grounding Arrangements. Requires Only a Digital Signal Source and Power Supplies for a Complete Digital-toAnalog Converter System
Description
The CDB4350 evaluation board is an excellent platform for quickly evaluating the CS4350 24-bit, 24-pin, stereo D/A converter. Evaluation requires an analog signal analyzer, a digital signal source, a PC for controlling the CS4350 (only required for Control Port Mode), and a power supply. Analog line-level outputs are provided via RCA phono jacks. The CS8416 digital audio receiver IC provides the system timing necessary to operate the digital-to-analog converter and will accept S/PDIF-compatible audio data. The evaluation board may also be configured to accept external timing and data signals for operation in a user application during system development. ORDERING INFORMATION CDB4350
Evaluation Board
Hardware or Software Board Control
Inputs for PCM Clocks and Data CS4350 CS8416 Digital Audio Interface
Analog Outputs and Filtering
Recovered Master Clock
http://www.cirrus.com
Copyright (c) Cirrus Logic, Inc. 2006 (All Rights Reserved)
APRIL '06 DS691DB1
CDB4350
TABLE OF CONTENTS
1. CDB4350 SYSTEM OVERVIEW ............................................................................................................ 3 2. CS4350 DIGITAL-TO-ANALOG CONVERTER ..................................................................................... 3 3. CS8416 DIGITAL AUDIO RECEIVER .................................................................................................... 3 4. INPUT FOR CLOCKS AND DATA ......................................................................................................... 3 5. INPUT FOR CONTROL DATA ............................................................................................................... 3 6. POWER SUPPLY CIRCUITRY ............................................................................................................... 4 7. GROUNDING AND POWER SUPPLY DECOUPLING .......................................................................... 4 8. ANALOG OUTPUT FILTERING ............................................................................................................. 4 9. BOARD CONNECTIONS AND SETTINGS ............................................................................................ 5 10. SCHEMATICS ...................................................................................................................................... 6 11. LAYOUT ............................................................................................................................................. 13 12. REVISION HISTORY .......................................................................................................................... 16
LIST OF FIGURES
Figure 1.System Block Diagram and Signal Flow ....................................................................................... 6 Figure 2.CS4350 ......................................................................................................................................... 7 Figure 3.Analog Outputs ............................................................................................................................. 8 Figure 4.PCM Input Header and Hardware Control .................................................................................... 9 Figure 5.CS8416 S/PDIF Input ................................................................................................................. 10 Figure 6.Control Port ................................................................................................................................. 11 Figure 7.Power .......................................................................................................................................... 12 Figure 8.Silkscreen Top ............................................................................................................................ 13 Figure 9.Top Side ...................................................................................................................................... 14 Figure 10.Bottom Side .............................................................................................................................. 15
LIST OF TABLES
Table 1. System Connections ..................................................................................................................... 5 Table 2. CDB4350 Jumper Settings ............................................................................................................ 5 Table 3. CDB4350 Switch Settings ............................................................................................................. 5
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CDB4350 1. CDB4350 SYSTEM OVERVIEW
The CDB4350 evaluation board is an excellent platform for quickly evaluating the CS4350. 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 clocks and data through headers for system development. The CDB4350 schematic has been partitioned into 6 pages, shown in Figures 2 through 7. Each schematic page is represented in the system diagram shown in Figure 1. Notice that the system diagram also includes the interconnections between the partitioned schematics.
2. CS4350 DIGITAL-TO-ANALOG CONVERTER
A description of the CS4350 is included in the CS4350 datasheet, available at www.cirrus.com.
3. 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, and a left-right clock. The CS8416 data format is selected through switch S1. The operation of the CS8416 and a discussion of the digital audio interface is included in the CS8416 datasheet, available at www.cirrus.com. The CDB4350 has been designed so that the input can be either optical or coaxial (see Figure 6). However, both inputs cannot be driven simultaneously. After the CS8416 serial format is changed either through S1 in Stand-Alone Mode, or though the CDB4350 GUI in PC Mode, a reset is required. The CS8416 can be manually reset using `HARDWARE RESET' (S2) in Stand-Alone Mode, or through software when operating the CDB4350 in PC Mode.
4. INPUT FOR CLOCKS AND DATA
The evaluation board has been designed to allow external PCM data input through header J10. The schematic for the clock/data input is shown in Figure 4. In Stand-Alone Mode, switch position 6 of S4 selects the source as either CS8416 (open) or header J10 (closed). In PC Mode, the PCM source is selected through software.
5. INPUT FOR CONTROL DATA
The evaluation board can be run in either a Stand-Alone Mode or with a PC. Stand-Alone Mode does not require the use of a PC, and the mode pins are configured using switch positions 1 through 5 of S4 and switch positions 1 and 2 of S1. PC Mode uses software to set up the CS4350 through IC(R) or SPITM using the PC's serial port or USB port. When the serial port (RS232) or USB is attached and the CDB4350 software is running, PC Mode is automatically selected. Header J38 offers the option for external input of RST and SPI/IC clocks and data. The board is set up from the factory to use the on-board microcontroller in conjunction with software available at www.cirrus.com. To use an external control source, remove the shunts on J38 and place a ribbon cable so the signal lines are on the center row and the grounds are on the right side. R89 and R90 should be populated with 2 k resistors when using an external IC source which does not already provide pull-ups.
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CDB4350 6. POWER SUPPLY CIRCUITRY
Power is supplied to the evaluation board by three binding posts (GND, +12V, and -12V), as shown in Figure 7. The `+12V' and `-12V' terminals supply the active output filters. The +3.3 V and +5.0 V circuitry is powered by regulators fed by the `+12V' terminal. Headers J3, J4, and J7 allow the user to either select +3.3 V or +5.0 V supplies for the various CS4350 voltage supply pins. Alternatively, the user can remove the shunts on J3, J4, and J7, and provide an external power supply. WARNING: Refer to the CS4350 datasheet for maximum allowable voltage levels. Operation outside of this range can cause permanent damage to the device.
7. GROUNDING AND POWER SUPPLY DECOUPLING
As with any high-performance converter, the CS4350 requires careful attention to power supply and grounding arrangements in order to optimize performance. Figure 2 details the connections to the CS4350 while Figures 8, 9, and 10 show the component placement and top and bottom layout. The decoupling capacitors are located as close to the CS4350 as possible. Extensive use of ground plane fill in the evaluation board yields large reductions in radiated noise.
8. ANALOG OUTPUT FILTERING
The analog output on the CDB4350 has been designed according to the CS4350 datasheet. This output circuit includes an active 2-pole, 50 kHz filter which utilizes the multiple-feedback topology and a passive output filter.
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CDB4350 9. BOARD CONNECTIONS AND SETTINGS
Board connections and settings are shown in Table 1, Table 2, and Table 3.
CONNECTOR
GND +12V -12V S/PDIF IN - J1 S/PDIF IN - OPT1 PCM INPUT - J10 AOUTA, AOUTB POUTA, POUTB
INPUT/OUTPUT
Input Input Input Input Input Input Output Output
SIGNAL PRESENT
Ground connection from power supply +12 V positive supply for the on-board filtering -12 V negative supply for the on-board filtering Digital audio interface input via coax Digital audio interface input via optical Input for master, serial, left/right clocks and serial data RCA line level analog outputs from active output stage RCA line level analog outputs from passive output stage
Table 1. System Connections
JUMPER
J6, J21 J3, J4, J7 J38 J27
PURPOSE
Selects analog output Selects Supply Voltage for CS4350 Selects source of control data C2 micro programming
POSITION
*A P +5V *+3.3V *PC CONTROL shunts removed -
FUNCTION SELECTED
*CDB4350 outputs from AOUTA and AOUTB CDB4350 outputs from POUTA and POUTB Supplies +5.0 V to associated CS4350 supply *Supplies +3.3 V to associated CS4350 supply *Control from PC and on-board microcontroller External control input using center and right columns Reserved for factory use only
Table 2. CDB4350 Jumper Settings
*Default Factory Settings. SWITCH (Note 1)
S2 S1
PURPOSE
Resets CS8416 and CS4350 CS8416 Format Select SFSEL[1:0] CS4350 Format Select DIF[2:0] CS4350 De-emphasis Select
POSITION
FUNCTION SELECTED
The CS8416 must be reset if switch S1 is changed Default: SFSEL[1:0] = 00 (Closed). See CS8416 datasheet for details. Default: DIF[2:0] = 000 (Closed). See CS4350 datasheet for details. open = De-emphasis enabled *closed = De-emphasis disabled. open = Popguard enabled *closed = Popguard disabled. *open = CS8416 closed = PCM Header J10
1,2 1,2, 3 4 5 6
S4 CS4350 Popguard Enable Selects PCM source for CS4350
Table 3. CDB4350 Switch Settings
*Default Factory Settings. Note: 1. Switch settings take effect in Stand-Alone Mode only.
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10.SCHEMATICS
Power
Serial Control Port
Figure 6 Figure 7
PCM source select
I2C/SPI Header
Analog Outputs
PCM HEADER
POUTA
PCM Clocks/Data
Figure 3
Figure 4
2 PCM mux
PCM Clocks/Data DIF[2:0] PCM Clocks/Data
AOUTA
Figure 3
CS4350
Figure 2
2
AOUTB
Figure 3
CS8416 S/PDIF Input
CS8416 serial port format
Figure 4
POUTB
Figure 3
PCM source select
Figure 5
RMCK Header
Figure 4
Hardware Control Switches
Figure 4
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Figure 1. System Block Diagram and Signal Flow
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Figure 3. Analog Outputs
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Figure 4. PCM Input Header and Hardware Control 9
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Figure 5. CS8416 S/PDIF Input
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Figure 6. Control Port 11
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Figure 7. Power
11.LAYOUT
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Figure 8. Silkscreen Top
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Figure 9. Top Side
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Figure 10. Bottom Side
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CDB4350 12.REVISION HISTORY
Release DB1 Date
April 2006
Changes Initial Evaluation Board Datasheet Release
Contacting Cirrus Logic Support
For all product questions and inquiries, contact a Cirrus Logic Sales Representative. To find the one nearest to you, go to www.cirrus.com
IMPORTANT NOTICE Cirrus Logic, Inc. and its subsidiaries ("Cirrus") believe that the information contained in this document is accurate and reliable. However, the information is subject to change without notice and is provided "AS IS" without warranty of any kind (express or implied). Customers are advised to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgment, including those pertaining to warranty, indemnification, and limitation of liability. No responsibility is assumed by Cirrus for the use of this information, including use of this information as the basis for manufacture or sale of any items, or for infringement of patents or other rights of third parties. This document is the property of Cirrus and by furnishing this information, Cirrus grants no license, express or implied under any patents, mask work rights, copyrights, trademarks, trade secrets or other intellectual property rights. Cirrus owns the copyrights associated with the information contained herein and gives consent for copies to be made of the information only for use within your organization with respect to Cirrus integrated circuits or other products of Cirrus. This consent does not extend to other copying such as copying for general distribution, advertising or promotional purposes, or for creating any work for resale. CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE ("CRITICAL APPLICATIONS"). CIRRUS PRODUCTS ARE NOT DESIGNED, AUTHORIZED OR WARRANTED FOR USE IN AIRCRAFT SYSTEMS, MILITARY APPLICATIONS, PRODUCTS SURGICALLY IMPLANTED INTO THE BODY, AUTOMOTIVE SAFETY OR SECURITY DEVICES, LIFE SUPPORT PRODUCTS OR OTHER CRITICAL APPLICATIONS. INCLUSION OF CIRRUS PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO BE FULLY AT THE CUSTOMER'S RISK AND CIRRUS DISCLAIMS AND MAKES NO WARRANTY, EXPRESS, STATUTORY OR IMPLIED, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR PARTICULAR PURPOSE, WITH REGARD TO ANY CIRRUS PRODUCT THAT IS USED IN SUCH A MANNER. IF THE CUSTOMER OR CUSTOMER'S CUSTOMER USES OR PERMITS THE USE OF CIRRUS PRODUCTS IN CRITICAL APPLICATIONS, CUSTOMER AGREES, BY SUCH USE, TO FULLY INDEMNIFY CIRRUS, ITS OFFICERS, DIRECTORS, EMPLOYEES, DISTRIBUTORS AND OTHER AGENTS FROM ANY AND ALL LIABILITY, INCLUDING ATTORNEYS' FEES AND COSTS, THAT MAY RESULT FROM OR ARISE IN CONNECTION WITH THESE USES. Cirrus Logic, Cirrus, the Cirrus Logic logo designs, and Popguard are trademarks of Cirrus Logic, Inc. All other brand and product names in this document may be trademarks or service marks of their respective owners. IC is a registered trademark of Philips Semiconductor. SPI is a trademark of Motorola, Inc.
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