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CDB3308
Evaluation Board for CS3308
Features
Single-ended Analog Inputs Single-ended Analog Outputs Supports AC and DC-Coupled Analog I/O Flexible Serial Control I/O Headers - Serial Control Input Header to Accommodate On-board and External Serial Controllers - Serial Control Output Headers for "Chaining" Serial Control Across Multiple CDB3308 Evaluation Boards - 3.3 V Logic Interface Level Demonstrates Recommended Layout and Grounding Arrangements Minimal Power Supply Requirements - 5 V and Ground Windows(R) Compatible Software Interface - Easy and Intuitive Graphical Interface to Channel and Master Volume Controls - Supports USB and RS-232 PC Connectivity
Description
The CDB3308 evaluation board is an excellent means for evaluating the CS3308 analog volume control. Evaluation requires an analog signal source and analyzer, power supplies, and a Windows PC compatible computer. Standard RCA phono jacks are provided to easily interface external analog signals with the evaluation board. Each of the CS3308's inputs and outputs may be independently AC or DC-coupled to their respective I/O connectors. The Windows software provides a GUI to make configuration of the CDB3308 easy. The software communicates through the PC's USB or Serial port to configure the control port registers so that all features of the CS3308 can be evaluated. As an alternative to the serial control provided via a PC, the evaluation board may be configured to accept external control signals for operation in a user application during system development. To facilitate multi-CS3308 system design efforts, headers are provided for connecting serial control signals between multiple CDB3308 evaluation boards. ORDERING INFORMATION CDB3308 Evaluation Board
CS3308
8-Channel Passive Inputs AC/DC Coupling 8-Channel Digitally Controlled Analog Volume Control AC/DC Coupling 8-Channel Passive Outputs
USB/RS232 PC Interface
PC or External Serial Control Input
External Serial Control Output
http://www.cirrus.com
Copyright (c) Cirrus Logic, Inc. 2006 (All Rights Reserved)
MAY '06 DS702DB2
CDB3308
TABLE OF CONTENTS
1. SYSTEM OVERVIEW ............................................................................................................................. 3 1.1 Power ............................................................................................................................................... 3 1.2 Grounding and Power Supply Decoupling ........................................................................................ 3 1.3 CS3308 Analog Volume Control ....................................................................................................... 3 1.4 External Control Headers ................................................................................................................. 3 1.5 Analog Inputs .................................................................................................................................... 4 1.6 Analog Outputs ................................................................................................................................. 4 1.7 PC Interfaces .................................................................................................................................... 4 2. PC SOFTWARE CONTROL ................................................................................................................... 5 2.1 CS3308 Controls Tab ....................................................................................................................... 5 2.2 Register Maps Tab ........................................................................................................................... 6 3. PERFORMANCE PLOTS ....................................................................................................................... 7 4. SYSTEM CONNECTIONS & JUMPERS ................................................................................................ 8 5. CDB BLOCK DIAGRAM ........................................................................................................................ 9 6. CDB SCHEMATICS .............................................................................................................................. 10 7. CDB LAYOUT ....................................................................................................................................... 13 8. REVISION HISTORY ............................................................................................................................ 16
LIST OF FIGURES
Figure 1.CS3308 Controls Tab ................................................................................................................... 5 Figure 2.Register Maps Tab ........................................................................................................................ 6 Figure 3.Frequency Response .................................................................................................................... 7 Figure 4.THD+N vs. Amplitude ................................................................................................................... 7 Figure 5.THD+N vs. Frequency .................................................................................................................. 7 Figure 6.Crosstalk ....................................................................................................................................... 7 Figure 7.Block Diagram ............................................................................................................................... 9 Figure 8.CS3308 ....................................................................................................................................... 10 Figure 9.Analog Inputs and Outputs ......................................................................................................... 11 Figure 10.Serial Control / Power ............................................................................................................... 12 Figure 11.Silkscreen Top .......................................................................................................................... 13 Figure 12.Top Side Copper Layer ............................................................................................................. 14 Figure 13.Bottom Side Copper Layer ........................................................................................................ 15
LIST OF TABLES
Table 1. System Connections ..................................................................................................................... 8 Table 2. On-Board Switches ....................................................................................................................... 8 Table 3. System Headers ............................................................................................................................ 8
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CDB3308 1. SYSTEM OVERVIEW
The CDB4265 evaluation board is an excellent means for evaluating the CS3308 digitally controlled analog volume control. Analog audio signal interfaces are provided, an on-board microcontroller and USB/RS-232 PC interface is used for easily configuring the CS3308's internal registers, and a USB cable is included for use with the FlexGUI Windows configuration software. The CDB3308 schematic set is shown in Figure 8 through Figure 10.
1.1
Power
Power (5 V) must be supplied to the evaluation board through the red VA+ and green VA- binding posts. An on-board regulator provides a 3.3 V supply to the digital circuitry. All voltage inputs must be referenced to the single black binding post ground connector (see the System Connections table on page 8). WARNING: Please refer to the CS3308 data sheet for allowable voltage levels.
1.2
Grounding and Power Supply Decoupling
The CS3308 requires careful attention to power supply and grounding arrangements to optimize performance. Figure 7 on page 9 provides an overview of the connections to the CS3308. Figure 11 on page 13 shows the component placement. Figure 12 on page 14 shows the top layout. Figure 13 on page 15 shows the bottom layout. The decoupling capacitors are located as close to the CS3308 as possible. Extensive use of ground plane fill in the evaluation board yields large reductions in radiated noise.
1.3
CS3308 Analog Volume Control
A complete description of the CS3308 is included in the CS3308 product data sheet. The required configuration settings of the CS3308 are achieved via its control port registers, accessible through the CS3308 tab of the Cirrus Logic FlexGUI software. A register-level configuration interface is provided on the Register Maps tab. See the "PC Software Control" section on page 5 for more information.
1.4
External Control Headers
The evaluation board has been designed to allow interfacing with external systems via the headers J17, J88, and J89. The 15-pin, 3 column header, J17, provides bidirectional access to the CS3308's SPITM/IC(R) and MUTE digital control signals. The pins located in the column labeled "PC" connect to the on-board PC interface circuitry, and those in the column labeled "In" connect directly to the CS3308's digital control I/O pins. By default, shunts are populated across these rows, connecting the PC interface to the CS3308's digital control I/O. To use an external digital control source, simply remove the shunts and connect a ribbon cable to the "In" position. A single "GND" column for the ribbon cable's ground connection is provided to maintain signal integrity. Two unpopulated pull-up resistors are also available should the CDB3308 be required to provide the pull-up function for the IC bus. The 10-pin, 2 column header, J89, provides bidirectional access to the CS3308's IC SDA and SCL signals, as well as unidirectional output access to the CS3308's AD0, ENOut, and MUTE signals. The SDA and SCL signals are connected directly to their corresponding pins on the CS3308, as well as those on J17 described above. The AD0, ENOut, and MUTE signals are re-driven versions of these signals as present directly on their respective I/O pins on the CS3308. This header may be used to connect the serial control signals between 2 or more CDB3308's (out of J89 on one and in to J17 on another) for multiple CS3308 IC serial control evaluation.
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CDB3308
The 10-pin, 2 column header, J88, provides unidirectional output access to the CS3308's SPI MOSI and CCLK signals, as well as its AD0, ENOut, and MUTE signals. All of the signals re-driven versions of those present directly on their respective I/O pins on the CS3308. This header may be used to connect the serial control signals between 2 or more CDB3308's (out of J88 on one and in to J17 on another) for multiple CS3308 SPI serial control evaluation.
1.5
Analog Inputs
RCA connectors supply the CS3308 analog inputs through single-ended passive circuits with no input filtering. Refer to the CS3308 data sheet for the maximum input signal level. Each analog input may be AC or DC coupled to its respective RCA connector. This selection is made via the 2-pin headers labeled "DC Couple Input" and placed adjacent to each input connector on the board. To DC couple an input connector, place a shunt across the respective header. To AC couple an input connector, remove the shunt from the respective header. By default, the input connectors are AC coupled to the CS3308's inputs.
1.6
Analog Outputs
The CS3308 analog outputs are routed through single-ended passive circuits with no output filtering and connected to RCA jacks for easy evaluation. Each analog output may be AC or DC coupled to its respective RCA connector. This selection is made via the 2-pin headers labeled "DC Couple Output" and placed adjacent to each output connector on the board. To DC couple an output connector, place a shunt across the respective header. To AC couple an output connector, remove the shunt from the respective header. By default, the output connectors are AC coupled to the CS3308's outputs.
1.7
PC Interfaces
USB and RS-232 connections are provided to facilitate software control of the CS3308's internal registers. A graphical user interface is available for the CDB3308 to allow easy manipulation of the CS3308's internal registers. See the CS3308 datasheet for complete internal register descriptions. To enable the CDB3308, simply connect the supplied USB cable from an available USB port on a PC to the USB connector (J37), or alternatively connect a 9-pin serial cable from an available COM port on a PC to the RS-232 connector (J42) and launch the Cirrus Logic FlexGUI software. Refer to "PC Software Control" on page 5 for a description of the Graphical User Interface (GUI).
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CDB3308 2. PC SOFTWARE CONTROL
The CDB3308 is designed for use with the Microsoft Windows based FlexGUI graphical user interface. This interface provides comprehensive control over the CS3308's internal registers via a PC's USB or RS-232 port. The FlexGUI software may be downloaded and installed from www.cirrus.com/msasoftware. Step-by-step instructions for using the FlexGUI are provided as follows: 1. Download and install the FlexGUI software from www.cirrus.com/msasoftware. 2. Connect the CDB3308 to a host PC using the supplied USB cable or a 9-pin serial cable. 3. Apply positive power, negative power, and ground to the VA+, VA-, and GND binding posts respectively. 4. Launch the FlexGUI software. The GUI will load and be displayed. 5. Un-check the "Power Down CS3308" check box to allow audio to pass through the device.
2.1
CS3308 Controls Tab
The CS3308 Controls tab provides a high-level intuitive interface to many of the configuration options of the CS3308. Control over the state of the CS3308's MUTE and RESET input pins is also provided.
Figure 1. CS3308 Controls Tab
The Master X Mask check boxes are used to map each channel to the master controls. These check-boxes reflect the state of their associated Master X Mask bits; when checked, the channel is un-masked. The sliders facilitate control over the Ch X Volume registers, providing gain and attenuation in 1/2 dB steps. The +1/4 dB Gain check boxes are used to add an additional 1/4 dB of gain to the volume level displayed for each channel. See the CS3308 datasheet for complete internal register descriptions. DS702DB2 5
CDB3308
2.2 Register Maps Tab
The Register Maps tab provides an easy register-level interface to the on-board devices. Register values can be modified on a bit-wise or byte-wise basis. To modify a single bit, first select the register by clicking its position in the register matrix, then click the appropriate push-button for the desired bit. To modify an entire register, simply enter the register's new value directly into the register matrix. Within the Register Maps tab, the CS3308 tab is used to access the CS3308's internal registers, and the GPIO tab is used to access the on-board microcontroller outputs used to control the CS3308's MUTE input and default IC address.
Figure 2. Register Maps Tab
The Comm Mode Select box may be used to change the CS3308's serial communication protocol between IC and SPI. The CS3308 will be automatically reset when the communication protocol is changed. The software is only capable of addressing the CS3308 at its default address. If the CS3308's individual address is changed, the software will loose communication with the device until it is reset, thereby returning to its default address. See the CS3308 datasheet for more information about the device's individual address.
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CDB3308 3. PERFORMANCE PLOTS
(TA = +25 C, VA+ = +5 V, VA- = -5 V, VD = +3.3 V, RL = 100 k, CL = 20 pF, VIN = 2 VRMS, FIN = 1 kHz, Gain = 0 dB, Measurement Bandwidth = 20 Hz to 20 kHz, unless otherwise noted.)
+1 +0.9
1
0.5 +0.8 +0.7 0.2 +0.6 +0.5 +0.4 0.05 +0.3 +0.2 0.02 d B r A +0.1 +0 -0.1 0.005 -0.2 -0.3 0.002 -0.4 -0.5 -0.6 0.0005 -0.7 -0.8 0.0002 -0.9 -1 20 0.0001 100m 0.001 % 0.01 0.1
50
100
200
500
1k
2k Hz
5k
10k
20k
50k
100k
200k
200m
300m
400m
500m
600m 700m 800m900m 1
2
3
Vrms
Figure 3. Frequency Response
Figure 4. THD+N vs. Amplitude
1
+0 -10 -20
0.5
0.2
-30 -40
0.1 -50 0.05 -60 -70 0.02 d B r A 0.005 -80 -90 -100 -110 0.002 -120 -130 0.001 -140 0.0005 -150 -160 0.0002 -170 0.0001 20 -180 20
%
0.01
50
100
200
500 Hz
1k
2k
5k
10k
20k
50
100
200
500 Hz
1k
2k
5k
10k
20k
Figure 5. THD+N vs. Frequency
Figure 6. Crosstalk
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CDB3308 4. SYSTEM CONNECTIONS & JUMPERS
Connector Name
GND VA+ VAIn 1 In 2 In 3 In 4 In 5 In 6 In 7 In 8 Out 1 Out 2 Out 3 Out 4 Out 5 Out 6 Out 7 Out 8 USB I/O RS-232 I/O IC/SPI Input IC Output SPI Output C2
Reference Designator
J5 J8 J7 J29 J27 J11 J15 J55 J57 J71 J73 J19 J21 J46 J48 J62 J64 J79 J81 J37 J42 J17 J89 J88 J36
Signal Direction
Input Input Input
Connector Function
Ground reference. Positive analog power. +5 V. Negative analog power. -5 V.
Input
Analog input to CS3308.
Output
Analog output from CS3308.
Input/Output Input/Output Input/Output Output Output Input/Output
USB connection to PC for software control. Serial RS-232 connection to PC for software control. Connection for internal/external IC/SPI control signals. Output connection for on-board IC control signals. Output connection for on-board SPI control signals. Connection for programming the on-board microcontroller (U46). Table 1. System Connections
Switch Name
uC Reset
Reference Designator
J5 Table 2. On-Board Switches
Switch Function
Resets the on-board microcontroller (U46).
Connector Name
DC Couple Input 1 DC Couple Input 2 DC Couple Input 3 DC Couple Input 4 DC Couple Input 5 DC Couple Input 6 DC Couple Input 7 DC Couple Input 8 DC Couple Output 1 DC Couple Output 2 DC Couple Output 3 DC Couple Output 4 DC Couple Output 5 DC Couple Output 6 DC Couple Output 7 DC Couple Output 8
Reference Designator
J2 J3 J16 J18 J58 J59 J74 J75 J32 J33 J51 J52 J67 J68 J84 J85
Header Function
When a shunt is present across its pins, each header DC couples its respective input connector to the associated input of the CS3308. When no shunt is present across the header's pins, its respective input connector will be AC coupled to the associated input of the CS3308.
When a shunt is present across its pins, each header DC couples its respective output connector to the associated output of the CS3308. When no shunt is present across the header's pins, its respective output connector will be AC coupled to the associated output of the CS3308.
Table 3. System Headers
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5. CDB BLOCK DIAGRAM
CS3308
AC/DC Coupling 8-Channel Digitally Controlled Analog Volume Control AC/DC Coupling 8-Channel Passive Outputs
8-Channel Passive Inputs
USB/RS232 PC Interface
PC or External Serial Control Input
External Serial Control Output
CDB3308
Figure 7. Block Diagram
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CDB3308 6. CDB SCHEMATICS
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Schematic Page 1
Figure 8. CS3308
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Figure 9. Analog Inputs and Outputs Schematic Page 2
CDB3308
11
12
Figure 10. Serial Control / Power Schematic Page 3
CDB3308
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CDB3308
5V
7. CDB LAYOUT
CDB3308
Figure 11. Silkscreen Top
13
14
CDB3308
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Figure 12. Top Side Copper Layer
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CDB3308
Figure 13. Bottom Side Copper Layer
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CDB3308 8. REVISION HISTORY
Release
DB1 DB2
Changes
Initial Release Updated performance plots shown in Figures 3 - 6 on page 7.
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, and the Cirrus Logic logo designs 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. SPI is a trademark of Motorola, Inc. IC is a registered trademark of Philips Semiconductor. Windows is a registered trademark of Microsoft Corporation.
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