CDB3308 CIRRUS | Alldatasheet
Document overview
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Technical content
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® 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. Eval- uation requires an analog signal source and analyzer, power supplies, and a Windows PC compatible computer. Standard RCA phono jacks are provided to easily inter- face external analog signals with the evaluation board. Each of the CS3308’s inputs and outputs may be inde- pendently AC or DC-coupled to their respective I/O connectors. The Windows software provides a GUI to make config- uration 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 exter- nal control signals for operation in a user application during system development. To facilitate multi-CS3308 system design efforts, head- ers are provided for connecting serial control signals between multiple CDB3308 evaluation boards.
ORDERING INFORMATION
MAY '06 DS702DB2
- 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 perfor- mance. 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 pro- vided 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/I²C® 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 I²C bus. The 10-pin, 2 column header, J89, provides bidirectional access to the CS3308’s I²C 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 be- tween 2 or more CDB3308’s (out of J89 on one and in to J17 on another) for multiple CS3308 I²C serial control evaluation.
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 filter- ing. 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 connec- tor, 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).
face 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. Download and install the FlexGUI software from www.cirrus.com/msasoftware. Connect the CDB3308 to a host PC using the supplied USB cable or a 9-pin serial cable. Apply positive power, negative power, and ground to the VA+, VA-, and GND binding posts respectively. Launch the FlexGUI software. The GUI will load and be displayed. Un-check the “Power Down CS3308” check box to allow audio to pass through the device. CS3308. Control over the state of the CS3308’s MUTE and RESET input pins is also provided. 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 ½ dB steps. See the CS3308 datasheet for complete internal register descriptions. Figure 1. CS3308 Controls Tab
entire register, simply enter the register’s new value directly into the register matrix. I²C and SPI. The CS3308 will be automatically reset when the communication protocol is changed. Figure 2. Register Maps Tab
- SYSTEM CONNECTIONS & JUMPERS
Positive analog power. +5 V. Negative analog power. -5 V. USB connection to PC for software control. Serial RS-232 connection to PC for software control. Connection for internal/external I²C/SPI control signals. Output connection for on-board I²C control signals. Output connection for on-board SPI control signals. Connection for programming the on-board microcontroller (U46). Table 1. System Connections Resets the on-board microcontroller (U46). Table 2. On-Board Switches tive input connector to the associated input of the CS3308. nector will be AC coupled to the associated input of the CS3308. tive output connector to the associated output of the CS3308. connector will be AC coupled to the associated output of the CS3308. Table 3. System Headers
Figure 7. Block Diagram
Figure 8. CS3308
Figure 9. Analog Inputs and Outputs
Figure 10. Serial Control / Power
Figure 11. Silkscreen Top
Figure 12. Top Side Copper Layer
Figure 13. Bottom Side Copper Layer
- REVISION HISTORY Release Changes DB1 Initial Release DB2 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 con- sent 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 PROP- ERTY 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 DE- VICES, LIFE SUPPORT PRODUCTS OR OTHER CRITICAL APPLICATIONS. INCLUSION OF CIRRUS PRODUCTS IN SUCH APPLICATIONS IS UNDER- STOOD 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. I²C is a registered trademark of Philips Semiconductor. Windows is a registered trademark of Microsoft Corporation.