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CDB4812
Evaluation Board for CS4812
Features
l Evaluation
Description
The CDB4812 is a stand-alone demonstration platform for the CS4812 multi-effects processor system-on-achip. The board is designed to showcase musical effects processing applications including spring reverb, digital reverb, delay, chorus, flange, and tremolo effects. The on-board microcontroller allows the user to change parameters on the DSP in real-time. Also, a PC GUI, connected from a PC parallel port, can be used for more thorough control of the DSP's parameters. Parameter levels are shown with LED rings around the rotary encoders which are used for parameter and preset control. The user can select from 16 factory presets, and store up to 6 user presets. All presets are stored by the microcontroller in an external serial EEPROM.
Platform for the CS4812 Single Chip Multi-Effects Processor l DSP Boots from on-board microcontroller or from PC l Selection of up to 6 User Presets l Selection of 16 different Factory Presets l Real-time adjustable parameter control l On-Board Hardware Wet/Dry Mix Control l User Adjustable Input and Output Gain
ORDERING INFORMATION CDB4812
Preliminary Product Information
P.O. Box 17847, Austin, Texas 78760 (512) 445 7222 FAX: (512) 445 7581 http://www.cirrus.com
This document contains information for a new product. Cirrus Logic reserves the right to modify this product without notice.
Copyright (c) Cirrus Logic, Inc. 2001 (All Rights Reserved)
MAR `01 DS291ADB1 1
CDB4812
TABLE OF CONTENTS
CDB4812 SYSTEM OVERVIEW .............................................................................................. 5 DIGITAL SIGNAL PROCESSOR ............................................................................................. 5 ANALOG INPUT ....................................................................................................................... 5 ANALOG OUTPUT ................................................................................................................... 5 CONTROL ................................................................................................................................. 5 POWER SUPPLY .................................................................................................................... 6 LAYOUT NOTES ...................................................................................................................... 6 CDB4812 BILL OF MATERIALS ........................................................................................... 10 APPENDIX A: MICROCONTROLLER FIRMWARE UPGRADES ......................................... 14 9.1 What's Needed for Microcontroller Programming ............................................................ 14 9.2 Programming Procedure .................................................................................................. 14 10. APPENDIX B: FACTORY PRESET DEFAULT SETTINGS ................................................. 15 11. APPENDIX C: CONFIGURING THE CDB4812 FOR PC GUI CONTROL ........................... 16 1. 2. 3. 4. 5. 6. 7. 8. 9.
LIST OF FIGURES
Figure 1. DSP Schematic ................................................................................................................ 5 Figure 2. Microcontroller Schematic................................................................................................ 6 Figure 3. Rotary Encoder/LED Ring Schematic .............................................................................. 7
Contacting Cirrus Logic Support
For a complete listing of Direct Sales, Distributor, and Sales Representative contacts, visit the Cirrus Logic web site at: http://www.cirrus.com/corporate/contacts/sales.cfm
Preliminary product information describes products which are in production, but for which full characterization data is not yet available. Advance product information describes products which are in development and subject to development changes. Cirrus Logic, Inc. has made best efforts to ensure 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, patent infringement, and limitation of liability. No responsibility is assumed by Cirrus Logic, Inc. for the use of this information, including use of this information as the basis for manufacture or sale of any items, nor for infringements of patents or other rights of third parties. This document is the property of Cirrus Logic, Inc. and by furnishing this information, Cirrus Logic, Inc. grants no license, express or implied under any patents, mask work rights, copyrights, trademarks, trade secrets or other intellectual property rights of Cirrus Logic, Inc. Cirrus Logic, Inc., copyright owner of the information contained herein, gives consent for copies to be made of the information only for use within your organization with respect to Cirrus Logic integrated circuits or other parts of Cirrus Logic, Inc. The same consent is given for similar information contained on any Cirrus Logic website or disk. 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. The names of products of Cirrus Logic, Inc. or other vendors and suppliers appearing in this document may be trademarks or service marks of their respective owners which may be registered in some jurisdictions. A list of Cirrus Logic, Inc. trademarks and service marks can be found at http://www.cirrus.com.
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CDB4812
1. CDB4812 SYSTEM OVERVIEW
The CDB4812 is a complete, stand-alone digital signal processing (DSP) system based on the CS4812 fixed function, multi-effects audio processor. The CS4812 contains an on-chip analog-todigital converter (ADC), digital-to-analog converter (DAC), and fixed function DSP core with a large amount of on-chip RAM. The DSP functionality (changing effects) is controlled during runtime by an on-board microcontroller. An analog audio mixer adds the processed signal to the input so that the user can vary the amount of the effect applied at the output. The user can also set the gain of the analog input and output to optimize the interface with linelevel audio equipment. gram of Figure 1 on page 5. The ADC input is protected against overvoltage by diodes D1 and D2.
4. ANALOG OUTPUT
The processed output signal is mixed with the amplified input signal with potentiometer VR5 (Mix). Turning Mix clockwise increases the amount of the processed (wet) signal that appears at the output. The mixed output is then buffered with an output stage that has a variable gain of -60 to +6 dB adjusted via 12-turn potentiometer VR4 (Out Gain Adj). Turning the Out Gain Adj clockwise increases the output gain. The best signal-to-noise ratio is obtained when the full scale output of the CDB4812 matches the full scale (non-clipped) amplitude capabilities of the downstream circuitry (ideally 5 V p-p or 1.77 V RMS). The noise floor will increase when the gain of the output buffer is greater than one. The differential analog output from the CS4812 DAC is buffered with a 2-pole active butterworth filter U2A, Fc = 16 kHz, Av = 0.83 V/V. The purpose of the filter is to convert the output to single ended prior to mixing, attenuate out-of-band noise generated by the DAC, and limit the signal swing to 5 V p-p. Q3 acts as a shunt to attenuate any voltage transients that may occur during power up/down. Q3 is controlled by a digital output pin (PIO3) on the CS4812 that is asserted at power-up and de-asserted after the DSP has booted.
2. DIGITAL SIGNAL PROCESSOR
The DSP program is loaded from the microcontroller at reset (or from the PC GUI). In this application, the micro control port uses SPI control format to communicate with the DSP. All of the various parameters that can be controlled during run-time are messaged into the DSP from the host microcontroller (or PC). The CS4812 Data Sheet and its associated application note, AN195, have details on the DSP and the guitar effects application code. Other codes may become available, please check the Cirrus Logic web site (http://www.cirrus.com) for availability.
3. ANALOG INPUT
The analog input to the on-chip ADC (J1/AIN) is single-ended, with an adjustable voltage gain of -60 to +26 dB. Adjusting the 12-turn Input Gain Adj potentiometer VR1 clockwise will increase the input gain. For best signal-to-noise performance the input gain should be increased until just before audible clipping is encountered with a maximum level input signal. The full scale input of the ADC (driven single-ended) is 1.77V RMS (5 V p-p). The ADC input signal is anti-aliased with a passive filter, Fc = 480 kHz, as shown in the schematic diaDS291ADB1
5. CONTROL
When using the CDB4812 without PC control, the microcontroller on the board will be monitoring the rotary encoders and switches for any input from the user. If the select knob is rotated or a user preset switch is selected, this preset is retrieved from EEPROM and then sent to the DSP. If the user has turned a parameter encoder (the Time, Regen, Speed, Depth, and Select knobs), the microcontrol3
CDB4812
ler will examine which parameter on the DSP needs to be changed, and send the updated value to the DSP. "APPENDIX B: FACTORY PRESET DEFAULT SETTINGS" ON PAGE 13 details in tabular form how the various encoders map to the factory presets default values. The microcontroller then updates the LED ring around the appropriate encoder to update the user of a change in value. The user preset buttons can be used to store presets into the EEPROM on the CDB4812. After the desired preset and dial values are selected, holding down a user preset button for 5 seconds will save the current effects setup. This setup can be recalled by pressing the same user preset button. The board will indicate when the preset is saved by briefly flashing the LED ring around the Select Dial. The DSP on this board can also be controlled with a PC parallel port. A Graphical User Interface (GUI) program for the PC is used to change parameters in the DSP. The GUI can access all of the parameters available on the DSP, whereas the onboard controls can only access 4 parameters at a time. Details on how to configure the board for PC parallel port control are contained in "APPENDIX C: CONFIGURING THE CDB4812 FOR PC GUI CONTROL" ON PAGE 14. An on-board voltage regulator supplies 200 mA@5 V to the system from an 8 to 12 VDC input. An external power resistor can be used to limit the input voltage to the board in applications where a 12 V supply is not available.
7. LAYOUT NOTES
The reference filter capacitors C32 and C37 must be kept as close as practical to the device, the CMFILT+ signal trace (pin 93) and CMFILT- ground return trace (pin 94) should be on the top side of the board and as short as possible. Keep other traces away from this node, as any noise coupled into the CMFILT+ pin will appear at the DAC outputs with little or no attenuation. Mount the 0.047 uf surface mount power supply decoupling capacitors as close to the device as possible. Again, keep the traces to these capacitors and the device supply pins and ground pins on the top side of the board and as short as practical. The anti-aliasing filter capacitors for the ADC should be mounted as close to the device as practical. The AC shorting capacitors on the ADC input should also be close to the device. All digital traces should be kept away from the analog input and output sections of the board. A ground fill is used on both top and bottom layers to minimize noise coupling and ground trace impedance. Separate analog and digital grounds are not needed and should not be used.
6. POWER SUPPLY
Power is attached to the board through a 2.5 mm power connector JP7, positive is the center contact. An unregulated 9 VDC, 0.5 A wall transformer is supplied with the board.
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CDB4812
Figure 1. DSP Schematic 5
6
CDB4812
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Figure 2. Microcontroller
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CDB4812
Figure 3. Rotary Encoder/LED Ring Schematic 7
8 DS291ADB1
8. CDB4812 BILL OF MATERIALS
Item Qty
1 2 3 4 5 6 7 4 1 1 7 4 12 38 J1-4 JP7 C22 C31 C50 C54 C56 C64-65 C73 C6 C20 C25-26 C13-14 C75-84
Reference
Value
Manufacturer
Part Number
ARJ-2018-1 PJ-202A
Description
RCA Jack - Right Angle, Gold Plated Connector, DC Power Jack
PCB Decal
ARJ-2018-1 CON_PJ202A CSN_0805 CSN_0805 CSN_0805 CSN_0805 CSN_0805
ARJ-2018- A/D Electronics 1 PJ-202A 1000pF 1000pF 39pF 0.01uF Cui Stack Kemet Kemet Kemet Kemet Kemet
C0805C102J5GAC CAP, 1000pF, COG, 0805, 50V, 5% C0805C102K5GAC CAP, 1000pF, COG, 0805, 50V, 10% C0805C390J5GAC CAP, 39PF, COG, 0805, 50V, 5% C0805C103K5RAC CAP, 0.01UF, X7R, 0805, 50V, 10% C0805C104K5RAC CAP, 0.1UF, X7R, 0805, 50V, 10%
C1 C3-4 C7-9 C12 .1uF C15 C17 C19 C23-24 C27-28 C32-34 C36 C38-39 C41-42 C47 C51-52 C55 C57-61 C66-72 C35 C43-45 C11 C10 C18 C5 C29 C37 1uf 0.033UF 33pF 1uF
8 9 10 11 12
4 1 2 3 12
Kemet Kemet Kemet Panasonic Panasonic
C0805C105K8RAC CAP, 1UF, X7R, 0805, 10V, 10% C0805C333J5RAC CAP, 0.033UF, X7R, 0805, 50V, 5% C1206C330J5GAC CAP, 33PF, COG, 1206, 50V, 5% ECE-V1HA010R ECE-V1EA100P CAP, 1uF, ELEC, VA Series, SMT Case-B, 50V, 20%
CSN_0805 CSN_0805 CSN_1206 CSP_ELEC _170SQ
C2 C16 C21 C30 C40 10uF C46 C48-49 C53 C62-63 C74 JP3 JP9 JP1-2 JP8 JP4-5 JP6 L1 D12 BEAD AMBER HDR2X1 DB25-M
CAP, 10uF, Elec, VA Series, SMT Case- CSP_ELEC C, 25V, 20% _208SQ Conn, DB25, Male Pins, Rt. Angle Header, 2X1, .1"CTRS, .025"SQ Pins Stake Header, 0.1" CTRS, 3X1 Stake Header, .1 CTRS, 4X2 Stake Header, 5X2, .1" Center, Gold Ferrite Bead, 1806 LED, SMT 3216, Amber DB25M-RA HDR2X1 HDR3 HDR4X2
13 14 15 16 17 18 19 20
1 1 2 1 2 1 1 1
Adam Tech Adam Tech Samtec Samtec Samtec Samtec Panasonic Panasonic
DB25-PL-24 DE09-SL-24 TSW-102-07-G-S TSW-103-07-G-S TSW-104-07-G-D TSW-105-07-G-D EXC-ML45A910U LN1451C
Conn, DE9, Female Sockets, Rt. Angle DE9F-RA
CDB4812
HDR5X2 IND_1806 LED_PANA 3216
9 DS291ADB1
Item Qty
21 22 23 24 25 26 27 28 51 1 5 2 2 1 1 1
Reference
D3 D6 D10 D13-60 D11 S5-9 VR3-4 VR1-2 VR5 U8 U9
Value
GREEN RED EVQVEC 20K 500K 20K CS4812KM
Manufacturer
Panasonic Panasonic Panasonic Bourns Bourns Panasonic Crystal Semi
Part Number
LN1351C LN1251C EVQ-VECF0224B 3266W-203 3266W-504 EVJ-Y91F03B203 CS4812-KM
Description
LED, SMT 3216, Green LED, SMT 3216, Red
PCB Decal
LED_PANA 3216 LED_PANA 3216
Encoder, 24 Pulse, Vertical, No Bushing PANAEVQVEC Pot, 20K, LIN, 10TURN, TOP-ADJ, TH POT-BRNS3266W Pot, 500K, LIN, 10TURN, TOP-ADJ, TH POT-BRNS3266W Pot, Dual, LIN, 1TURN, 20K POT-PANAEVJY9
Stereo DSP / CODEC, QFP100-14X20 QFP10014X20 QFP4410X10 RES_0805 RES_0805 RES_0805
MC68HC9 Motorola 08GP32CF B 0 1K Dale Dale Dale
MC68HC908GP32C Microcontroller, QFP-44 10X10 FB CRCW0805000FT CRCW08051001F CRCW08051002F Res, 0-OHM, 0805 Res, 1K, 0805, 1/10W, 1%. 100ppm Res, 10K, 0805, 1/10W, 1%. 100ppm
29 30 31
7 11 43
R5 R20 R30-31 R33 R45 R50 R7-10 R29 R37 R60 R70-72 R77
R1-2 R6 R11 R16 10K R18-19 R26 R38 R40-41 R43 R46 R49 R51 R54 R61 R63 R68-69 R74-75 R7999 R55 R62 R76 R78 R34 R13 R32 R4 R14-15 R17 R42 R65-66 R27-28 12.1K 22.1 330 3.3K 3.32K
32 33 34 35 36
4 1 2 7 2
Dale Dale Dale Dale Dale
CRCW08051212F CRCW080522R1F CRCW12063300F CRCW0805332J CRCW08053321F
Res, 12.1K, 0805, 1/10W, 1%. 100ppm RES_0805 Res, 22.1 OHMS, 0805, 1/10W, 1%. 100ppm Res, 330, 0805, 1/10W, 1%, 100ppm Res, 3.3K, 0805, 1/8W, 5%, 200ppm RES_0805 RES_0805 RES_0805
CDB4812
Res, 3.32K, 0805, 1/10W, 1%. 100ppm RES_0805
Item Qty
37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 5 2 6 1 4 1 1 2 1 1 1 1 2 1 3 6 4 1 3 10 1 4
Reference
Value
Manufacturer
Dale Dale Dale Dale Dale Dale Panasonic Bourns Bourns
Part Number
CRCW080533R2F CRCW08054752F CRCW08054753F CRCW1206106J CRCW1206220J CRCW1206334J MN13821-T 4610X-101-103 4610X-101-102
Description
Res, 33.2 OHMS, 0805, 1/10W, 1%. 100ppm Res, 475K, 0805, 1/10W, 1%. 100ppm Res, 10M, 1206, 1/8W, 5%, 200ppm Res, 22 OHMS, 1206, 1/8W, 5%, 200ppm Res, 330K, 1206, 1/8W, 5%, 200ppm Resistor Network, 9 Bussed, SIP10, 10K Resistor Network, 9 Bussed, SIP10, 100K Hex Inverter, SO14-150 Dual D-type Flip-flops, SO14-150
PCB Decal
RES_0805
DS291ADB1 10
R47-48 R56 R58 R64 33.2 R59 R73 47.5K
Res, 47.5K, 0805, 1/10W, 1%. 100ppm RES_0805 RES_0805 RES_1206 RES_1206 RES_1206 SIP10 SIP10 SO14-150 SO14-150
R3 R12 R39 R44 R53 475K R67 R36 R21-24 R25 U7 RP6 RP8 RP1 U4 U5 U1 U16-17 RP2 R35 R52 R57 RN1-6 RP3-5 RP7 U13 U10 U12 U15 U3 U11 U18 U21-27 U19 U6 U14 U20 U28 10M 22 330K 4.4V-4.7V 10K 1K 74HC04 74HC32
IC, Volt Detect, 4.4V N-CH OD, SC59A SC59A
Texas Instruments SN74HC04D Texas Instruments SN74HC32D
Quad 2-input Pos-OR Gate, SO14-150 SO14-150
SN74HC7 Texas Instruments SN74HC74D 4D 74HC138 2.2K 33 1K 33 Texas Instruments SN74HC138D Bourns Bourns Bourns Bourns 4816P-001-222 4816P-001-330 4816P-001-102 4816P-001-330
3-to-8 Line Decoder/Demux, SO16-150 SO16-150 Res Network, 2.2K, 8 Isolated, SO16220 Res Network, 33-OHM, 8 Isolated, SO16-220 Res Network, 33 OHM, 8 Isolated, SO16-220 Dual RS-232 Driver / Receiver Octal Buffers and Line Drivers, SO20300 SO16-220 SO16-220
Res Network, 1K, 8 Isolated, SO16-220 SO16-220 SO16-220 SO16-300 SO20-300
Texas Instruments MAX232DW Texas Instruments SN74HC541DW SN74HC5 Texas Instruments SN74HC574DW 74DW Microchip 25LC640CSN TLC2272C Texas Instruments TLC2272CD D
CDB4812
IC, Octal D-type Flip-flops, SO20W-300 SO20-300 SPI Serial EEPROM, 64K BIT, SO8-150 SO8-150 IC, Dual Op-amp, Low Noise, Single Supply, SO8 SO8-150
11 DS291ADB1
Item Qty
59 60 61 62 63 64 65 66 7 1 3 8 1 33 1 1
Reference
D1-2 D4-5 D7-9 Q4 Q1-3 S1-4 S10-13 U2 TP1-33 Y1 Y2
Value
LL4148
Manufacturer
Diodes Inc
Part Number
LL4148DI MMBT3906LT1 MMBT3904LT1 PTS645TL50
Description
PCB Decal
SOT23 SOT23 SW-MOMC&K TO-220AB TP60
General Purpose Signal Diode, SOD-80 SOD-80 Transistor, PNP, SOT23 Transistor, NPN, SOT23 Switch, Momentary, Pushbutton Voltage Regulator, Positive, Fixed, 5V, TO-220
MMBT390 Motorola 6 MMBT390 Motorola 4 MOM SW C&K
LM7805CT National Semicon- LM7805CT ductor 32.768KH Vishay Z 8.192MHZ Vishay
XT49S-20-32.768K Crystal, Parallel Cut, 32.768KHZ, 20PF, XTL-HC49S HC49S XT49S-20.8.192M Crystal, Parallel Cut, 8.192MHZ, 20PF, XTL-HC49S HC49S
CDB4812
CDB4812
9. APPENDIX A: MICROCONTROLLER FIRMWARE UPGRADES
The microcontroller for the CDB4812 is in-system programmable through the RS-232 port (DB9 serial connector). To obtain the firmware upgrades, please contact the Cirrus Logic DSP Applications Group. The firmware running on the CDB4812 microcontroller can be upgraded by using the procedure detailed below:
9.1 What's Needed for Microcontroller Programming
* * * PC with available COM port DB-9 Serial cable (common COM port cable) Terminal software (MicrosoftTM Windows HyperTerminal will work)
9.2 Programming Procedure
1. With the CDB4812 board powered off, connect the Serial cable from the PC COM port to the Serial Port on the CDB4812 2. Run the Terminal program on the PC and configure as follows: - Baud Rate - 115200 - Data Bits - 8 - Parity - none - Stop Bits - 1 - Flow Control - none - Line Delay - 3ms 3. On the CDB4812 header JP8 labeled MC, place the shunt in the PGM position for Program Mode 4. Connect power to the CDB4812 - on the terminal screen, the following text should appear: HC08 Bootloader Version 1.0
Boot>
5. At the prompt, type w. The following message should appear: Boot>w - Flash erase complete, erase successful 6. At the next prompt, type p. The following message should appear: Boot>p - waiting ... 7. In the Terminal program, send the .s19 file as a Text file (using ASCII transfer mode). In HyperTerminal, go to Transfer at the top of the window, and choose Send Text File. In the file browser, choose the .s19 file to send. 8. Several characters should appear on the screen as the file is transmitted. 9. After sending the firmware file, a success message and a prompt should appear as below: Flash programmed, verified Boot> 10. Power off the CDB4812. 11. Place the shunt on the JP8 MC header in the RUN position. 12. Apply power to the CDB4812, the board should be running the new firmware.
12
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CDB4812
10. APPENDIX B: FACTORY PRESET DEFAULT SETTINGS
This table describes the default relationship between each factory preset and the parameters that the Time, Regen, Speed, and Depth rotary encoders are assigned to. Also shown are default values of various parameters that the DSP uses for the factory presets (N/A indicates this encoder is not used in this mode).
Preset # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Time Encoder Changes N/A Reverb Time Reverb Time Delay Time Chorus Delay Chorus Delay N/A Reverb Time Reverb Time Reverb Time Reverb Time Reverb Time Reverb Time N/A Delay Time Chorus Delay Regen Encoder Changes N/A Reverb Room Size Reverb Room Size Delay Regen Chorus Regen Chorus Regen N/A Reverb Room Size Chorus Regen Chorus Regen Reverb Room Size Chorus Regen Chorus Regen N/A Delay Regen Chorus Regen Speed Encoder Changes N/A N/A N/A N/A Chorus Rate Chorus Rate Tremelo Rate Tremelo Rate Chorus Rate Chorus Rate Tremelo Rate Chorus Rate Chorus Rate Tremelo Rate Chorus Rate Chorus Rate Depth Encoder Changes N/A N/A N/A N/A Chorus Depth Chorus Depth Tremelo Depth Tremelo Depth Chorus Depth Chorus Depth Tremelo Depth Chorus Depth Chorus Depth Tremelo Depth Chorus Depth Chorus Depth
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CDB4812
11. APPENDIX C: CONFIGURING THE CDB4812 FOR PC GUI CONTROL
The following procedure will allow you to configure the CDB4812 for control via the CDB4816 PC GUI:
1. Use the procedure detailed in Appendix A to download the microcontroller image "pc-gui.s19" to the microcontroller. 2. Remove power from the CDB4812 board. 3. Install shunts across all 4 pairs of pins on J5. 4. Connect the PC parallel port to the CDB4812 with a 25 pin cable (supplied with the kit). 5. Reapply power to the CDB4812. 6. Start the CDB4812 GUI on the PC.
To reconfigure the board for stand-alone operation, use these steps:
1. Remove power from the board. 2. Disconnect the PC from the CDB4812. 3. Remove the shunts on all 4 pairs of pins on J5. 4. Reapply power to the CDB4812. 5. Using the procedure in Appendix A, download the micrcontroller image "standalone.s19" to the microcontroller. CAUTION The PC GUI CANNOT be used when the microcontroller is programmed with the stand-alone operation image. In this case, both the microcontroller and the PC will attempt to drive the communication lines to the DSP, and cause bus contention, which can result in damage to the microcontroller and/or the PC parallel port)
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* Notes *

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