SAA7710T Dolby Pro-Logic Plug-In Module Kit for TDA9875 Digital
Contents
1. Philips Semiconductors SAA7710T Dolby Pro Logic Plug In Module Kit for Application Note TDA9875 Digital TV Sound Processor Demonstration Board Version 1 1 AN96115 6 INSTRUCTIONS TO GET STARTED Always apply power to the demonstration boards affer switching on the PC to prevent damage to PC printer port The 2 jumpers JUO1 and JUO3 on the TDA9875 demo board should be fitted to provide 5 V supply to the SAA7710T plug in module Run the TDA9875 software first and check the following All relevant level controls may be set to 0 db and the balance controls should be set centrally In the Signal Paths dialogue box check that the ADC in Source is set to Scart1 in or otherwise as appropriate In the Features Interface dialogue box check the following The IIS1 out Source is ADC L R NB take great care that this and similar controls are set to L R By default they reset otherwise and this may in the Dolby system mute the left and right channels The System Clock is set to 512 x Fs 216 384 MHz The Serial Audio is set to IIS On the Main Screen check that The Loudspeaker Source is set to IIS1 L R The Headphone Source is set to IIS2 L R Using the Sound IF dialogue box reset the SAA7710 by taking TDA9875 port 2 low and then high again NB press OK after each stage Do not just sel2. Philips Semiconductors SAA7710T Dolby Pro Logic Plug In Module Kit for Application Note TDA9875 Digital TV Sound Processor Demonstration Board Version 1 1 AN96115 APPLICATION NOTE SAA7710T Dolby Pro Logic Plug In Module Kit for TDA9875 Digital TV Sound Processor Demonstration Board Version 1 1 AN96115 Author s V Pham Philips Semiconductors Systems Laboratory Southampton England Keywords TV Set Top Box Dolby Pro Logic Surround Sound Digital TV Sound Processor Module Kit SAA7710T TDA9875 Date 22 October 1996 Philips Semiconductors SAA7710T Dolby Pro Logic Plug In Module Kit for TDA9875 Digital TV Sound Processor Demonstration Board Version 1 1 Application Note AN96115 Summary A SAA7710T Dolby Pro Logic Surround Sound DSP Core Plug in Module Kit for the TDA9875 Digital TV Sound Processor Demonstration Board has been built and it demonstrates how simple it is to interface the SAA7710T to the TDA9875 Philips Semiconductors SAA7710T Dolby Pro Logic Plug In Module Kit for Application Note TDA9875 Digital TV Sound Processor Demonstration Board Version 1 1 AN96115 Table of Contents Page Number 1 INTRODUCTION 7 2 CONTENTS OF KIT 7 3 ADDITIONAL REQUIREMENTS NOT SUPPLIED 7 4 PRINCIPLE OF OPERATION 8 5 INSTALLATION NOTES 8 6 INSTRUCTIONS TO GET STARTED 9 7 CONCLUSION 10 8 REFERENCES 10 List of Tables 1 Component List of the SAA7710T Plug In Module 15 2 Parts List of the SAA771
3. APPLICATION NOTE SAA7710T Dolby Pro Logic Plug In Module Kit for TDA9875 Digital TV Sound Processor Demonstration Board Version 1 1 AN96115 Philips PHILIPS Semiconductors Philips Semiconductors SAA7710T Dolby Pro Logic Plug In Module Kit for Application Note TDA9875 Digital TV Sound Processor Demonstration Board Version 1 1 AN96115 Abstract A simple plug in module for the TDA9875 demonstration board has been developed at Philips Semiconductors Systems Laboratory Southampton PS SLS Based on the SAA7710T IC the module adds Dolby Pro Logic Surround Sound decoding facilities to this Digital TV Sound Processor The module kit and its method of use are outlined Purchase of Philips Ko components conveys a license under the Philips Ic patent to use the components in the 2c system provided the system conforms to the IC specifications defined by Philips Philips Electronics NV 1996 All rights are reserved Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner The information presented in this document does not form part of any quotation is believed to be accurate and reliable and may be changed without notice No liability will be accepted by the publisher for any consequence of its use Publication thereof does not convey nor imply any license under patent or other industrial or intellectual property rights 2
4. U1 SAA7710T Dolby Surround Pro Logic Core Philips Semiconductors SAA7710T Dolby Pro Logic Plug In Module Kit for TDA9875 Digital TV Sound Processor Demonstration Board Version 1 1 AN96115 Table 2 Parts List of the SAA7710T Plug In Module Application Note Item Code No Part Type Description Quantity 1 10017710 SAA7710T Dolby Surround Pro Logic Core 1 Ut 2 20930101 RC 11 Philips SMT resistor 100R 5 0 1 W 2 R2 R3 3 20930104 RC 11 Philips SMT resistor 100 k 596 0 1 W 1 R4 4 20930472 RC 11 Philips SMT resistor 4k7 5 0 1 W 1 R1 5 40890109 0805 SM Cap 10p 0805 NPO 1 C7 6 40890399 0805 SM Cap 39p 0805 NPO 1 C6 7 40897103 0805 SM Cap 10n 0805 X7R 1 C5 8 40897104 0805 SM Cap 100n 0805 X7R 4 C1C2C4C8 9 40906474 1206 SM Cap 470n 1206 X7R 1 C3 10 81130010 SMB SKT Sub min bayonet snap on PC socket 1 SMB1 11 86162034 MKF19393 Connector 3 Way Stocko 1 STO2 12 86162044 MKF 19394 Connector 4 Way Stocko 1 STOS3 13 86162074 MKF 19397 Connector 7 Way Stocko 1 STO1
5. TDA9875 Digital TV Sound Processor Demonstration Board Version 1 1 AN96115 TDAS875 DEMONSTRATION BOARD SAAT710T PLUG IN MODULE IIS BUS DATA INPUT 1 SCART 1 INPUTS SYSCLK HARDWARELESS IIC CABLE Figure4 Interconnection Set Up 13 Philips Semiconductors SAA7710T Dolby Pro Logic Plug In Module Kit for Application Note TDA9875 Digital TV Sound Processor Demonstration Board Version 1 1 AN96115 R1 100R STOCKO Connector Top View Figure 5 Hardwareless I C Cable Configuration 14 Philips Semiconductors SAA7710T Dolby Pro Logic Plug In Module Kit for TDA9875 Digital TV Sound Processor Demonstration Board Version 1 1 Application Note AN96115 Table 1 Component List of the SAA7710T Plug In Module Component Part Type Value Description C1 0805 100n SM Cap 100n 0805 X7R C2 0805 100n SM Cap 100n 0805 X7R C3 1206 470n SM Cap 470n 1206 X7R C4 0805 100n SM Cap 100n 0805 X7R C5 0805 10n SM Cap 10n 0805 X7R C6 0805 39p SM Cap 39p 0805 NPO C7 0805 10p SM Cap 10p 0805 NPO C8 0805 100n SM Cap 100n 0805 X7R R1 RC 11 4k7 Philips SMT resistor 4k7 596 0 1 W R2 RC 11 100R Philips SMT resistor 100R 596 0 1 W R3 RC 11 100R Philips SMT resistor 100R 5 0 1 W R4 RC 11 100 k Philips SMT resistor 100 k 596 0 1 W SMB1 SMB SKT Sub min bayonet snap on PC socket m STO1 MKF19393 Connector 7 Way Stocko STO2 MKF19394 Connector 3 Way Stocko ST03 MKF 19397 Connector 4 Way Stocko
6. 0T Plug In Module 16 List of Figures 1 Schematic Diagram of the SAA7710T Plug In Module 11 2 PCB Lay Out Component Side of the SAA7710T Plug In Module 12 3 Simplified Block Diagram for SAA7710T and TDA9875 12 4 Interconnection Set Up 13 5 Hardwareless C Cable Configuration 14 Philips Semiconductors SAA7710T Dolby Pro Logic Plug In Module Kit for Application Note TDA9875 Digital TV Sound Processor Demonstration Board Version 1 1 AN96115 Philips Semiconductors SAA7710T Dolby Pro Logic Plug In Module Kit for Application Note TDA9875 Digital TV Sound Processor Demonstration Board Version 1 1 AN96115 1 INTRODUCTION A cost effective solution for Dolby Pro Logic Surround Sound in a TV or a set top box can be implemented using the Dolby Pro Logic Surround Sound DSP Core IC SAA7710T and the TDA9875 Digital TV Sound Processor IC To demonstrate how simple it is to interface the SAA7710T with the TDA9875 Philips Semiconductors Systems Laboratory Southampton PS SLS has built an SAA7710T Plug in Module Kit to be used with the Digital TV Sound Processor TDA9875 Demonstration Board from Philips Semiconductors Systems Laboratory Hamburg PS SLH This version of the board Version 1 1 PCAL5193 1 PCB omits provision for unnecessary connectors included in Version 1 0 PCAL5193 0 PCB 2 CONTENTS OF KIT SAA7710T plug in module PCB number PCAL5193 1 see Figure 1 on Page 11 and Figure 2 on Page 12 I C
7. 1 Product Development Design amp Application Consumer ICs Nijmegen Philips Semiconductors ion Note AN96115 t Ica Appl TDA9875 Digital TV Sound Processor Demonstration Board Version 1 1 ic Plug In Module Kit for Log SAA7710T Dolby Pro einpoyw u Bnid 10127VVS 94 jo weeg oneueuos AWNOLVHOUV I NOILVOI IddV SYOLONGNOOIWAS SdI IIHd dO ALYAdOud pts dus t suaans t6 S IVOd dod SL86VaL Aoa AINGOW 6TSIWOd ddd uoLv 2 GNOG GONOG Dposoddsad d anod MLT dee uot woot gr eaxssa 92 MOOT Cu gijle xaaa anoa C TLuoot MOOT tans dot Lo quur ee L TOLs 9 TOLS S TOOLS P TOIS gzput viva eutdsa TOS Z TOLS T LOLS 86 L3novLvad Tada ezEoneweva AOLHS anoa ogi Wewnva aoza TZ urwLvd tanodsd tugasa TSSA ugoT Tz ESSA 3noxog 82 qnosm LOILLVNS To L ounBi4 11 Philips Semiconductors SAA7710T Dolby Pro Logic Plug In Module Kit for Application Note TDA9875 Digital TV Sound Processor Demonstration Board Version 1 1 AN96115 JOB ID NAME PCAL5193 1 LAYER No_ 102 amp 103 LAYER TITLE SMD 7 SolC Figure 2 PCB Lay Out Component Side of the SAA7710T Plug In Module 2nd SIF or AUDIO BASE BAND TD A9 8 7 5 SCART1 SCART2 EXTERNAL IIS INPUT 1 L R IIS INPUT 2 C S Figure3 Simplified Block Diagram for SAA7710T and TDA9875 12 Philips Semiconductors SAA7710T Dolby Pro Logic Plug In Module Kit for Application Note
8. Cable for PC SMB Lead approximately 10 cm 3 ADDITIONAL REQUIREMENTS NOT SUPPLIED The TDA9875 demonstration board PCB number H5ACS23 or its successor from PS SLH The demonstration software for TDA9875 demonstration board from PS SLH The demonstration software for SAAT7710T evaluation kit from Philips Semiconductors Nijmegen It is assumed that the user is familiar with the operation of all of the above Philips Semiconductors SAA7710T Dolby Pro Logic Plug In Module Kit for Application Note TDA9875 Digital TV Sound Processor Demonstration Board Version 1 1 AN96115 4 PRINCIPLE OF OPERATION The simplified block diagram for the SAA7710T and TDA9875 is shown in Figure 3 on Page 12 The digitised left and right signals are fed from the TDA9875 I S output port 1 to the SAA7710T I S input port 1 which returns Dolby processed left and right signals plus centre and surround signals to the TDA9875 I S input ports 1 and 2 respectively These digital signals are converted by the four DACs in the TDA9875 to analogue left and right signals on its main output plus centre and surround signals on its auxiliary output 5 INSTALLATION NOTES The interconnection set up is shown in Figure 4 on Page 13 The SAA7710T module PCAL5193 1 PCB plugs directly into sockets ST02 STO4 and STO5 of the TDA9875 demonstration board H5ACS23 PCB or its successor from PS SLH A clock connection is required from the SMB connect
9. ect low and then high otherwise the low will not have been sent Leave the TDA9875 software running Run the SAA7710T demonstration software During this initialisation the TDA9875 software may return with a IC message dialogue box which asks if you want to suppress subsequent messages Indicate Yes and toggle back to the SAA7710T software Check the following All relevant level controls may be set to 0 dB Input 1 is selected NB this SAA7710T module does not support input 2 The Decoder Main Mode is Full Dolby Pro Logic The Centre Channel Mode is Normal Check for correct operation by running the noise generator NB If there are unexpected results check the relevant TDA9875 channel settings are all L R Philips Semiconductors SAA7710T Dolby Pro Logic Plug In Module Kit for Application Note TDA9875 Digital TV Sound Processor Demonstration Board Version 1 1 AN96115 7 CONCLUSION By utilising the four DACs of the TDA9875 for the Dolby processed L R C S Dolby Pro Logic Surround Sound can be easily added to a TV or a set top box design using the SAA7710T 8 REFERENCES 1 SAA7710T DSP Core Dolby Pro Logic Surround Dolby 3 Stereo Tentative Specification 17 November 1995 2 TDA9875 Digital TV Sound Processor Objective Specification 03 September 1996 3 SAA7710T Dolby Pro Logic Evaluation Kit Version 1 0 User Manual Report number NDA UM9500
10. or SYSCLK on the TDA9875 board to the SMB connector SMB1 on the SAA7710T board A short SMB cable is provided for this purpose The kit is intended for use with a single PC running both the TDA9875 and the SAA7710T demonstration software A special IC interface cable is provided which should connect the printer port of the PC to socket ST03 on the TDA9875 board see Figure 5 on Page 14 for new cable make up This cable is configured for the SAA7710T software To make the TDA9875 software work with this cable its I2C configuration must be set to hardwareless The interface cable supplied does not support flagO flag1 facilities in the SAA7710T debugger software It contains only I C connections and not the extra flag wires The system utilises the auxiliary headphone outputs of the TDA9875 for the centre and surround channels Connect the left and right outputs from socket ST13 and the centre and surround outputs from socket ST12 centre to the left channel to your power amplifiers Connect a Dolby Pro Logic encoded stereo signal source to the SCART 1 input socket ST08 on the TDA9875 board SCART 2 or other input may be used but modify the TDA9875 ADC source setting accordingly There is no hardware reset switch on the SAA7710T board but the reset pin of the IC is connected to port 2 of the TDA9875 Therefore the SAA7710T can be reset from the TDA9875 software by taking port 2 low and then high again
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