TAS5026REF Reference Design for the TAS5026 Digital Audio PWM Processor User’s Guide April 2003 Digital Audio/Application SLEU035
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EVM IMPORTANT NOTICE Texas Instruments (TI) provides the enclosed product(s) under the following conditions: This evaluation kit being sold by TI is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not considered by TI to be fit for commercial use.
EVM WARNINGS AND RESTRICTIONS It is important to operate this EVM within the specified input and output ranges described in the EVM User’s Guide. Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM. If there are questions concerning the input range, please contact a TI field representative prior to connecting the input power.
Information About Cautions and Warnings Preface Read This First About This Manual This manual describes the TAS5026REF reference design from Texas Instruments. How to Use This Manual This document contains the following chapters: - Chapter 1 – Introduction - Chapter 2 – System Interfaces - Chapter 3 – Schematic, Parts List, PCB Specification, and PCB Layout Information About Cautions and Warnings This book may contain cautions and warnings. This is an example of a caution statement.
Related Documentation From Texas Instruments Related Documentation From Texas Instruments The following is a list of data manual that have detailed descriptions of the integrated circuits used in the design of the TAS5026REF evaluation module. The data manuals can be obtained at the URL http://www.ti.com. Part Number TAS5026PFB SN74LVC2G08DCTR SN74LVC08APWR SN74LVC126APWR TPA112DGN Literature Number SLES041 SCES198 SCAS283 SCAS339 SLOS212 Trademarks Equibit is a trademark of Texas Instruments.
Contents Contents 1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1 TAS5026REF Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2 PCB Key Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.3 Jumper Settings . . . . . . . . . . . . . . . . . . . . . . . .
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Chapter 1 Introduction The true digital audio amplifiers (TDAA) system consists of a PCM-PWM modulator device and a PWM power output device. The PCM-PWM processor accepts a serial PCM digital audio stream and converts it to a 3.3-V PWM audio stream. The TDAA output stage provides a large-signal PWM output. The digital PWM signal is then demodulated, providing power output for driving loudspeakers.
The TAS5026 has six independent volume controls with soft volume and mute. The TAS5026 supports bridged output configurations. The device operates in AD mode (2-level modulation scheme). This all-digital audio system contains only two analog components in the signal chain – an LC low-pass filter at each speaker terminal. The TAS5026 provides up to 96-dB SNR at the speaker terminals.
1.2 PCB Key Map The physical structure for the TAS5026REF is illustrated in Figure 1–2. Figure 1–2. Physical Structure for the TAS5026REF (Rough Outline) PWM Interface (J140) PWM Processor Section Control Interface (J100) JMP121 Headphone Amplifier Section JMP120 Head– Phone Out (J320) TI TAS5026REF Digital Audio Interface (J160) 1.
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Chapter 2 System Interfaces This chapter describes the TAS5026REF system interfaces. Topic Page 2.1 Digital Audio Interface (J160) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 2.2 Control Interface (J100) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3 2.3 PWM Interface (J140) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1 Digital Audio Interface (J160) The digital audio interface contains digital audio signal data (I2S), clocks, etc. See the TAS5026 data manual, SLES041, for signal timing and details not explained in this document. Table 2–1. Digital Audio Interface Pin Connections Pin No.
2.2 Control Interface (J100) The control interface connects the TAS5026 board to the microcontroller section. Table 2–3. Control Interface Pin Connections Pin No. Net Name Description 01 GND Ground 02 V-HBRIDGE-CONTROL Not used 03 GND Ground 04 RESET System reset (bidirectional). The TAS5026 enters a 4-ms initiation sequence before PWM signals are present at the output. If a quit reset is desired, MUTE should be asserted low before applying RESET.
Table 2–3. Control Interface Pin Connections (Continued) Pin No. Net Name Description 19 DEM-SEL1 De-emphasis filter select bit 1 20 SD–E1 Shutdown error reporting group 1. The TAS51XX digital output stages (channel 1, 2, and 5) assert this signal low when an internal error occurs. This can be due to either an overtemperature protection or an overcurrent event. 21 SD–E2 Shutdown error reporting group 2.
2.3 PWM Interface (J140) The PWM interface connects the TAS5026REF board to the output stage module. Figure 2–1. Pin Numbers at PWM Interface (J140) 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49 Table 2–4. J140 Pin Description Pin No.
Table 2–4. J100 Pin Description (Continued) Pin No.
Chapter 3 Schematic, Parts List, PCB Specification, and PCB Layout The chapter contains the schematic, parts list, PCB specification, and PCB layout for the TAS5026REF.
Input & Output Section TI DIGITAL AUDIO GROUP ALL RIGHTS RESERVED - PATENTS PENDING TEXAS INSTRUMENTS INCORPORATED TAS5026REF
TAS5026 Section TI DIGITAL AUDIO GROUP ALL RIGHTS RESERVED - PATENTS PENDING TEXAS INSTRUMENTS INCORPORATED TAS5026REF
Headphone Amplifier Section TI DIGITAL AUDIO GROUP ALL RIGHTS RESERVED - PATENTS PENDING TEXAS INSTRUMENTS INCORPORATED TAS5026REF
TI Ref Des C100 C140 C200 C201 C202 C203 C204 C205 C206 C207 C208 C300 C320 C321 C322 C323 C324 C325 C326 C327 C328 C329 C330 C331 C332 C333 J100 J140 J160 J320 JMP120 JMP121 PCB R100 R101 R102 R103 R104 Part Number 200041060 200041060 Not used 200054730 200054720 200041060 200051040 Not used 200052240 200052240 Not used 200051040 200064710 200064710 200064710 200064710 200062210 200051040 200041060 200062210 200062210 200062210 200051040 200042270 Deleted Deleted 700820340 700820500 700820160 700353520
TI Ref Des R105 R106 R107 R108 R109 R120 R121 R160 R161 R162 R163 R164 R200 R201 R202 R203 R204 R205 R206 R207 R208 R209 R320 R321 R322 R323 R324 R325 R326 R327 R328 R329 R330 R331 R332 R333 R334 R335 TAS5026REF Parts List Part Number Description 100210020 100210020 100210020 100210020 100210020 100210020 100210020 100247090 100247090 100247090 100247090 100247090 100210020 100210020 100222000 100247090 100210080 100247080 Deleted Deleted 100222090 100247080 100282010 100282010 100282010 100282010 10021
TI Ref Des SHUNT120 SHUNT121 U120 U200 U300 U301 U302 U320 Part Number 700110210 700110210 520140083 500050261 520140140 520140081 520141262 510101121 TAS5026REF Parts List Description Black 2,54 mm shunt Black 2,54 mm shunt Dual AND gate, LVC 6 ch PWM processor (AD, VOL, 192kHz) Single Schmitt-Trigger Inverter, LVC Quad AND gate, LVC Quad buffer with output enable, LVC 150-mW stereo power amplifier Housing MSOP8 TQFP64 SOT23-5 TSSOP14 TSSOP14 MSOP8 Manufacturer Manufacturer Part Number Molex Molex
TI TAS5026REF PCB SPECIFICATION TAS5026REF PCB SPECIFICATION BOARD IDENTIFICATION: P164-PCB-001 (3.00) BOARD TYPE: DOUBLE-SIDED PLATED-THROUGH BOARD LAMINATE TYPE: FR4 LAMINATE THICKNESS: 1.6 mm COPPER THICKNESS: 35µm (INCL. PLATING EXTERIOR LAYER) COPPER PLATING OF HOLES: >25µm MINIMUM HOLE DIAMETER 0.
