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SBAU137 – April 2008

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Typical Performance and Measurement Examples

25

Measurement Examples

Figure 3-6. FFT (BPZ)

shows the out-of-band noise characteristic according to the system clock ratio and oversampling

mode (narrow/wide) setting. A relatively high ratio and wide mode is recommended for lower out-of-band

noise.

Figure 3-7. Out-of-Band Noise vs System Clock and Oversampling Condition

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Summary of Contents for PCM1681

Page 1: ...DEM DAI1681 PCM1681 Evaluation Module User s Guide Literature Number SBAU137 April 2008 ...

Page 2: ...Submit Documentation Feedback 2 SBAU137 April 2008 ...

Page 3: ...onstration Software 15 2 1 Overview 16 2 2 Installation 16 2 3 Using the Demonstration Software 17 2 3 1 HOLD and PASS 19 2 3 2 Applicable Function Control 19 3 Typical Performance and Measurement Examples 21 3 1 Typical Device Performance 22 3 2 Measurement Examples 23 4 Schematic PCB Layout and Bill of Materials 27 4 1 DEM DAI MDAC Schematics 28 4 2 DEM PCM1681 Schematic 31 4 3 Printed Circuit B...

Page 4: ...B 24 3 6 FFT BPZ 25 3 7 Out of Band Noise vs System Clock and Oversampling Condition 25 4 1 Low Pass Filter Schematic 28 4 2 Daughtercard Sockets Connector and Regulator Schematic 29 4 3 Digital Audio Interface Schematic 30 4 4 PCM1681 Daughtercard Schematic 31 4 5 DEM DAI MDAC Board Layout Silkscreen 32 4 6 DEM DAI MDAC Board Layout Top Component Side 33 4 7 DEM DAI MDAC Board Layout Bottom View ...

Page 5: ...Mode for PCM1681 12 1 3 SW001 002 003 Format Selection for CS8414 Digital Audio I F Receiver 12 1 4 HDR001 Signal Path Selection for Pin 1 of PCM1681 13 1 5 HDR002 Mode Control Selection of PCM1681 13 1 6 EVM Absolute Maximum Ratings 14 2 1 Applicable Function Control Summary 19 4 1 Bill of Materials DEM DAI MDAC 37 4 2 Bill of Materials DEM PCM1681 39 SBAU137 April 2008 List of Tables 5 ...

Page 6: ...Submit Documentation Feedback 6 List of Tables SBAU137 April 2008 ...

Page 7: ...from Texas Instruments How to Use This Manual Throughout this document the abbreviation EVM and the term evaluation module are synonymous with the DEM DAI1681 evaluation module Chapter 1 discusses the block diagram and primary features of the DEM DAI1681 This chapter also provides general information regarding the default switch and jumper configurations Chapter 2 explains how to use the software ...

Page 8: ...ta sheet SLES211 If You Need Assistance If you have questions regarding either the use of this evaluation module or the information contained in the accompanying documentation please contact the Texas Instruments Product Information Center at 972 644 5580 or visit the TI web site at www ti com FCC Warning This equipment is intended for use in a laboratory test environment only It generates uses an...

Page 9: ...iption The DEM DAI1681 is an evaluation board for the PCM1681 a 24 bit 192 kHz 8 channel audio DAC with digital audio receiver 8 channel second order post filter mode control interface to a personal computer PC and various switches and jumpers for configuration controls The DEM DAI1681 operates from 5 V and 15 V analog power supplies with an S PDIF input signal Project collateral discussed in this...

Page 10: ...0 Functional Block Diagram www ti com 1 1 Functional Block Diagram Figure 1 1 illustrates the functional block diagram of the DEM DAI1681 Figure 1 1 DEM DAI1681 Functional Block Diagram 1 2 EVM Description The DEM DAI1681 EVM is shipped with the following items EVM Motherboard DEM DAI MDAC EVM Daughtercard DEM PCM1681 CD ROM containing application software a copy of this user s guide and a PCM1681...

Page 11: ...control mode or the demonstration software S W SPI control 1 4 EVM Configuration Controls 1 4 1 Jumper Controls The following jumpers are provided onboard for configuration controls JP001 Set Interface of Digital Signal from DIR to DAC the device under test DUT The digital signal generated by the digital interface receiver DIR is input to this jumper For each shorted pin the corresponding digital ...

Page 12: ... De Emphasis and Mute Selection in Hardware Control Mode for PCM1681 MUTE as S2 MDI DEMP as S3 MC De Emphasis and Mute Selection On L On L Mute Off De Emphasis Off On L Off H Mute Off De Emphasis 44 1 kHz On Off H On L Mute On De Emphasis Off Off H Off H Mute On De Emphasis 44 1 kHz On Table 1 3 SW001 002 003 Format Selection for CS8414 Digital Audio I F Receiver SW003 M2 SW002 M1 SW001 M0 Data Fo...

Page 13: ... 3 2 HDR002 Select Mode Control of PCM1681 Either 1 2 3 4 5 6 or 7 8 must be shorted in order to select mode control type and oversampling condition of the PCM1681 Table 1 5 summarizes the mode control selection configuration for HDR002 Table 1 5 HDR002 Mode Control Selection of PCM1681 HDR002 Mode Control of PCM1681 1 2 3 4 5 6 7 8 Short Open Open Open S W I 2 C Control Mode Open Short Open Open ...

Page 14: ...1 6 summarizes the absolute maximum ratings for the DEM DAI1681 EVM Table 1 6 EVM Absolute Maximum Ratings Parameter DEM DAI1681 EVM UNIT MIN TYP MAX Power Supplies 5 V Power supply CN054 6 V 15 V Power supply CN051 3 18 V Signal Inputs S PDIF input CN001 2 V PC interface input CN003 0 4 V Signal Outputs Line outputs CN201 to CN208 4 V ...

Page 15: ...BAU137 April 2008 Demonstration Software This chapter provides information regarding the software that is provided with the DEM DAI1681 The software allows programming of the PCM1681 internal registers Topic Page 2 1 Overview 16 2 2 Installation 16 2 3 Using the Demonstration Software 17 ...

Page 16: ...roduct folder at www ti com To install the software on the PC first create a new folder on your hard disk drive with an appropriate name such as DEM1681 Next load the CD ROM into the PC and navigate to the DEM1681 folder on the CD ROM Copy all the files in the DEM1681 directory to the new folder on the PC Open the configuration setting file named dem1608 ini using a text editor such as Notepad or ...

Page 17: ...instructs the program to rewrite the PCM1681 internal registers with the data currently selected in the application window This window and function is not applicable on the PCM1681 Exit closes the application The Window menu includes five options Attenuation control see Figure 2 2 enables users to control PCM1681 digital attenuation level by changing the slider position for each channel Operation ...

Page 18: ... Demonstration Software SBAU137 April 2008 Submit Documentation Feedback Using the Demonstration Software www ti com Figure 2 2 Attenuation Control Figure 2 3 Operation Control Figure 2 4 Function Control ...

Page 19: ... Control 0 dB to 63 dB in 0 5 dB Steps 0 dB No Attenuation Applicable Soft Mute Control Mute Disabled Applicable DAC1 8 Operation Control DAC1 8 Enabled Applicable Audio Data Format Control 16 Bit to 24 Bit Left Justified Partly Applicable 1 Digital Filter Roll Off Control Sharp Roll Off Applicable De Emphasis All Channel Function Control De Emphasis All Channel Disabled Applicable De Emphasis All...

Page 20: ...Submit Documentation Feedback 20 Demonstration Software SBAU137 April 2008 ...

Page 21: ...Examples This chapter presents typical performance and a measured data example of the PCM1681 on the DEM PCM1681 The process of measuring dynamic characteristics is also discussed along with example characteristic data Performance evaluations used the Audio Precision SYS 2722 audio analyzer Topic Page 3 1 Typical Device Performance 22 3 2 Measurement Examples 23 ...

Page 22: ...mple of PCM1681 performance on a DEM DAI1681 with default settings 110 108 106 104 102 100 98 96 94 92 90 PCM1681 PERFORMANCE vs fS fSYS CONDITION Narrow 0 5 0 4 0 3 0 2 0 1 0 0 1 0 2 0 3 0 4 0 5 48k 512fS 96k 256fS 192k 128fS fS fSYS Condition Figure 3 1 PCM1681 Performance vs fS Sampling Rate and fSYS System Clock Dynamic Range Ch Sep Gain Error THD N SNR Gain Error dB THD N DR SNR Channel Separ...

Page 23: ...mples Figure 3 2 illustrates THD N performance according to a 1 kHz signal sweep of the digital input level Figure 3 2 THD N vs Input Level Figure 3 3 through Figure 3 6 show FFT results for full scale performance and characteristic performance under a range of conditions FFT data numbers are 32 k points for all four FFT graphs Figure 3 3 FFT 0 dB ...

Page 24: ...24 Typical Performance and Measurement Examples SBAU137 April 2008 Submit Documentation Feedback Measurement Examples www ti com Figure 3 4 FFT 60 dB Figure 3 5 FFT 90 dB ...

Page 25: ...es www ti com Figure 3 6 FFT BPZ Figure 3 7shows the out of band noise characteristic according to the system clock ratio and oversampling mode narrow wide setting A relatively high ratio and wide mode is recommended for lower out of band noise Figure 3 7 Out of Band Noise vs System Clock and Oversampling Condition ...

Page 26: ...Submit Documentation Feedback 26 Typical Performance and Measurement Examples SBAU137 April 2008 ...

Page 27: ... MDAC and the DEM PCM1681 The bill of materials BOM is included for component and manufacturer reference Note Board layouts are not to scale These are intended to show how the board is laid out they are not intended to be used for manufacturing DEM DAI1681 PCBs Topic Page 4 1 DEM DAI MDAC Schematics 28 4 2 DEM PCM1681 Schematic 31 4 3 Printed Circuit Board Layout DEM DAI MDAC 32 4 4 Printed Circui...

Page 28: ... 7 5 U201 R208 CN202 RCA pj VOUT 4 JP208 R210 8 2k JP210 R212 1k C218 120pF JP212 C216 120pF 6 8 7 5 U202 R216 CN204 RC A pj C202 1200pF C204 1200pF OPA2134A 100 2 2 C212 1200pF C214 1200pF OPA2134A 100 2 2 R221 15k R229 15k C227 120pF C237 120pF R217 8 2k JP213 JP215 R219 1k JP217 C225 120pF CN205 R225 8 2k JP219 JP221 R227 1k JP223 C235 120pF R231 CN207 V OUT5 2 1 3 U203 R223 100 RCA pj VOUT 7 2...

Page 29: ...16V C053 100µF 16V 100µF 16V RST C101 10uF CN101 CN104 CN102 SCLK CLKO GND BCK LRCK DATA1 DATA2 DATA3 R101 R102 R103 R104 R105 R107 R109 16V 22 22 22 22 22 22 22 VDD GND SCKI SCKO GND BCK LRCK DIN1 DIN2 DIN3 VOUT1 VOUT2 GND VOUT3 VOUT4 GND VOUT5 VOUT6 GND VOUT7 VOUT1 VOUT2 VOUT3 VOUT4 VOUT5 VOUT6 VOUT7 DATA4 R111 22 DIN4 VOUT8 GND VOUT8 CN103 CN105 Figure 4 2 Daughtercard Sockets Connector and Reg...

Page 30: ...21 AGND 20 FILT 6 9 7 8 GND SW004 FP1F 2M 2 4 5 6 CN001 RCA pj C004 0 1uF C003 10uF 16V C001 DAI select INT CS8414 10 RXN 11 FSYNC 12 SCK 13 CS12 FCK 14 U MCK 19 M2 18 M3 17 SEL 16 CBL 15 R002 470 C009 0 068uF C010 0 1uF U003 74VHC14 1 Vcc 14 2 13 3 12 4 11 5 10 C012 10uF 16V R001 75 0 01uF e SCLK e BCK EXT SW005 FT2D 2M SCLK BCK C013 0 1uF 1 Vcc 20 2 19 3 18 4 17 5 16 SCLK BCK BCK 6 9 7 GND 8 e L...

Page 31: ... Documentation Feedback Schematic PCB Layout and Bill of Materials 31 www ti com DEM PCM1681 Schematic 4 2 DEM PCM1681 Schematic Figure 4 4 illustrates the schematic for the DEM PCM1681 Figure 4 4 PCM1681 Daughtercard Schematic ...

Page 32: ...it Documentation Feedback Printed Circuit Board Layout DEM DAI MDAC www ti com 4 3 Printed Circuit Board Layout DEM DAI MDAC Figure 4 5 through Figure 4 7 illustrate the printed circuit board PCB layout for the DEM DAI MDAC Figure 4 5 DEM DAI MDAC Board Layout Silkscreen ...

Page 33: ...BAU137 April 2008 Submit Documentation Feedback Schematic PCB Layout and Bill of Materials 33 www ti com Printed Circuit Board Layout DEM DAI MDAC Figure 4 6 DEM DAI MDAC Board Layout Top Component Side ...

Page 34: ...34 Schematic PCB Layout and Bill of Materials SBAU137 April 2008 Submit Documentation Feedback Printed Circuit Board Layout DEM DAI MDAC www ti com Figure 4 7 DEM DAI MDAC Board Layout Bottom View ...

Page 35: ...terials 35 www ti com Printed Circuit Board Layout DEM PCM1681 4 4 Printed Circuit Board Layout DEM PCM1681 Figure 4 8 through Figure 4 10 illustrate the PCB layout for the DEM PCM1681 Figure 4 8 DEM PCM1681 Board Layout Silkscreen Figure 4 9 DEM PCM1681 Board Layout Top Component Side ...

Page 36: ...36 Schematic PCB Layout and Bill of Materials SBAU137 April 2008 Submit Documentation Feedback Printed Circuit Board Layout DEM PCM1681 www ti com Figure 4 10 DEM PCM1681 Board Layout Bottom View ...

Page 37: ...1M ELNA 1 C056 Tantalum Electrolytic Capacitor 10µF 16V DN1C100M1S NEC 16 C201 C202 C203 C204 C211 C212 C213 C214 C221 C222 C223 C224 C231 C232 C233 C234 Film Capacitor 1200pF APSF0100J122 Nissei Electric 16 C205 C206 C207 C208 C215 C216 C217 C218 C225 C226 C227 C228 C235 C236 C237 C238 Film Capacitor 120pF APSF0100J121 Nissei Electric 1 CN001 RCA Connector Yellow LPR6520 0804 SMK 1 CN002 Pin Head...

Page 38: ...8 R203 R204 R211 R212 R219 R220 R227 R228 Metal Film Resistor 1k 1 4W F SN14C2C KOA 8 R205 R206 R213 R214 R221 R222 R229 R230 Metal Film Resistor 15k 1 4W F SN14C2C KOA 8 R207 R208 R215 R216 R223 R224 R231 R232 Metal Film Resistor 100 1 4W F SN14C2C KOA 1 RA001 Resistor Array 47k x 5 J M6 1 473J Beckman 3 SW001 SW002 SW003 Toggle Switch SPDT FT1D 2M Fujisoku 1 SW004 Push Switch FP1F 2M Fujisoku 1 ...

Page 39: ...005 C007 C009 Ceramic Capacitor 0 1µF 2125 GRM21BB11H104KA0 1 Murata 13 C002 C004 C006 C008 C010 C011 to C018 Aluminum Electrolytic Capacitor 10µF 16V R3A 16V100M ELNA 2 CN001 CN003 Pin Header 10 Pins FFC 10AMEP1 Honda 1 CN002 Pin Header 12 Pins FFC 12AMEP1 Honda 1 CN004 Pin Header 11 Pins FFC 11AMEP1 Honda 1 HDR001 Pin Header 3 Pins FFC 3AMEP1 Honda 1 HDR002 Pin Header 8 Pins FFC 8BMEP1 Honda 1 R...

Page 40: ...uct This notice contains important safety information about temperatures and voltages For additional information on TI s environmental and or safety programs please contact the TI application engineer or visit www ti com esh No license is granted under any patent right or other intellectual property right of TI covering or relating to any machine process or combination in which such TI products or...

Page 41: ...se resources are subject to change without notice TI grants you permission to use these resources only for development of an application that uses the TI products described in the resource Other reproduction and display of these resources is prohibited No license is granted to any other TI intellectual property right or to any third party intellectual property right TI disclaims responsibility for...

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