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LM48901EVAL User Guide
Spatial Audio Speaker Array Evaluation System
www.ti.com/spatialaudio
2Q 2012
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LM48901EVAL User Guide, Rev B
Software Operation
LM48901 Controls and Operation ........................................... 9
Overview
System Components ............................................................... 3
System Hardware .................................................................... 3
System Software ..................................................................... 3
Sample Board Configurations ...................................12
System Setup
Installing Software ................................................................... 4
Connecting Hardware.............................................................. 4
Loading Coefficients .....................................................14
Equalization, Spatial Effect Adjustment,
and Volume Control .......................................................16
Jumper Connections ........................................................ 6
USB Interface ................................................................... 8
Appendix
Board Schematics ...................................................................20
Bill of Materials ........................................................................25
LM48901EVAL User Guide
 
LM48901EVAL User Guide, Rev B
Overview
This revised document describes the installation,
setup, and operation of the LM48901 Spatial Array
evaluation system. The LM48901 is a quad Class D
amplifier that utilizes Texas Instrument’s proprietary
spatial sound processor to create an enhanced
sound- stage for portable and small-stage
multimedia devices.
System Components
Evaluation system hardware
•LM48901EvaluationBoard
•USB2ANYI 2 C Interface
•10-pinadaptorboard
•Ribboncable
The LM48901 evaluation board (shown in Figure 1 )
accepts three audio input formats—stereo differential
analog, SPDIF, or I 2 S. Multiple boards are easily
cascaded, increasing the number of channels. The
LM48901 can also be configured as a 2.1 amplifier
for stereo + subwoofer applications.
Evaluation System Software
All software and drivers associated with the
LM48901 evaluation board are available for down-
load from the device product folder. The system
software consists of onboard and web application
as follows:
• LM48901_Control_SW_xxxx-setup.exe –
LM48901 control software
• MCRInstaller.exe –GraphicEqualizertooladdon
for the LM48901 control software
• Spatial Coeficient Generator – A web application
that generates the spatial coeficients
The board is controlled though a Windows- and
Mac OSX-compatible graphic user interface (GUI).
The GUI configures the device, loads spatial
coefficients, and provides a graphic equalizer. The
board connects to a computer through a USB
interface device (included).
LM48901 Features :
• Spatial sound processing
• I2S digital Input
• Differential-input stereo ADC
• EdgeratecontrolreducesEMIwhilepreservingaudio
quality and eficiency
• Short-circuit and thermal overload protection
• Minimum external components
• Click and pop suppression
• Micro-power shutdown
• Available in space-saving microSMD and LLP packages
Figure 1. LM48901 Evaluation Board
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LM48901EVAL User Guide
Texas Instruments
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LM48901EVAL User Guide, Rev B
Setup
Installing Software
Install LM48901 Evaluation Board Control Software
–ToinstalltheWelcomepanel–chooseNext.
– To install the Choose Install Location panel –
chooseNext.
– To install the Choose Start Menu Folder –
choose Install.
– To install the Installing panel – after iles load,
chooseNext.
– To install the Completing the Install panel –
choose Finish.
Single 5V Supply Operation,
Single Device/Master Device, SPDIF Source
– Do not place shunts across: JU2-6, JU12-14,
or JU18-19
– Place shunt on JU11 to connect PVDD and AVDD.
– Place shunt on JU8 to connect DVDD to 1.8V supply.
–PlaceshuntonJU9toconnectGNDtoDGND.
– Place shunt on JU10 to connect IOVDD to 3.3V supply.
– Place shunts on JU3-JU6 to connect I2S output of
SPDIF converter to LM48901.
– Place shunts on JU15 and JU16 to connect I 2 C pull up
resistors to 3.3V.
– Place shunt on JU7 to connect PVDD to SPDIF_VDD to
power SPDIF converter and 3.3V and 1.8V regulators.
– Place shunt across 1-2 (Optical) or 2-3 (Coax) on JU20
to select SPDIF input.
–PlaceshunttoVDDpositiononJU1(SHDN).
– Place shunt across 2-3 on JU17 to connect SDIO to
daisy chain connector.
– Connect 5V supply to PVDD header.
–ConnectgroundtoGNDheader.
– Connect SPDIF source to either J8 (optical)
or J9 (coax).
– Connect speakers across J1, J2, J3, and J4.
– Connect USB board to J12.
Connecting Hardware
Connecting the LM48901 Demo Board
– Single 5V Supply Operation, Single Device/Master
device,AnalogInput,NoMCLKSource
– Do not place shunts across JU2-6, JU12-14, or JU20.
– Place shunt on JU11 to connect PVDD and AVDD.
– Place shunt on JU8 to connect DVDD to 1.8V supply.
–PlaceshuntonJU9toconnectGNDtoDGND.
– Place shunt on JU10 to connect IOVDD to 3.3V supply.
– Place shunt on JU18 (XTAL VDD) to connect crystal
to 3.3V.
– Place shunt on JU19 to connect crystal output to
MCLKinputofLM48901.
– Place shunts on JU15 and JU16 to connect I 2 C pull up
resistors to 3.3V.
– Place shunt on JU7 to connect PVDD to SPDIF_VDD
to power SPDIF converter and 3.3V and1.8V regulators.
–PlaceshunttoVDDpositiononJU1(SHDN).
– Place shunt across 2-3 on JU17 to connect SDIO
to daisy chain connector.
– Connect 5V supply to PVDD header.
–ConnectgroundtoGNDheader.
–ConnectanalogaudiosourcetoJ5andJ6RCAjacks
ortoINR+/-andINL+/-headers.
– Connect speakers across J1, J2, J3, and J4.
– Connect USB board to J12.
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LM48901EVAL User Guide
Texas Instruments 4Q 2011
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LM48901EVAL User Guide, Rev B
Multiple Supply Operation, Single Device/Master
Device, Analog Input, No MCLK Source
– Do not place shunts across JU2-14 or JU20.
– Place shunt on JU18 (XTAL VDD) to connect crystal
to 3.3V.
– Place shunt on JU19 to connect crystal output
toMCLKinputofLM48901.
– Place shunts on JU15 and JU16 to connect I 2 C pull up
resistors to 3.3V.
–PlaceshunttoVDDpositiononJU1(SHDN).
– Place shunt across 2-3 on JU17 to connect SDIO
to daisy chain connector.
– Connect 5V supply to PVDD, AVDD and
SPDIF headers.
– Connect 3.3V supply to IOVDD.
– Connect 1.8V supply to DVDD.
–ConnectGNDtoGNDandDGNDheaders.
–ConnectanalogaudiosourcetoJ5andJ6RCAjacks
ortoINR+/-andINL+/-headers.
– Connect speakers across J1, J2, J3, and J4.
– Connect USB board to J12.
Multiple Supply Operation, Single Device/Master
Device, SPDIF Source
– Do not place shunts across JU2-6, JU8-14,
or JU18-19.
– Place shunts on JU3-JU6 to connect I2S output of
SPDIF converter to LM48901.
– Place shunts on JU15 and JU16 to connect I 2 C pull up
resistors to 3.3V.
– Place shunt on JU7 to connect PVDD to SPDIF_VDD to
power SPDIF converter and 3.3V and 1.8V regulators.
– Place shunt across 1-2 (Optical) or 2-3 (Coax) on JU20
to select SPDIF input.
–PlaceshunttoVDDpositiononJU1(SHDN).
– Place shunt across 2-3 on JU17 to connect SDIO to
daisy chain connector.
– Connect 5V supply to PVDD, AVDD, and
SPDIF headers.
– Connect 3.3V supply to IOVDD.
– Connect 1.8V supply to DVDD.
–ConnectGNDtoGNDandDGNDheaders.
– Connect SPDIF source to either J8 (optical)
or J9 (coax).
– Connect speakers across J1, J2, J3, and J4.
– Connect USB board to J12.
Slave Device
– Connect slave board J10 to master board J11.
The daisy chain connection provides all supplies,
grounds, I 2 C and I2S signals.
– Do not place shunts across JU2-16, or JU18-20.
–PlaceshunttoVDDpositiononJU1(SHDN).
– Place shunt across 2-3 on JU17 to connect SDIO
to daisy chain connector.
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LM48901EVAL User Guide
Texas Instruments
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