19-4169; Rev 1; 3/10
MAX9856 Evaluation Kit
The MAX9856 evaluation kit (EV kit) consists of a
MAX9856 evaluation board and software. The MAX9856
EV kit is a fully assembled and tested PCB that evaluates the MAX9856 high-performance, low-power stereo
audio CODEC with microphone inputs, DirectDrive®
headphone amplifiers, and stereo line outputs. The EV
kit is designed to send and receive digital audio data in
the Sony/Philips digital interface (S/PDIF) format and
can be optionally configured to communicate using
generic digital audio or I2S-compatible signals. The EV
kit provides RCA jacks for connecting analog input signals, analog output signals, and digital S/PDIF signals. A
3.5mm headphone jack provides easy connection of
headphones to the circuit board. Another 3.5mm microphone jack provides easy connection of microphones to
the circuit board.
The MAX9856 EV kit includes Windows ® 2000-,
Windows XP®-, and Windows Vista®-compatible software that provides a simple graphical user interface
(GUI) for exercising the features of the MAX9856. The
EV kit is connected to a PC through a USB cable.
Features
o USB Connectivity (No External Power Supply
Required)
o Electrical S/PDIF Input/Output (with TOSLINK
Option)
o On-Board 12MHz Crystal Clock Oscillator
o On-Board S/PDIF Digital Audio Receiver
o On-Board S/PDIF Digital Audio Transmitter
o On-Board Power-Management IC
o Isolation Header for Direct Communication with
the MAX9856 I2C and Digital Audio Interfaces
o Easy-to-Use Menu-Driven Software
o Fully Assembled and Tested
o Windows 2000-, Windows XP-, and Windows
Vista-Compatible Evaluation Software
Ordering Information
PART
TYPE
MAX9856EVKIT+
EV Kit
+Denotes lead(Pb)-free and RoHS compliant.
PC INTERFACE
USB
System Diagram
DirectDrive is a registered trademark of Maxim Integrated
Products, Inc.
Windows, Windows XP, and Windows Vista are registered
trademarks of Microsoft Corp.
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Evaluates: MAX9856
General Description
Evaluates: MAX9856
MAX9856 Evaluation Kit
Component List
DESIGNATION
QTY
DESCRIPTION
DESIGNATION
QTY
10μF ±10%, 10V X5R ceramic
capacitors (0805)
TDK C2012X5R1A106K
C54
1
0.22μF ±10%, X7R 10V
ceramic capacitor (0603)
TDK C1608X7R1A224K
0.1μF ±10%, 16V X7R ceramic
capacitors (0603)
TDK C1608X7R1C104K
C69
1
1000pF ±5%, 50V C0G
ceramic capacitor (0603)
TDK C1608C0G1H102J
4.7μF ±20%, 6.3V X5R
ceramic capacitors (0603)
TDK C1608X5R0J475M
C70
1
0.022μF ±5%, 50V C0G
ceramic capacitor (1206)
TDK C3216C0G1H223J
D1
1
Green LED (0603)
1μF ±10%, 10V X7R ceramic
capacitors (0603)
TDK C1608X7R1A105K
D2
1
Red LED (0603)
FB1
1
Ferrite bead
TDK MMZ1608R301A (0603)
or equivalent
J1
1
USB type-B right-angle PCB
mount receptacle
J2
0
Not installed, 10-pin dual-row
header (2 x 5)
J3
1
Switched stereo headphone
jack (3.5mm)
J4, J6
2
White phono jacks
(side-entry PCB mount)
J5, J7
2
Red phono jacks
(side-entry PCB mount)
J8
1
Stereo headphone jack
(3.5mm)
J9
0
Not installed, 6-pin single-row
header (1 x 6)
J10
1
SMA PC-mount connector
J11, J12
2
Black phono jacks
(side-entry PCB mount)
REQUIRED COMPONENTS
C27, C31
C28, C32
C29, C30
2
2
2
C33–C36, C38, C39,
C40, C43, C44, C45,
C74, C78, C81, C85
14
R13
1
10kΩ ±5% resistor (0603)
SUPPORT COMPONENTS
C1, C12, C14,
C42, C75, C79,
C83, C86, C88
C2, C3
10μF ±10%, 10V X5R ceramic
capacitors (0805)
TDK C2012X5R1A106K
2
22pF ±5%, 50V C0G ceramic
capacitors (0603)
TDK C1608C0G1H220J
1
0.033μF ±10%, 25V X7R
ceramic capacitor (0603)
TDK C1608X7R1E333K
C5–C10, C17, C18,
C46, C48, C51, C53,
C56, C59, C77
15
0.1μF ±10%, 16V X7R ceramic
capacitors (0603)
TDK C1608X7R1C104K
C11, C47, C50, C52,
C55, C57, C58, C66,
C67, C73, C87
11
C13, C37, C41, C64,
C65, C68, C71, C72,
C76, C80, C82,
C84, C89
13
1μF ±10%, 10V X7R ceramic
capacitors (0603)
TDK C1608X7R1A105K
J13
0
Not installed, digital audio
optical receiver
Toshiba TORX147L
C15, C16
2
10pF ±5%, 50V C0G ceramic
capacitors (0603)
TDK C1608C0G1H100J
J14
0
Not installed, digital audio
optical transmitter
Toshiba TOTX147L
1
27-pin, three-row header (3 x 9)
0
Not installed, ceramic
capacitor (0603)
JU1
C49
JU2
1
3-pin header
C4
2
9
DESCRIPTION
0.01μF ±5%, 25V C0G
ceramic capacitors (0603)
TDK C1608C0G1E103J
_______________________________________________________________________________________
MAX9856 Evaluation Kit
DESIGNATION
QTY
JU4–JU10
7
2-pin headers
1
3.3μH ±5%, 270mA inductor
(1812)
Coilcraft 1812CS-332XJLB
L1
L2
1
DESCRIPTION
QTY
U2
1
Microcontroller (68 QFN-EP*)
Maxim MAXQ2000-RAX
U3
1
Power management IC
(20 TQFN)
Maxim MAX1799ETP+
U4
1
LDO regulator (5 SC70)
Maxim MAX8511EXK25+
U5
1
USB-to-UART converter
FTDI FT232BL
U6
1
93C46 type 3-wire EEPROM
Atmel AT93C46A-10SU-2.7
U11
1
I2C-to-parallel converter
(16 QSOP)
Maxim MAX1609EEE+
U13
1
Phase-locked loop
U15
1
192kHz digital audio transmitter
Cirrus Logic CS8406-CZZ
U16
1
192kHz digital audio receiver
Cirrus Logic CS8416-CZZ
U17
1
CPLD
Xilinx XC9536XL-7VGQ44C
Y1
1
16MHz crystal
Citizen HCM49-16.000MABJ-UT
Y2
1
6MHz crystal
Citizen HCM49-6.000MABJ-UT
Y3
0
Not installed, 32.768kHz crystal
Y4
1
3.3V, 12MHz crystal clock
oscillator
Citizen
CSX750FBC12.000000M-UT
—
17
Shunts
—
1
PCB: MAX9856 EVALUATION
KIT+
47μH ±5% 200mA inductor
(1812)
Coilcraft 1812LS-473XJLB
R1, R2
2
27Ω ±5% resistors (0603)
R3, R11, R12
3
1.5kΩ ±5% resistors (0603)
R4
1
470Ω ±5% resistor (0603)
R5, R16, R17,
R22, R44
5
2.2kΩ ±5% resistors (0603)
R6, R23, R28–R34
9
10kΩ ±5% resistors (0603)
R7, R8
2
220Ω ±5% resistors (0603)
R9
1
0Ω ±5% resistor (0603)
R10
1
3.01kΩ ±1% resistor (0603)
R14, R18, R19, R24
4
75Ω ±5% resistors (0603)
R15
1
1kΩ ±5% resistor (0603)
R20, R21
0
Not installed, resistors (0603)
R25, R26
2
100kΩ ±5% resistors (0603)
R27, R37, R38, R40
4
47kΩ ±5% resistors (0603)
R35
1
107Ω ±1% resistor (0603)
R36
1
243Ω ±1% resistor (0603)
R39
1
510Ω ±5% resistor (0603)
R41
1
75Ω ±1% resistor (0603)
R42
1
2.4kΩ ±5% resistor (0603)
T1
1
Digital audio transformer
Scientific Conversion, Inc.
SC979-03LF
TP1
0
Not installed, test point
1
Stereo audio CODEC
(40 TQFN-EP*)
Maxim MAX9856ETL+
U1
DESIGNATION
DESCRIPTION
*EP = Exposed pad.
Component Suppliers
SUPPLIER
PHONE
WEBSITE
Coilcraft, Inc.
847-639-6400
www.coilcraft.com
TDK Corp.
847-803-6100
www.component.tdk.com
Note: Indicate that you are using the MAX9856 when contacting these component suppliers.
_______________________________________________________________________________________
3
Evaluates: MAX9856
Component List (continued)
Evaluates: MAX9856
MAX9856 Evaluation Kit
MAX9856 EV Kit Files
FILE
DESCRIPTION
INSTALL.EXE
Installs the EV kit files on
your computer
MAX9856.EXE
Application program
FTD2XX.INF
USB device driver file
UNINST.INI
Uninstalls the EV kit software
USB_Driver_Help.PDF
USB driver installation
help file
Quick Start
Recommended Equipment
•
User-supplied Windows 2000, Windows XP, or
Windows Vista PC with a spare USB port
•
One standard USB peripheral cable
•
One pair of headphones (16< or greater)
•
One analog audio source
•
Three RCA interconnect cables
Refer to the MAX9856 IC data sheet while using this EV
kit for detailed descriptions of the CODEC’s features.
Note: In the following sections, software-related items
are identified by bolding. Text in bold refers to items
directly from the EV kit software. Text in bold and underlined refers to items from the Windows operating system.
Procedure
The MAX9856 EV kit is fully assembled and tested.
Follow the steps below to verify board operation in an
analog input, digital loopback, and analog output mode.
Once the board has been set up, verify that the board is
operating properly before beginning an evaluation.
1) Verify that all the jumpers are set in their default
positions. See Table 2 for default shunt positions.
7) Install the MAX9856 evaluation software on your
computer by running the INSTALL.EXE program.
The program files are copied and icons are created
in the Windows Start menu.
8) Connect the USB cable from the PC to the
MAX9856 EV kit board.
9) A Building Driver Database window pops up in
addition to a New Hardware Found message when
installing the USB driver for the first time. If you do
not see a window that is similar to the one described
above after 30s, and the device is not functional,
remove the USB cable from the MAX9856
EV kit board and reconnect it. Administrator
privileges are required to install the USB device
driver on Windows 2000/XP. Refer to the
USB_Driver_Help.PDF document included with the
software if you have trouble during this step.
10) Follow the directions of the Add New Hardware
Wizard to install the USB device driver. Choose the
Search for the Best Driver for your Device option.
Specify the location of the device driver as
C:\Program Files\MAX9856 (default installation
directory) using the Browse button.
11) Start the MAX9856 program by opening its icon in
the Start menu. The setup wizard Step 1 of 2 window appears (Figure 1).
12) In the Line Inputs group box, check LINEIN1/
LINEIN2. In the Digital Audio Inputs group box,
select S/PDIF.
13) Click the Continue button. The setup wizard Step 2
of 2 window appears, as shown in Figure 2.
14) In the Analog Outputs group box, check
Headphone. In the Digital Audio Outputs group
box, select S/PDIF.
15) Click the Finish button. The software main window
appears (Figure 3).
2) Connect a single RCA cable between the S/PDIF IN
jack (J12) and the S/PDIF OUT jack (J11).
16) Verify that the Hardware: connected message is
displayed in the status bar of the software main window. This indicates the proper operation of the EV kit.
3) Connect a stereo analog audio source to LINEIN1
and LINEIN2.
17) Audio should be at the headphones in approximately 2s.
4) Insert a pair of headphones into the HEADPHONE
jack (J3).
18) Click the OK button when a reminder window
appears.
5) Enable the stereo audio source output.
6) Visit (www.maxim-ic.com/evkitsoftware) to download the latest version of the EV kit software,
9856Rxx.ZIP.
4
_______________________________________________________________________________________
MAX9856 Evaluation Kit
Setup Wizard
When the program starts up, a software setup wizard
helps the user set up the software quickly. The wizard
collects information about the EV kit’s audio inputs and
outputs. The software then configures the EV kit automatically for the user.
Software Main Window
The left-hand side of the main window (Figure 3)
includes 10 tabs. On each tab, the user can exercise a
group of related configurations. Each control on the
GUI generates the expected I 2 C write operation to
update the internal registers of the MAX9856 and other
I2C devices on the EV kit.
The right-hand side of the main window displays the
data sent to and read from the MAX9856, as well as the
status of the MAX9856. Also, the S/PDIF receiver and
transmitter can be enabled and disabled here.
Figure 1. MAX9856 Evaluation Software (Setup Wizard Step 1 of 2)
_______________________________________________________________________________________
5
Evaluates: MAX9856
Detailed Description of Software
Evaluates: MAX9856
MAX9856 Evaluation Kit
Figure 2. MAX9856 Evaluation Software (Setup Wizard Step 2 of 2)
Figure 3. MAX9856 Evaluation Software (Main Window)
6
_______________________________________________________________________________________
MAX9856 Evaluation Kit
Evaluates: MAX9856
MAX9856 I2C Interface Activity
The MAX9856 I2C Interface Activity group box
(Figures 3 and 4) indicates the Register Address and
Data Sent/Received to or from the register. Use this
data to verify that a proper value is written to or read
from the MAX9856. Some operations may include several continuous register read or write, but only the last
register read or write operation is displayed.
Figure 4. MAX9856 Evaluation Software (MAX9856 I2C
Interface Activity Group Box)
MAX9856 Status
The current status is reported in the MAX9856 Status
group box (Figures 3 and 5). Click the Read Status button to poll the status of the MAX9856. Check the Interrupt
Enable checkbox next to the desired indicator to trigger
hardware interrupts when the alert condition occurs. If an
interrupt is generated, the IRQ Status (Active Low) indicator label displays a status “0” in red color.
Figure 5. MAX9856 Evaluation Software (MAX9856 Status
Group Box)
S/PDIF Receiver
The S/PDIF Receiver group box (Figures 3 and 6) controls the action of the on-board S/PDIF receiver. Check
Disable to disable the receiver. Select the electrical or
optical input by clicking the appropriate radio button.
S/PDIF Transmitter
The S/PDIF Transmitter group box (Figure 3) controls
the action of the on-board S/PDIF transmitter. Check
Disable to disable the transmitter. Both electrical and
optical outputs are simultaneously available.
Figure 6. MAX9856 Evaluation Software (MAX9856 S/PDIF
Receiver Group Box)
_______________________________________________________________________________________
7
Evaluates: MAX9856
MAX9856 Evaluation Kit
Options Menu
Advanced User Interface
In addition to the main control interface, direct I2C commands can be issued to any part on the EV kit through
the Interface (Advanced Users) menu item available
from the Options menu bar. The 2-wire interface diagnostics allow I2C operations, such as read byte and
write byte, to be executed. Uncheck the Auto Read
checkbox before using the 2-wire interface diagnostics.
The I2C dialog boxes accept numeric data in binary,
decimal, or hexadecimal. Hexadecimal numbers
should be prefixed by $ or 0x. Binary numbers must be
exactly eight digits. See Figure 7 for an example of this
control method.
View Register Settings
From the Options menu bar, select View Register
Settings to display the current register settings of the
MAX9856 (Figure 8) and optionally save them to a text file.
Save Settings … and Load Settings …
From the Options menu bar, select Save Settings …
to save the current EV kit configuration to a text file that
can be loaded at a later time. Select Load Settings …
to reload settings from a saved file.
Figure 7. Advanced User Interface Window (2-Wire Interface Tab)
8
_______________________________________________________________________________________
MAX9856 Evaluation Kit
SETTING
DESCRIPTION
48kHz digital
audio playback
Inputs: Digital audio on S/PDIF IN
Outputs: Stereo headphones and line outputs
48kHz digital
and analog
audio playback
Inputs: Digital audio on S/PDIF IN and
analog line inputs
Outputs: Stereo headphones and line outputs
32kHz
microphone
record
Inputs: Stereo external microphones
Outputs: Digital audio on S/PDIF OUT
Analog
playback
Inputs: Analog line inputs
Outputs: Stereo headphones and line outputs
48kHz digital
audio loopback
through
on-board
jumper JU1
Inputs: Analog line inputs
Loopback: I2S digital audio output
connected to I2S input operating at 48kHz
stereo audio mode
Outputs: Stereo headphones and line outputs
(on JU1, remove the shunts on row 6 and row
7 and connect pin 17 to pin 20 directly)
32kHz
microphone
digital loopback
Inputs: Stereo external microphones
Loopback: I2S digital audio output
connected to I2S input operating at 32kHz
stereo audio mode
Outputs: Stereo headphones and line outputs
(on JU1, remove the shunts on row 6 and row
7 and connect pin 17 to pin 20 directly)
48kHz digital
audio loopback
through onboard S/PDIF
transceivers
Inputs: Analog line inputs
Loopback: I2S digital audio output
transmitted and received through on-board
S/PDIF transceivers operating at 48kHz
stereo audio mode
Outputs: Stereo headphones and line outputs
Launch Wizard Menu
Click on the Launch Wizard menu item shown in
Figure 3 to launch the setup wizard and let the software
configure the EV kit automatically.
Figure 8. MAX9856 Evaluation Software (MAX9856 Register
View Window)
Presets Menu
Click on the Presets menu item shown in Figure 3 to
access seven preconfigured operating modes for the
EV kit. These presets quickly configure the MAX9856 in
the operating mode listed in Table 1. Once a preset
has been selected, use the main interface to optimize
the settings as desired.
Power Management Tab
The Power Management tab (Figure 9) controls the
MAX1799 power-management IC on the EV kit. Move
the DVDD track bar to adjust the supply voltage for
DVDD on the MAX9856. Move the AVDD track bar to
adjust the supply voltage for AVDD and CPVDD on the
MAX9856.
Check the CODEC Power Enable checkbox to turn on
the MAX9856.
_______________________________________________________________________________________
9
Evaluates: MAX9856
Table 1. EV Kit Preset Configurations
Evaluates: MAX9856
MAX9856 Evaluation Kit
Figure 9. MAX9856 Evaluation Software (Power Management Tab)
Clock Setup Tab
DAC Tab
The Clock Setup tab (Figure 10) controls the master
clock source for the MAX9856. Choose Recovered
Master Clock (10MHz - 60MHz) when recovered clock
from the S/PDIF receiver is used as the MAX9856 master clock. The master clock can also be chosen from
the on-board 12MHz crystal or from an external clock
applied on SMA connector J10. When an external master clock is selected, the user should type the exact
value of the external supplied clock frequency in the
Frequency edit box and then click the Set button.
The MAX9856 Operation Mode group box puts the
MAX9856 into either master or slave mode.
The DAC tab (Figure 11) controls the functionality of the
left- and right-channel DACs on the MAX9856.
The DACs can be shut down if they are not used. The
right-channel DAC can only be enabled when the leftchannel DAC is enabled. If the left DAC is disabled, the
right DAC is disabled as well.
10
Check the LRCLK_D Invert checkbox or the BCLK
Invert checkbox to invert the waveform of the LRCLK or
BCLK clock line on the I2S input interface. DAC modulation rate can be selected by clicking the Modulator
Rate drop-down list. Check the DAC Data Delay
checkbox to delay audio data one BCLK cycle after the
frame clock. Check the PCM Mode (Both DAC & ADC)
checkbox to set digital audio data in PCM format for
______________________________________________________________________________________
MAX9856 Evaluation Kit
Evaluates: MAX9856
Figure 10. MAX9856 Evaluation Software (Clock Setup Tab)
Figure 11. MAX9856 Evaluation Software (DAC Tab)
______________________________________________________________________________________
11
Evaluates: MAX9856
MAX9856 Evaluation Kit
both the DACs and ADCs. (Note: The on-board S/PDIF
transmitter and receiver do not support PCM mode.)
The High Sample Rate Mode checkbox is automatically checked if DAC sample rate is greater than 50kHz.
Click on the Word Size (Both DAC & ADC) drop-down
list to select the DAC and ADC resolution to 16 or 18
bits per sample.
When the MAX9856 is in master mode, the DPLLEN bit
is always set to 0. When the MAX9856 is in slave mode,
the DPLLEN bit can be set to 1 or 0 by either checking
or unchecking the DAC PLL Enable checkbox.
DAC sample rate can be selected by clicking the DAC
Sample Rate drop-down list.
ADC Tab
The ADC tab (Figure 12) controls the functionality of the
left- and right-channel ADCs on the MAX9856.
The ADCs can be shut down if they are not used. The
right-channel ADC can only be enabled when the leftchannel ADC is enabled. If left ADC is disabled, the
right ADC is disabled as well.
Check the LRCLK_A Invert checkbox or BCLK Invert
checkbox to invert the waveform of the LRCLK or BCLK
clock line on the I2S output interface. Click LRCLK_A
Pin Configuration drop-down list to select the
LRCLK_A pin functionality. If the ADCs do not share the
same sample frequency with the DACs, the ADCs’
sample frequency can be set separately. When the
Figure 12. MAX9856 Evaluation Software (ADC Tab)
12
______________________________________________________________________________________
MAX9856 Evaluation Kit
The ADC Output Gain and the ADC Noise Gate
Threshold can be set by moving their respective track
bars.
Digital Filters Tab
The MAX9856 includes digital first-order highpass filters
for both the DACs input and the ADCs output. Based on
the sample frequencies selected, the DAC Input -3dB
Cutoff Frequency and the ADC output -3dB Cutoff
Frequency can be set by moving their respective track
bars (Figure 13).
Figure 13. MAX9856 Evaluation Software (Digital Filters Tab)
______________________________________________________________________________________
13
Evaluates: MAX9856
ADCs share the same sample frequency with the
DACs, the LRCLK_A pin can be used as a general-purpose IO (GPIO) pin. Check the ADC Data Delay checkbox to delay audio data one BCLK cycle after the frame
clock. The PCM mode and word size control registers
apply to both the ADCs and the DACs.
When the MAX9856 is in master mode, the APLLEN bit
is always set to 0. When the MAX9856 is in slave mode,
the APLLEN bit can be set to 1 or 0 by checking or
unchecking the ADC PLL Enable checkbox.
Evaluates: MAX9856
MAX9856 Evaluation Kit
MIC AGC Tab
Audio Inputs Tab
On the MIC AGC tab (Figure 14), the AGC Release
Time, Attack Time, Hold Time, AGC & Noise Gate
Signal Source, and AGC Signal Threshold can be
configured. When AGC is enabled, the gain on the left
microphone channel is automatically monitored.
The MAX9856 includes various audio inputs and their
gains are programmable. The Digital Audio Input
PGA, AUXIN PGA, LINEIN1/LINEIN2 PGA, and
Left/Right MIC PGA are set by moving their respective
track bars, as shown in Figure 16.
Left and right microphone preamplifiers can be set in
the Left MIC Preamplifier and Right MIC Preamplifier
drop-down lists.
The microphones can be muted by checking the Mute
Left & Right MIC checkbox. The MICBIAS Voltage
can be selected from +1.5V or +2.4V (only when AVDD
v 2.7V). The left microphone input can be either a pseudo differential input (MICL/MICGND) or a differential
input (INLP/INLN), while the right microphone input can
only be a pseudo differential input (MICR/MICGND).
Analog Mixers Tab
The MAX9856 has two main analog mixers shown in
Figure 15. The Left/Right ADC Input Mixer can select
from AUXAC, LINEIN1, LINEIN2, MICL, and MICR. The
Left/Right Audio Output Mixer can select from MICL
PGA Output, MICR PGA Output, LINEIN1, LINEIN2,
DACL Output, and DACR Output.
Figure 14. MAX9856 Evaluation Software (MIC AGC Tab)
14
______________________________________________________________________________________
MAX9856 Evaluation Kit
Evaluates: MAX9856
Figure 15. MAX9856 Evaluation Software (Analog Mixers Tab)
Figure 16. MAX9856 Evaluation Software (Audio Inputs Tab)
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15
Evaluates: MAX9856
MAX9856 Evaluation Kit
Audio Outputs Tab
Headset Detect Tab
On the Audio Outputs tab (Figure 17), the Line
Output Enable checkbox can enable or disable the
line output.
The headphone can be muted by checking the Mute
Headphone checkbox. The gain of the headphones
can be set from -73.5dB to +6dB by moving the left or
the right headphone volume track bars.
Check the Volume Slewing Enable checkbox to give a
smooth sounding gain change. Check AUXIN DC
Measurement Enable to directly connect the AUXIN to
ADC input for DC measurement (JU5 must be closed).
The AUXIN signal can be directly mixed into the headphone amplifiers by checking the Mix AUXIN Directly
into the Headphone checkbox.
The headphone output mode can be set by selecting
the Headphone Output Mode drop-down list.
The Headset Detect tab (Figure 18) demonstrates how
a headset insertion or removal can be detected. The
state of popular headset jack pins can be measured to
configure the headset properly.
Check Enable Detect (0x1B, JDETEN) to activate the
headset-detection circuitry. The detection result is
reported in the Headset Presence group box.
If the Auto Read checkbox is checked, the software
automatically monitors the insertion and removal of a
headset and reports the result in the Headset
Presence group box. If there is a headset configuration
change, the software automatically detects the headset
impedance and reports the result in the Headset
Impedance group box.
Troubleshooting
The MAX9856 software automatically searches for all of
the on-board I2C devices. Any missing I2C device is
reported in a message window (Figure 19).
Figure 17. MAX9856 Evaluation Software (Audio Outputs Tab)
16
______________________________________________________________________________________
MAX9856 Evaluation Kit
Evaluates: MAX9856
Figure 18. MAX9856 Evaluation Software (Headset Detect Tab)
Figure 19. MAX9856 Evaluation Software (Missing I2C Device Message)
______________________________________________________________________________________
17
Detailed Description of Hardware
1
2
LINEIN2
C74
1μF
3
4
C36
1μF
INLN
INLP
33
32
31
DVDD
DGND
34
INLN
35
C45
1μF
C44
1μF
INLP
MICR
36
C43
1μF
MICL
37
C40
1μF
MICGND
38
C39
1μF
MICBIAS
AGND
C78
1μF
LINEIN1
39
JACKSNS
40
C38
1μF
EXTMICL
EXTMICGND
EXTMICR
C81
1μF
DVDD
signals to allow for easy connection with consumer
electronics devices.
Access the S/PDIF inputs though the RCA connector at
J12. Access the S/PDIF outputs through the RCA connector at J11. All S/PDIF connections function for sample rates from 32kHz to 96kHz. To transmit lower sample rates, connect a serial audio transmitter or receiver
directly to the MAX9856.
To connect the EV kit using optical cables, install
TOSLINK connectors on J13 and J14.
The MAX9856 EV kit is a complete digital audio evaluation system for the MAX9856 audio CODEC. The portion of the EV kit required to operate the MAX9856 is
shown in Figure 20. All additional components are
included to aid evaluations.
In addition to providing access to all MAX9856 audio
inputs and outputs, the EV kit provides translation of the
on-board serial digital audio signals to coaxial S/PDIF
MCLK
LINEIN1
LRCLK_A
LINEIN2
AUXIN
DVDDSS2
PREG
SDIN
30
29
DVDDS2
28
27
C85
1μF
U1
5
C35
1μF
C34
1μF
BCLK
24
R13
10kΩ
23
IRQ
LGNDSNS
SDA
LOUTL
11
12
13
14
15
16
17
18
19
22
21
CPVDD
C1P
CPGND
C1N
SCL
PVSS
LOUTR
SVSS
10
IRQ
HPR
9
REF
HPL
8
25
DVDDS2
AVDD
LOUTL
26
MBIAS
LRCLK_D
7
LOUTR
SDOUT
MAX9856
6
C33
1μF
NREG
HGNDSNS
20
AVDD
AVDD
C31
10μF
C30
4.7μF
HPR
C32
0.1μF
HPL
Evaluates: MAX9856
MAX9856 Evaluation Kit
C28
0.1μF
C27
10μF
C29
4.7μF
Figure 20. Minimum Required EV Kit Components
18
______________________________________________________________________________________
MAX9856 Evaluation Kit
JUMPER
JU1
JU2
JU4
JU5
JU6, JU7
JU8
SHUNT POSITION
1-2* (all rows)
Open (all rows)
External I2S interface and I2C interface
LRCLK_A used as GPIO
LRCLK_A used as ADC LRCLK
Open
JACKSNS pin connected to the headphone jack pin 4
JACKSNS pin has no connection
Connected*
DC-coupled AUXIN
Open
AC-coupled AUXIN
Connected*
Open
Connected*
Connected*
Open
JU10
On-board I S interface and I2C interface
1-2
Open
JU9
DESCRIPTION
2
2-3*
Connected*
Connected*
Open
Evaluates: MAX9856
Table 2. EV Kit Jumper Settings
Internal microphone biased by MICBIAS
No bias applied on internal microphone inputs
DVDD connected to the MAX1799 OUT2
DVDD ranges from 1.8V to 3.3V
External DVDD can be applied on the DVDD pad
AVDD connected to the MAX1799 OUT3
AVDD ranges from 1.8V to 3.3V
External AVDD can be applied on the DVDD pad
DVDDS2 connected to the MAX1799 OUT1
DVDDS2 is fixed at 3.3V
External DVDDS2 can be applied on the DVDDS2 pad
*Default position.
Access the analog line inputs through RCA connectors
at J6 and J7. Access the analog line outputs through
RCA connectors at J4 and J5.
Connect headphones to the DirectDrive headphone
output of the MAX9856 through the 3.5mm headphone
jack (J3). Connect external microphones through the
3.5mm microphone jack (J8).
The remaining inputs and outputs of the MAX9856 are
accessible through pads on the right and bottom sides
of the EV kit.
See Table 2 for a description of all EV kit jumper
configurations.
Power Management
The USB host supplies 5V power to the MAX1799.
When the EV kit is connected to a PC, the MAX1799
generates a 3V output on the OUT1 pin so that all the
I2C interfaces on the board are working. After the software is running, the DVDD and AVDD can be configured to power the MAX9856.
See Table 3 for a listing of each EV kit supply.
Table 3. EV Kit Power Supplies
EV KIT SUPPLY
DESCRIPTION
MAX1799 PMIC
Input: VUSB from USB host
Output: VMOD, VVCO, DVDD, AVDD
VMOD, VVCO
3.3V supply that powers every IC except
the MAX9856
DVDD
1.8V to 3.3V supply that powers DVDD on
the MAX9856
AVDD
1.8V to 3.3V supply that powers AVDD and
CPVDD on the MAX9856
DVDDS2
Digital audio interface I/O power supply for
the MAX9856
______________________________________________________________________________________
19
Evaluates: MAX9856
MAX9856 Evaluation Kit
Differential (Internal)
Microphone Connection
R22 and R44 provide microphone bias connections for
the internal differential microphone input. Remove the
shunts on JU6 and JU7 to remove the microphone bias.
Stereo (External) Microphone Connection
R16 and R17 provide external left and right microphone
bias. Use the EXTMICGND pin for the ground connection of all microphones connected to this interface.
Control and Data Interface
JU1 connects the MAX9856 digital I/O pins to the rest
of the EV kit. For normal operation, install a shunt
across pins 1-2 of each row of JU1 (Figure 21).
Remove shunts as necessary to connect equipment or
other components directly to the MAX9856. Pin 3 of
each row provides a clean connection to the digital
ground plane of the EV kit for grounding test leads.
Place a shunt between pin 2 of SDIN and pin 2 of
SDOUT to place the digital audio interface in loopback
mode. This process routes data from the ADC directly
back into the DAC for testing purposes.
Clocking
On-Board Clock
The MAX9856 EV kit features an on-board 12MHz crystal
clock oscillator to provide the necessary master clock
for the MAX9856.
Recovered Clock
When S/PDIF IN has digital audio input and the S/PDIF
receiver is in operation, the recovered clock from the
S/PDIF receiver can be used as the master clock for
the MAX9856.
External Clocks
Connect an external clock source to the SMA connector (J10) to drive the MAX9856’s MCLK pin without
using the on-board oscillator. When using an external
clock, the User Provided Clock (10MHz – 60MHz)
option must be selected on the Clock Setup tab
(Figure 10). The user must type in the correct clock frequency in the Frequency edit box. Populate R21 and
C49 as appropriate to provide termination for the
incoming signal.
Using an Alternative I2C Interface
Connect an I2C master to the SDA and SCL pads of the
MAX9856 EV kit to communicate with the I 2C parts
without using the on-board I2C signals generated by
the microcontroller (U2).
See Table 4 to determine the I2C address of each device
on the EV kit. All I2C addresses are fixed in hardware.
Table 4. I2C Addresses
DEVICE
MAX9856 (U1)
MAX1799 (U3)
MAX1609 (U11)
CS8406 (U15)
CS8416 (U16)
I2C ADDRESS
0010 000
0111 111
0100 100
0010 011
0010 100
Figure 21. Header JU1
20
______________________________________________________________________________________
MAX9856 Evaluation Kit
Evaluates: MAX9856
Figure 22a. MAX9856 EV Kit Schematic (Sheet 1 of 6)
______________________________________________________________________________________
21
Evaluates: MAX9856
MAX9856 Evaluation Kit
Figure 22b. MAX9856 EV Kit Schematic (Sheet 2 of 6)
22
______________________________________________________________________________________
MAX9856 Evaluation Kit
Evaluates: MAX9856
Figure 22c. MAX9856 EV Kit Schematic (Sheet 3 of 6)
______________________________________________________________________________________
23
Evaluates: MAX9856
MAX9856 Evaluation Kit
Figure 22d. MAX9856 EV Kit Schematic (Sheet 4 of 6)
24
______________________________________________________________________________________
MAX9856 Evaluation Kit
Evaluates: MAX9856
Figure 22e. MAX9856 EV Kit Schematic (Sheet 5 of 6)
______________________________________________________________________________________
25
Evaluates: MAX9856
MAX9856 Evaluation Kit
Figure 22f. MAX9856 EV Kit Schematic (Sheet 6 of 6)
26
______________________________________________________________________________________
MAX9856 Evaluation Kit
Evaluates: MAX9856
Figure 23. MAX9856 EV Kit Component Placement Guide—Component Side
______________________________________________________________________________________
27
Evaluates: MAX9856
MAX9856 Evaluation Kit
Figure 24. MAX9856 EV Kit PCB Layout—Component Side
28
______________________________________________________________________________________
MAX9856 Evaluation Kit
Evaluates: MAX9856
Figure 25. MAX9856 EV Kit PCB Layout—Inner Layer 2
______________________________________________________________________________________
29
Evaluates: MAX9856
MAX9856 Evaluation Kit
Figure 26. MAX9856 EV Kit PCB Layout—Inner Layer 3
30
______________________________________________________________________________________
MAX9856 Evaluation Kit
Evaluates: MAX9856
Figure 27. MAX9856 EV Kit PCB Layout—Solder Side
______________________________________________________________________________________
31
Evaluates: MAX9856
MAX9856 Evaluation Kit
Revision History
REVISION
NUMBER
REVISION
DATE
DESCRIPTION
PAGES
CHANGED
0
6/08
Initial release
—
1
3/10
Replaced Figure 17
16
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
32 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2010 Maxim Integrated Products
Maxim is a registered trademark of Maxim Integrated Products, Inc.
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