19-3423; Rev 3; 3/09
MAX9850 Evaluation System/Evaluation Kit
General Description
The MAX9850 evaluation system (EV system) consists
of a MAX9850 evaluation kit (EV kit), a companion
Maxim command module (CMOD232) interface board,
and software.
The MAX9850 EV kit is a fully assembled and tested
surface-mount printed circuit board (PCB) that evalu-
ates the MAX9850 headphone stereo DAC with inte-
grated headphone driver. The EV kit is designed to be
driven by any digital audio Sony/Philips Digital Interface
(S/PDIF) audio source and can be optionally configured
to accept generic digital audio or I
2
S-compatible sig-
nals. The EV kit provides RCA jacks for connecting ana-
log input signals. A 3.5mm headphone jack allows for
easy connection of headphones to the PCB.
The Maxim command module interface board
(CMOD232) allows a PC to use its serial port to emulate
an I
2
C 2-wire interface. Windows
®
98/2000/XP-compati-
ble software, which can be downloaded from the
Maxim website, provides a user-friendly interface to
exercise the features of the MAX9850. The program is
menu driven and offers a graphical user interface (GUI)
with control buttons and a status display.
The MAX9850 EV system (MAX9850EVCMOD2#)
includes both the EV kit and the CMOD232 interface
board. Order the MAX9850 EV kit (MAX9850EVKIT#) if
you already have a command module interface.
Windows is a registered trademark of Microsoft Corp.
Features
♦
1.8V to 3.6V Single-Supply Operation
♦
I
2
C-Compatible 2-Wire Serial Interface
♦
Selectable Optical/Electrical S/PDIF Input
♦
On-Board 12MHz Crystal Oscillator
♦
On-Board Digital Audio Receiver
♦
No Detectable Clicks or Pops
♦
Easy-to-Use Menu-Driven Software
♦
Assembled and Tested
♦
Includes Windows 98/2000/XP-Compatible
Software and Demo PCB
Evaluate: MAX9850
Ordering Information
PART
MAX9850EVKIT#
I
2
C
IC
INTERFACE
PACKAGE
TYPE
0°C to +70°C 28 TQFN
Not included
TEMP
RANGE
CMOD232
MAX9850EVCMOD2#
0°C to +70°C 28 TQFN
#Denotes
RoHS compliant.
Note:
The CMOD232 board is required to interface the EV kit to
the computer when using the software.
Component Lists
MAX9850 EV System
PART
MAX9850EVKIT#
CMOD232+
AC Adapter
QTY
1
1
1
DESCRIPTION
MAX9850 EV kit
SMBus/I
2
C interface board
9VDC at 200mA
(powers the CMOD232 board)
MAX9850 EV Kit (continued)
DESIGNATION
C5–C8
C9–C12, C15–
C23, C30, C31,
C37, C43
C13
QTY
4
DESCRIPTION
10μF ±20%, 6.3V X5R ceramic
capacitors (0805)
TDK C2012X5R0J106M
1.0μF ±20%, 6.3V X5R ceramic
capacitors (0402)
TDK C1005X5R0J105M
2.2μF ±20%, 6.3V X5R ceramic
capacitor (0603)
TDK C1608X5R0J225M
0.47μF ±20%, 16V X7R ceramic
capacitor (0603)
TDK C1608X7R1C474M
0.1μF ±20%, 10V X5R ceramic
capacitors (0402)
TDK C1005X5R1A104M
17
#Denotes
RoHS compliant.
+Denotes
lead-free and RoHS compliant.
MAX9850 EV Kit
DESIGNATION
QTY
DESCRIPTION
220μF ±20%, 6.3V tantalum
capacitors (C-case)
AVX TPSC227M006R0070 or
AVX TPSC227M006R0100
Not installed, capacitors (C-case)
1
C14
1
C1, C2
C3, C4
2
0
C24–C29, C35,
C44, C45
9
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
MAX9850 Evaluation System/Evaluation Kit
Evaluate: MAX9850
Component Lists (continued)
DESIGNATION
C32, C33, C34,
C36, C38, C39
QTY
6
DESCRIPTION
0.01µF ±5%, 25V C0G ceramic
capacitors (0603)
TDK C1608C0G1E103J
0.022µF ±10%, 25V X7R ceramic
capacitor (0402)
TDK C1005X7R1E223K
1000pF ±5%, 50V C0G ceramic
capacitor (0603)
TDK C1608C0G1H102J
Not installed (0603)
2 x 10 right-angle female receptacle
Digital audio optical receiver
Toshiba TORX147L
Phono jacks, red
Phono jacks, white
Phono jack, yellow
Switched stereo headphone jack
(3.5mm dia)
SMA PC-mount connector
8-pin header
Dual-row 6-pin header
2-pin header
3-pin header
3.3µH ±10%, 270mA inductor (1812)
Coilcraft 1812CS-332XKL
47µH ±10%, 200mA inductor (1812)
Coilcraft 1812LS-473XKL
1k
47k
75
±5% resistors (0603)
±5% resistor (0603)
±5% resistor (0603)
—
—
3
1
U8
1
U6, U7
2
U5
1
U3
1
DESIGNATION
R11
R14
R15
SW1
U1
QTY
1
0
1
0
1
DESCRIPTION
3.01kΩ ±1% resistor (0603)
Not installed, resistor—short (PC
trace) (1206)
4.7kΩ ±5% resistor (0603)
Not installed
Stereo audio DAC (28 TQFN)
Maxim MAX9850ETI+
192kHz digital audio receiver
(28 TSSOP)
Cirrus Logic CS8416-CZZ
Level translator (10 µMAX
®
)
Maxim MAX1840EUB+
16-bit, dual-supply bus transceiver
(48 TSSOP)
Texas Instruments
SN74AVCAH164245GR
Dual/triple voltage
microprocessor
supervisor (5 SC70)
(Top Mar
k:
AFS)
Maxim MAX6736XKTGD3+
2:1 noninverting
multiplexers
(6 SC70)
Fairchild Semi NC7SV157P6X_NL
(Top Mark: VF7)
Schmitt trigger buffer (5 SC70)
Fairchild Semi NC7SV17P5X_NL
(Top Mark: V17)
Low-jitter crystal clock oscillator
CTS Frequency Controls
CB3LV-3C-12.0000-T
Shunts
PCB: MAX9850 Evaluation Kit#
C40
1
C41
C42
J1
J2
J3, J5
J4, J6
J7
J8
J9
J10
JU1
JU2
JU3
L1
L2
R1, R2, R3, R13
R4
R5
R6, R7, R8,
R12
R9, R10
1
0
1
1
2
2
1
1
1
1
1
1
1
1
1
4
1
1
0
2
U2
1
U4
1
Y1
1
Not installed, resistors (0603)
1k
±5% resistors (0402)
#Denotes
RoHS compliant.
Component Suppliers
SUPPLIER
AVX Corp.
Coilcraft, Inc.
TDK Corp.
PHONE
843-946-0238
847-639-6400
847-803-6100
FAX
843-626-3123
847-639-1469
847-390-4405
WEBSITE
www.avxcorp.com
www.coilcraft.com
www.component.tdk.com
Note:
Indicate that you are using the MAX9850 when contacting these component suppliers.
µMAX is a registered trademark of Maxim Integrated Products, Inc.
2
_______________________________________________________________________________________
MAX9850 Evaluation System/Evaluation Kit
MAX9850 EV Kit Files
FILE
INSTALL.EXE
MAX9850.EXE
UNINST.INI
Application program
Uninstalls the EV kit software
DESCRIPTION
Installs the EV kit files on your computer
Evaluate: MAX9850
Quick Start
Recommended Equipment
• Computer running Windows 98, 2000, or XP
• Serial port (this is a 9-pin socket on the back of the
computer)
• Standard 9-pin, straight-through, male-to-female
cable (serial extension cable) to connect the com-
puter’s serial port to the Maxim command module
interface board
• CMOD232 command module with included wall
cube power source
• Two 3.0V/100mA DC power supplies
• One pair of headphones (16Ω or greater)
• One digital audio S/PDIF signal source
Procedure
The MAX9850 EV kit is fully assembled and tested.
Follow the steps below to verify board operation.
Caution: Do not turn on the power supply until all
connections are completed.
1)
2)
3)
4)
Command Module Setup
Enable the SDA/SCL pullup resistors on the com-
mand module by setting both switches (SW1) to the
on position.
Set the command module working voltage to 3.3V
by placing a shunt across pins 1-2 of the VDD
select jumper.
Connect a cable from the computer’s serial port to
the command module (CMOD232) interface board.
Use a
straight-through
9-pin male-to-female cable.
To avoid damaging the EV kit or your computer, do
not use a 9-pin null-modem cable or any other pro-
prietary interface cable that is physically similar to
the straight-through cable.
Connect the provided wall cube power supply to
the CMOD232 board.
EV Kit Setup
1) Visit
www.maxim-ic.com/evkitsoftware
to down-
load the latest version of the EV kit software,
9850Rxx.ZIP. Save the EV kit software to a tempo-
rary folder and uncompress the ZIP file.
2) Install the EV kit software on your computer by run-
ning the INSTALL.EXE program inside the tempo-
rary folder. The program files are copied and icons
are created in the Windows
Start | Programs
menu.
3) Ensure that the I
2
C address of the MAX9850 is set
to 0x20h by verifying that a shunt is placed across
pins 1-2 of jumper JU1.
4) Ensure that a shunt is installed on jumper JU2
5) Connect the first 3.0V power supply to the DVDD
and corresponding GND pads.
6) Connect the second 3.0V power supply to the
PVDD and corresponding GND pads.
7) Connect the S/PDIF signal source to either J2 (opti-
cal) or J7 (electrical)
8) Insert a pair of 16Ω headphones into the head-
phone jack J8.
9) Carefully align the 20-pin connector of the
MAX9850 EV kit with the 20-pin header of the
CMOD232 interface board. Gently press them
together.
10) Plug the CMOD232 wall cube into an electrical outlet.
11) Turn on both of the 3.3V power supplies
12) Enable the stereo audio sources.
13) Start the MAX9850 program by opening its icon in
the
Start | Programs
menu.
14) Normal device operation can be verified by
the “Status: MAX9850 Operational” text in the
Interface box.
15) To autoconfigure the MAX9850 in a functional state,
use the “auto setup” feature in the MAX9850 software.
_______________________________________________________________________________________
3
MAX9850 Evaluation System/Evaluation Kit
Evaluate: MAX9850
Figure 1. MAX9850 EV Kit Software Main Window
Detailed Description
of Software
Note:
Words in bold are user-selectable features and
status flags in the software.
User-Interface Panel
The user interface (Figure 1) is easy to operate; use the
mouse, or a combination of the Tab and Arrow keys to
manipulate the software. Each of the buttons corre-
sponds to bits in the command and configuration
bytes. By clicking on them, the correct I
2
C write opera-
4
tion is generated to update the internal registers of the
MAX9850 or the on-board S/PDIF receiver.
The software divides EV kit functions into logical
blocks. The
Interface
box indicates the current
Device
Address,
the
Register Address Sent,
and the
Data
Sent/Received
for the last read/write operation. This
data is used to confirm proper device operation.
Headphone, Power, Clock Setup, Digital Audio/
Configuration,
and
Receiver
functions are accessed
through tab sheets. MAX9850 status and interrupt con-
trol are accessed through the
MAX9850 Status
box.
_______________________________________________________________________________________
MAX9850 Evaluation System/Evaluation Kit
The status bar displays vital MAX9850 clock information.
Return the EV kit to its power-on-reset state by clicking
the
POR Reset
button. Power up the MAX9850 by
clearing the
MAX9850 Global Shutdown
checkbox.
Power up the receiver (U2) by selecting the
Receiver
Enabled
checkbox.
The MAX9850 EV kit software features additional func-
tions to simplify operation.
Automatic Diagnostics
probes the command module board and the MAX9850
EV kit to make sure that all connections are made, and
all devices are working. This will create some activity
on the I
2
C bus. The
Silence I2C-bus Activity
check-
box will reduce I
2
C bus activity to allow easy triggering
of an oscilloscope.
The
Auto Setup
button further reduces user input. When
this button is pressed, the software will do the following:
1) Search both EV kit S/PDIF inputs for a valid signal
and then set the on-board multiplexer accordingly.
2) Power up the receiver IC as well as vital sections of
the MAX9850.
3) Set internal clock dividers based on the incoming
master clock frequency.
4) Set the MSB(14:8) and LSB(7:0) bits based on the
desired mode of operation.
5) Set the charge-pump clock division bits if the
MAX9850 is not using the internal oscillator.
The
Auto Setup
button is intended to simplify user
interaction by placing the EV kit into a known-good
mode of operation.
Evaluate: MAX9850
MAX9850 Status/Interrupt
The MAX9850 EV kit software defaults to a state that
continually polls the device for new status data and
monitors the alert conditions. The contents of the status
register are displayed in the
MAX9850 Status
group
box (Figure 2). Changes in the GPIO state, PLL lock,
headphones present, volume, and output overload can
be set to trigger an interrupt by checking the check-
box next to the desired information.
To disable continuous polling of data, uncheck the
Automatic Status Read
checkbox (Figure 1). Force a
manual status register read by clicking the
Read
Status
button.
If an interrupt condition is generated, the message
INTERRUPT
appears next to the interrupt status label.
If enabled, the program will disable automatic reading
of the status register.
Status Bar
The status bar (Figure 3) displays the MAX9850 master
clock, internal clock, and charge-pump clock frequen-
cies. By default it is updated automatically; however, this
feature can be turned off (see the
Clock Setup
section).
Headphone Control
The Headphones tab (Figure 1) allows access to the
MAX9850 headphone-related controls.
Headphone volume can be adjusted in dB increments by
adjusting the
Volume Control
slider. The dB increments
are not evenly spaced and are detailed further in the
MAX9850 data sheet. Alternatively, a number can be
entered in the box below the
Volume Control
slider. If a
number that does not match a predefined dB increment
is entered, the software automatically rounds the number
to the nearest valid dB increment and sends the appro-
priate I
2
C data to the MAX9850. Mute the HP output by
selecting the
Mute
checkbox.
Additional headphone control is also provided through
the
Headphone Features
box.
Slew Rate Control
is
controlled through the respective check and drop-
Figure 2. MAX9850 EV Kit Software Status Window
Figure 3. MAX9850 EV Kit Software Status Bar
_______________________________________________________________________________________
5
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