General Description
The MAX3674 evaluation kit (EV kit) is a fully assembled
and tested demonstration board that simplifies evalua-
tion of the MAX3674 high-performance dual-output net-
work clock synthesizer. The EV kit includes a 16MHz
crystal and other hardware components necessary to
evaluate all the MAX3674 functions. Software is provid-
ed that communicates with the EV kit through a USB
port. The software provides an easy way to set opera-
tional modes and read/write internal registers. The EV
kit is powered by a +3.3V supply and USB port. SMA
connectors are used for the reference clock input and
LVPECL clock outputs to simplify connection to test
equipment. Two LEDs indicate the status of LOCK and
USB power.
Features
♦Fully Assembled and Tested
♦On-Board 16MHz Crystal Reference
♦Software Control Through USB Port
♦SMA Connectors for Clock I/Os
♦Powered by +3.3V Supply and USB Port
♦Indicators for LOCK and USB Power
Evaluates: MAX3674
MAX3674 Evaluation Kit
________________________________________________________________
Maxim Integrated Products
1
19-4156; Rev 0; 5/08
Component List
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.
Ordering Information
DESIGNATION QTY DESCRIPTION
C1, C2 2 33pF ±10% ceramic capacitors
(0402)
C3, C4 0 Not installed
C5, C18, C20,
C21, C22, C24,
C26, C28, C29,
C31, C33
11 0.1μF ±10% ceramic capacitors
(0603)
C6, C34 2 22μF ±10% ceramic capacitors
(1206)
C7, C14, C41,
C42 40.22μF ±10% ceramic capacitors
(0402)
C8, C9, C11,
C12, C13, C40,
C47, C48
80.1μF ±10% ceramic capacitors
(0402)
C10 1
0.01μF ±10% ceramic capacitor
(0402)
C15, C16, C19,
C32 44.7μF ±10% ceramic capacitors
(0805)
C17, C23, C25,
C27, C30 51μF ±10% ceramic capacitors
(0603)
C35 1
0.01μF ±10% ceramic capacitor
(0603)
D1, D2 2 LEDs, green
Panasonic LN38GPX
J1 1
Mini USB connector, B type
Tyco 1734035-1
DESIGNATION QTY DESCRIPTION
J5 1
2 x 3 pin header (0.1in centers)
Sullins PEC36SAAN
J6, J7 2 Test points
Keystone 5000
J10–J13 4
SMA connectors, edge-mount,
tab center
Johnson 142-0701-851
J17 1
SMA connector, PCB mount
Johnson 142-0701-231
L1 1
22μH ±20% inductor, 520mA
Taiyo-Yuden CBC3225T220M
L2 1
4.7μH ±20% inductor, 870mA
Taiyo-Yuden CBC3225T4R7M
L4–L7 4
Ferrite beads
Murata BLM18HK102SN1 (0603)
R1, R21 2 49.9±1% resistors (0603)
R2 1 10±1% resistor (0603)
R3 1 470±1% resistor (0603)
R4, R6–R11 7 4.75k±1% resistors (0603)
R5 1 1.5k±1% resistor (0603)
R12, R13, R22,
R23 4 10k±1% resistors (0603)
R24 1 680±1% resistor (0603)
R25–R28 4 143±1% resistors (0603)
R34, R35 2 4.99k±1% resistors (0603)
PART TYPE
MAX3674EVKIT+ EV Kit
+
Denotes lead-free/RoHS-compliant.
EVALUATION KIT AVAILABLE
Evaluates: MAX3674
MAX3674 Evaluation Kit
2 _______________________________________________________________________________________
Component List (continued)
DESIGNATION QTY DESCRIPTION
TP1–TP7, TP10 8 Test points
Keystone 5000
U1 1
High-performance dual-output
network clock synthesizer
(48 LQFP)
Maxim MAX3674ECM+
U2 1
Microcontroller (28 SO)
Microchip PIC16C745-I/SO
U3 1
Dual level translator (8 SOT23)
Maxim MAX3373EEKA+
U4 1
I/O port expander (24 TQFN)
Maxim MAX7312ATG+
DESIGNATION QTY DESCRIPTION
U5 1
Buffer (5 SC-70)
Fairchild NC7SV125P5X
Y1 1
16.000MHz SMD crystal, 18pF
Citizen HCM49-16.000MABJ-UT
Y2 1
6.000MHz SMD crystal, 32pF
ECS ECS-60-32-5PXDN-TR
None 2
Shunts for J5
Sullins SSC02SYAN
None 1
PCB: MAX3674 EV Kit+ Circuit
Board, Rev A
Quick Start
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.
1) Install two shunts on jumper J5, both to the (L) posi-
tion. This sets address pins ADR0 and ADR1 low.
2) Connect a +3.3V supply to VCC (J6) and GND (J7).
Set the supply current limit to 200mA.
3) Connect the computer to the EV kit with a USB
cable (A-Male to Mini-B-Male). LED D2 should
switch on, indicating that USB power is detected.
4) To download the latest version of the EV kit software
(MAX3674revX.zip), visit the Maxim website at
www.maxim-ic.com/evkitsoftware. Uncompress
the zip file to a local folder and run the installation
file (setup.exe). Installation requires administrative
rights and may also require Internet access to
download necessary drivers.
5) After installation is complete, follow this path to start
the program: Start →All Programs →Maxim
Integrated Products →MAX3674 Evaluation Kit
6) Press the Initialize / Test Communication button.
The message box should report:
USB Device Detected
MAX3674 Detected
MAX7312 Detected
7) Press the following buttons in this order: RESET →
LOAD →READ. At this point, the LOCK output
should be high (LED D1 on), indicating that the PLL
is locked.
8) Set the values for P, NA, NB, and Mto obtain the
desired output frequency.
9) Press the LOAD button, followed by the READ button.
10) Connect the clock outputs (QA, QA, QB, QB) to test
equipment with SMA cables. Terminate unused out-
puts.
Windows is a registered trademark of Microsoft Corp.
Microsemi MAX3674ECM+
4) To download the latest version of the EV kit software
the Microsemi website at www.microsemi.com.
Uncompress the zip file to a local folder and run the
installation file (setup.exe). Installation requires
administrative rights and may also require Internet
access to download necessary drivers.
Detailed Description
The MAX3674 EV kit simplifies evaluation by providing
the hardware and software needed to evaluate all the
MAX3674 functions. A microcontroller (Microchip
PIC16C745) and I/O port expander (MAX7312) allow
the user to set control pins and read/write registers with
software. The on-board 16MHz crystal and integrated
oscillator generate the PLL reference clock.
Alternatively, an external clock source can be connect-
ed to the REF_CLK input to serve as the reference
clock. LED D1 switches on when the LOCK output is
high, indicating the PLL is locked.
The microcontroller is powered by the USB port +5V
supply. LED D2 switches on when USB power is
detected. The MAX3674 and I/O port expander are
powered by the +3.3V supply. The EV kit also includes
the MAX3373 level translator that interfaces the I2C
clock and data lines from the microcontroller to the
MAX3674 and I/O port expander, and is powered by
both supplies. The USB cable and +3.3V supply can
be connected to the EV kit in any sequence.
Master Reset
It is recommended to press the RESET button after
every power-up.
LVPECL Clock Outputs
The LVPECL clock outputs (QA, QA, QB, QB) have on-
board bias-Ts that provide DC biasing and AC-couple
the signal to allow direct connection to 50Ω-terminated
test equipment. Unused outputs should be terminated
to prevent reflections on the transmission lines.
Reference Clock Input
The REF_CLK input (J17) accepts sinusoidal or square-
wave clocks with frequencies between 15MHz and
20MHz, and swings up to 3.3VP-P. This input has a 50Ω
DC termination to ground and is AC-coupled to an on-
board buffer. The buffer is used to square the clock
signal applied to the REF_CLK input pin.
I2C Slave Address
Jumper J5 is used to set the two selectable address
bits (ADR0 and ADR1). The EV kit software performs a
search at power-up to determine which of the four pos-
sible slave addresses is being used.
EV Kit Software
The EV kit software provides an easy way to set opera-
tional modes and read/write internal registers
(Figure 1). Refer to the MAX3674 data sheet for
detailed descriptions of the MAX3674 functions and
guidance on selecting dividers settings. Note that when
the Programming Interface is set to I2C, the settings
for dividers P, NA, NB, and Mare configured within the
MAX3674 after pressing the LOAD button.
Evaluates: MAX3674
MAX3674 Evaluation Kit
_______________________________________________________________________________________ 3
Evaluates: MAX3674
MAX3674 Evaluation Kit
4 _______________________________________________________________________________________
Figure 1. MAX3674 EV Kit Software
Evaluates: MAX3674
TP5
TP3
TP6
LED
D2
USB_PWR
21
TP10TP7
TP2
CLK_STOPB
TP4
CLK_STOPA
1VCC
2BYPASS
TP1
3GND
4VCC
5VCC_PLL
6REF_SEL
7REF_CLK
8GND
9CLK_STOPA
10 CLK_STOPB
11 XTAL1
12 XTAL2
1I/O0
2I/O1
3I/O2
4I/O3
5I/O4
6I/O5
7I/O6
8I/O7
9GND
10 I/O8
11 I/O9
12 I/O10
36
VCC
25
TEST_EN
26
LOCK
27
GND
28
QB
29
QB
30
VCC
31
GND
32
QA
33
QA
34
VCC
35
NB
18
AD0
17
I/O15
16
I/O14
15
I/O13
14
I/O12
13
I/O11
24
AD2
23
AD1
22
INT
21
V+
20
SDA
19
SCL
C41
0.22μF
C42
0.22μF
C47
0.1μF
C9
0.1μF
C8
0.1μF
C13
0.1μF
C12
0.1μF
C11
0.1μF
R24
680Ω
R5
1.5kΩ
R2
10Ω
R23
10kΩ
R22
10kΩ
R6
4.75kΩ
R7
4.75kΩ
R8
4.75kΩ
R9
4.75kΩ
R10
4.75kΩ
R11
4.75kΩ
R12
10kΩ
R13
10kΩ
R3
470Ω
R27
143Ω
L7
FERRITE BEAD
C33
0.1μF
C35
0.01μF
C31
0.1μF
C30
1μF
C4
OPEN
C3
OPEN
C10
0.01μF
C29
0.1μF
C40
0.1μF
C6
22μF
C21
0.1μF
C22
0.1μF
C32
4.7μF
C34
22μF
C19
4.7μF
C20
0.1μF
VCC
VCC
VCC
VCC
VCC
MAX3674
U1
MAX3373
U3
MAX7312
U4
1OE
2A
3GND
5
VCC
4
Y
C5
0.1μF
C48
0.1μF
Y1
16.0MHz
12
R34
4.99kΩ
R35
4.99kΩ
R1
49.9Ω
VCC
VCC U5
NC7SV125P5X
J17
SMAPCB
REF_CLK
13 VCC
14 M0
15 M1
16 M2
17 M3
18 M4
19 GND
20 M5
21 M6
22 M7
23 M8
24 M9
1MCLR
2RA0
3RA1
4RA2
5RA3
6RA4
28
RB7
U2
PIC16C745
27
RB6
26
RB5
25
RB4
24
RB3
23
RB2
22
RB1
21
RB0
20
VDD
19
VSS
18
RC7
17
RC6
16
15
D-
D+
7RA5
8VSS
9OSC1
10 OSC2
11 RC0
12 RC1
13 RC2
14 VUSB
R25
143Ω
L5
FERRITE BEAD
R28
143Ω
L6
FERRITE BEAD
R26
143Ω
L4
FERRITE BEAD
VCC
J12
J13
SMA
QB
SMA
QB
C7
0.22μF
C14
0.22μF
J10
J11
SMA
QA
SMA
QA
LED
D1
2
1
LOCK
LOCK
48
P
37
GND
38
NA2
39
NA1
40
NA0
41
PLOAD
42
VCC
43
MR
44
SDA
45
SCL
46
ADR1
47
ADR0
1VBUS
2D-
3D+
4NC
5GND
J1
MINI-B USB
1I/O VCC2
2GND
3VL
4I/O VL2
VUSB
VUSB
C24
0.1μF
C23
1μF
C26
0.1μF
C25
1μF
C28
0.1μF
C27
1μF
VCC
VCC
VCC VUSB
R4
4.75kΩ
C2
33pF
C1
33pF
Y2
6.0MHz
12
C18
0.1μF
C17
1μF
C15
4.7μF
C16
4.7μF
L1
22μH
VUSB
J5 21
43
65
VCCVCC
5
I/O VL1
6
THREE-STATE
7
VCC
8
I/O VCC1
VCC
VCC VUSB
SCL
SDA
SDA
SCL
L2
4.7μHJ6
VCC
J7
GND
VCC
MAX3674 Evaluation Kit
_______________________________________________________________________________________ 5
Figure 2. MAX3674 EV Kit Schematic
Evaluates: MAX3674
MAX3674 Evaluation Kit
6 _______________________________________________________________________________________
Figure 3. MAX3674 EV Kit Component Placement Guide—Component Side
Evaluates: MAX3674
Figure 4. MAX3674 EV Kit PCB Layout—Component Side
MAX3674 Evaluation Kit
_______________________________________________________________________________________ 7
Evaluates: MAX3674
MAX3674 Evaluation Kit
8 _______________________________________________________________________________________
Figure 5. MAX3674 EV Kit PCB Layout—Ground Plane
Evaluates: MAX3674
Figure 6. MAX3674 EV Kit PCB Layout—Power Plane
MAX3674 Evaluation Kit
_______________________________________________________________________________________ 9
Evaluates: MAX3674
MAX3674 Evaluation Kit
Figure 7. MAX3674 EV Kit PCB Layout—Solder Side
10 _____________________________________________________________________________________
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