19-5166; Rev 0; 2/10
MAX4986 Evaluation Kit
General Description
The MAX4986 evaluation kit (EV kit) provides a proven
design to evaluate the MAX4986 SAS/SATA 2:1/1:2 mul-
tiplexer/demultiplexer. The EV kit contains four sections:
an application circuit, characterization circuit, and two
sets of calibration traces.
The application circuit is designed to demonstrate the
MAX4986 in multiplexing and equalizing SAS/SATA sig-
nals. This section of the EV kit operates from an external
+5V supply that is regulated by an on-board LDO to
+3.3V, which powers the MAX4986 (U1). All traces in
the application circuit are 100I differential controlled-
impedance traces.
The characterization circuit is provided for eye diagram
evaluation using SMA connectors and 50I controlled-
impedance traces. This section is powered by an exter-
nal +3.3V power supply.
For information on the specifications for SATA interfaces,
refer to documents defined by the 2.6 release from the
Serial ATA industry work group (www.serialata.org), or
if superceded, by the most recently released document
from the ATA ANSI work group (www.t13.org).
S
One SATA Host Connector
S
Two SATA Device Connectors
S
Application Circuit with SATA Inputs/Outputs
S
Eye Diagram Test Circuit with SMA Inputs/
Features
Evaluates: MAX4986
Outputs
S
Calibration Traces (50I Load Trace and Through
Trace)
S
Proven PCB Layout
S
Fully Assembled and Tested
Ordering Information
PART
TYPE
MAX4986EVKIT+
EV Kit
+Denotes
lead(Pb)-free and RoHS compliant.
Component List
DESIGNATION
C1, C3, C4, C9,
C10, C19, C22,
C27, C28, C37
C2, C25
C5–C8, C11–C18,
C23, C24, C35,
C36, C38–C41
C20, C21, C42
QTY
10
DESCRIPTION
0.1FF
Q10%,
16V X7R
ceramic capacitors (0603)
Murata GRM188R71C104K
10FF
Q20%,
6.3V X5R
ceramic capacitors (0603)
Murata GRM188R60J106M
0.01FF
Q5%,
25V X7R
ceramic capacitors (0402)
Murata GRM155R71E103J
1FF
Q10%,
16V X5R
ceramic capacitors (0603)
Murata GRM188R61C105K
0.1FF
Q10%,
16V X7R
ceramic capacitor (0402)
Murata GRM155R71C104K
Red LED (0603)
Disk drive power connector
7-position SATA vertical
connectors
2-pin header
3-pin header
—
—
*EP
= Exposed pad.
2
1
DESIGNATION
P1, P2, P11–P18
R1
R2–R8, R10–R15,
R17–R22
R9
R34, R35
SW1, SW2, SW3
TP1
TP2, TP3
U1, U2
QTY
10
1
19
1
2
3
1
2
2
DESCRIPTION
Edge-mount receptacle SMA
connectors
300I
Q5%
resistor (0603)
10kI
Q5%
resistors (0603)
0I
Q5%
resistor (0603)
49.9I
Q1%
resistors (0402)
8-channel SPST DIP switches
Red multipurpose test point
Black multipurpose test points
SAS/SATA multiplexers
(42 TQFN-EP*)
Maxim MAX4986CTO+
500mA linear regulator
(8 TDFN-EP*)
Maxim MAX8902AATA+
Shunts
PCB: MAX4986 EVALUATION
KIT+
2
20
3
C26
D1
H1
J1, J2, J3
JU1
JU2
1
1
1
3
1
1
U3
1
_______________________________________________________________
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.
MAX4986 Evaluation Kit
Evaluates: MAX4986
Component Supplier
SUPPLIER
PHONE
WEBSITE
Murata Electronics North America, Inc.
770-436-1300
www.murata-northamerica.com
Note:
Indicate that you are using the MAX4986 when contacting this component supplier.
Quick Start
• MAX4986 EV kit
• +5V, 200mA power supply
• Two SATA cables
• Two SATA devices (e.g., hard drives)
• SATA host (e.g., PC)
The MAX4986 EV kit is fully assembled and tested.
Follow the steps below to verify board operation:
1)
2)
3)
4)
8)
Required Equipment
The host should recognize DEVICE A as a hard
drive. DEVICE A can be written to during this time.
The hard drives must be preformatted. Refer to the
operating system instructions for mounting and
installing the hard drives.
Change SEL to the high position on position 1 of
SW1. The host should recognize DEVICE B as a
hard drive. DEVICE B can be written to during this
time.
9)
Procedure
Detailed Description of Hardware
The MAX4986 evaluation kit (EV kit) evaluates the
MAX4986 SAS/SATA 2:1/1:2
multiplexer/demultiplexer.
The MAX4986 is designed to multiplex and equalize
SAS and SATA signals. The EV kit is divided into four
sections: application circuit, characterization circuit, and
two sets of calibration traces.
The application circuit utilizes 100I differential con-
trolled-impedance traces and provides three SATA
connectors (J1, J2, J3), allowing for evaluation of the
MAX4986 in a SAS/SATA environment. J1 and J2 are
wired as devices for demonstration of the failsafe con-
figuration. J3 is wired as the host. The MAX4986 can
also operate with two hosts and one device, but the EV
kit is wired for only the failsafe configuration. To oper-
ate the EV kit with two hosts and one device, the three
SATA connectors (J1, J2, J3) need to be installed on the
backside of the EV kit. Then J1 and J2 become the host
connectors and J3 becomes the device.
Verify that jumpers JU1 and JU2 are in their default
positions, as shown in Table 1.
Verify that switch settings for SW1 and SW2 are in
the low position.
Connect a SATA source to J3 (HOST) on the
MAX4986 EV kit.
Connect a SATA cable A from J1 (DEVICE A) to the
first SATA hard drive A. Connect a second SATA
cable B from J2 (DEVICE B) to the second SATA
hard drive B.
Apply +5V between VIN and GND.
Power the hard drives.
Enable the MAX4986 by driving EN high on position
8 of SW2.
5)
6)
7)
Table 1. Jumper Descriptions (JU1, JU2)
JUMPER
JU1
SHUNT POSITION
1-2*
Open
JU2
*Default
position.
1-2*
2-3
DESCRIPTION
Connects the +3.3V regulated supply to the MAX4986. Verify the supply by mea-
suring the voltage between TP1 and TP2.
Apply an external +3.3V regulated supply between TP1 and TP2.
VL is powered by on-board VCC.
VL is powered externally by applying a voltage to EXTVL.
2
______________________________________________________________________________________
MAX4986 Evaluation Kit
Evaluates: MAX4986
The characterization circuit utilizes 50I controlled-
impedance traces and SMA connectors, allowing for eye
diagrams, return loss, and other compliance measure-
ments. A separate +3.3V power supply needs to con-
nect between the VCC and GND pads. It is possible to
connect the +3.3V generated from the application circuit
and apply it to the VCC pad. The GNDs are separated
between the application circuit and characterization cir-
cuit, so both power and GND need to be applied.
The lower half of the EV kit provides two sets of calibration
traces, all of which are matched to the trace lengths in the
characterization circuit. These traces provide a reference
for determining the performance of only the MAX4986
device when evaluated in the characterization circuit.
The application circuit must be powered by +3.3V. There
are two ways to get this voltage, through the on-board
LDO (U3) or by directly connecting to a +3.3V power
supply. When using the on-board voltage regulator, the
LDO can be powered by the 4-pin Molex connector (H1)
or by a +5V external supply connected to the VIN and
GND pads. When using the on-board LDO to supply
power, there is a power LED (D1) to indicate the pres-
ence of power at the VIN supply.
The user can also connect directly to a +3.3V supply,
which is available on a SATA power connector. The
shunt must be removed from jumper JU1. Apply the
+3.3V supply between TP1 and TP2.
The application circuit section allows an easy way to
interface a host (PC) to SAS/SATA devices (e.g., hard
drives) for a functional test of the MAX4986. Different
lengths and types of cables can be used to test enable,
drive selection, preemphasis, equalization, and OOB
threshold settings. Change the positions on the DIP
switches (SW1, SW2) to control the settings of the
MAX4986 in the application section. Tables 2 and 3
show the various setting options.
Cable Detection
To test the cable-detection feature, remove resistor R9.
Without R9 populated,
EN
is shorted to GND when a
device is plugged into J1 or J2. EN must be high to test
this feature. The cable detection applies only to J1 or J2.
The characterization circuit is provided as a separate
test circuit for eye diagram evaluation of the MAX4986.
The characterization circuit section allows for detailed
frequency analysis of a single channel. All channels have
similar performance by design. This circuit provides
differential SMA inputs and outputs with 50I controlled-
impedance traces.
DIP switch SW3 has fewer options because it only deals
with one channel and some settings do not apply or are
set in hardware. To control the settings of the MAX4986
in the characterization circuit section, see Table 4.
Input Supply (VCC)
The characterization circuit is powered by an external
+3.3V power supply connected between the VCC and
GND pads. The GND in the application circuit is not
continuous with the GND in the characterization circuit
section.
External Logic Supply (EXTVL)
The VL logic supply can interface to a lower voltage than
VCC, as low as +1.8V. Connecting to an external logic
supply also separates the leakage current from the VCC
current.
The lower half of the EV kit provides two sets of calibra-
tion traces that can be used for further analysis. The
lengths of the calibration traces are matched to the
traces going from the SMA connector to the MAX4986
(U2) of the characterization circuit. The first calibration
trace includes a 50I load termination and the second
calibration trace is a straight through trace.
Characterization Circuit
Input Supply (VIN)
Application Circuit
Calibration Traces
_______________________________________________________________________________________
3
MAX4986 Evaluation Kit
Evaluates: MAX4986
Table 2. SW1 Switch Settings
POSITION
1
2
3
4
5
6
7
8
*Default
position.
NAME
SEL
OAMPB
OAMPA
MODE
INEQ
PEB
PEA
—
SETTINGS
Low*
High
Low*
High
Low*
High
Low*
High
Low*
High
Low*
High
Low*
High
—
DESCRIPTION
Connects the HOST (J3) to DEVICE A (J1)
Connects the HOST (J3) to DEVICE B (J2)
Drives DEVICE B (J2) with high amplitude
Drives DEVICE B (J2) with low amplitude
Drives DEVICE A (J1) with high amplitude
Drives DEVICE A (J1) with low amplitude
Sets SAS OOB threshold for HOST (J3)
Sets SATA OOB threshold for HOST (J3)
Sets no input equalization for HOST (J3)
Sets input equalization for HOST (J3)
Sets no preemphasis for DEVICE B (J2)
Sets preemphasis for DEVICE B (J2)
Sets no preemphasis for DEVICE A (J1)
Sets preemphasis for DEVICE A (J1)
—
Table 3. SW2 Switch Settings
POSITION
1
2
3
4
5
6
7
8
*Default
position.
NAME
EQA
EQB
OUTPE
OAMP
MODEB
MODEA
—
EN (pin 10)
SETTINGS
Low*
High
Low*
High
Low*
High
Low*
High
Low*
High
Low*
High
—
Low*
High
DESCRIPTION
Sets no input equalization for DEVICE A (J1)
Sets input equalization for DEVICE A (J1)
Sets no input equalization for DEVICE B (J2)
Sets input equalization for DEVICE B (J2)
Sets no preemphasis for HOST (J3)
Sets preemphasis for HOST (J3)
Drives HOST (J3) with high amplitude
Drives HOST (J3) with low amplitude
Sets SAS OOB threshold for DEVICE B (J2)
Sets SATA OOB threshold for DEVICE B (J2)
Sets SAS OOB threshold for DEVICE A (J1)
Sets SATA OOB threshold for DEVICE A (J1)
—
MAX4986 (U1) is in shutdown
MAX4986 (U1) is enabled
4
______________________________________________________________________________________
MAX4986 Evaluation Kit
Evaluates: MAX4986
Table 4. SW3 Switch Settings
POSITION
1
2
3
4
5
6
7
8
*Default
position.
NAME
OAMPA2
EN2
MODE2
INEQ2
PEA2
—
—
—
SETTINGS
Low*
High
Low*
High
Low*
High
Low*
High
Low*
High
—
—
—
DESCRIPTION
Drives outputs (P11, P12) with high amplitude
Drives outputs (P11, P12) with low amplitude
MAX4986 (U2) is in shutdown
MAX4986 (U2) is enabled
Sets SAS OOB threshold
Sets SATA OOB threshold
Sets P1, P2 inputs with no equalization
Sets P1, P2 inputs with equalization
Sets P11, P12 outputs with no preemphasis
Sets P11, P12 outputs with preemphasis
—
—
—
_______________________________________________________________________________________
5
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