19-4291; Rev 0; 10/08
MAX4951 Evaluation Kit
General Description
The MAX4951 evaluation kit (EV kit) provides a proven
design to evaluate the MAX4951 dual-channel buffer.
The EV kit contains four sections: an application circuit,
a characterization circuit, and two calibration traces.
The application circuit is designed to demonstrate the
use of the MAX4951 in redriving serial-ATA (SATA) and
eSATA Gen I and Gen II signals. This section of the EV
kit operates from an external +5V supply that is regulat-
ed by an on-board LDO to +3.3V, which powers the
MAX4951 (U1) device. All traces in the application cir-
cuit are 100Ω differential controlled impedance.
The characterization circuit is provided for eye diagram
evaluation using SMA connectors and 50Ω controlled
impedance traces. This section is powered by an exter-
nal +3.3V supply.
o
Eye Diagram Test Circuit with SMA
Inputs/Outputs
o
Calibration Traces (50Ω Load Trace and Through
Trace)
o
Lead-Free and RoHS Compliant
o
Proven PCB Layout
o
Fully Assembled and Tested
Features
o
Application Circuit with SATA Input/Output
Evaluates: MAX4951
Ordering Information
PART
MAX4951EVKIT+
TYPE
EV Kit
+Denotes
lead-free and RoHS compliant.
Component List
DESIGNATION
C1–C8,
C14–C17,
C22–C25
QTY
DESCRIPTION
0.01µF ±10%, 25V X7R ceramic
capacitors (0402)
Murata GRM155R71E103KA
TDK C1005X7R1E103K
1µF ±10%, 16V X7R ceramic
capacitors (0603)
Murata GRM188R71C105K
TDK C1608X7R1C105K
0.1µF ±10%, 16V X7R ceramic
capacitors (0402)
Murata GRM155R71C104K
TDK C1005X7R1C104K
Green LED (0603)
Disk drive power connector
7-position SATA vertical connectors
3-pin headers, 0.1in centers
—
—
6
1
DESIGNATION
JU4
JU6
P1–P10
R1
R2, R3
U1, U2
QTY
1
0
10
1
2
2
DESCRIPTION
2-pin header, 0.1in centers
Not installed, 3-pin header
Edge-mount receptacle SMA
connectors
Johnson 142-0701-851
200Ω ±5% resistor (0603)
49.9Ω ±1% resistors (0603)
SATA I/II bidirectional redrivers
(20 TQFN-EP*)
MAX4951CTP+
+3.3V regulator (6 SOT23)
MAX6329TPUT-T+
(Top Mark: AAIP)
Shunts
PCB: MAX4951 Evaluation Kit+
16
C9, C18, C26,
C27
4
C10–C13, C19,
C20, C21
D1
H1
J1, J2
JU1, JU2, JU3,
JU5, JU7
7
U3
1
1
1
2
5
*EP
= Exposed pad.
Component Suppliers
SUPPLIER
Murata Electronics North America, Inc.
TDK Corp.
PHONE
770-436-1300
847-803-6100
WEBSITE
www.murata-northamerica.com
www.component.tdk.com
Note:
Indicate that you are using the MAX4951 when contacting these component suppliers.
________________________________________________________________
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.
MAX4951 Evaluation Kit
Evaluates: MAX4951
Quick Start (Application Circuit)
Recommended Equipment
Before beginning, the following equipment is needed:
• MAX4951 EV kit
• +5V power supply
•
•
•
Two SATA-to-SATA or eSATA-to-SATA cables
SATA device (e.g., a hard drive)
SATA host (e.g., a PC)
Application Circuit (U1)
The application circuit (U1) provides the means for eval-
uating the MAX4951 in a SATA application. This section
of the EV kit provides two SATA connectors (J1 and J2),
one for connection to a SATA host (e.g., PC) and the
other for connection to a SATA device (e.g., hard drive).
Procedure
The MAX4951 EV kit is fully assembled and tested.
Follow the steps below to verify board operation:
1) Verify that all jumpers are in their default position,
as shown in Table 1.
2) Connect the first SATA-to-SATA/eSATA-to-SATA
cable from the PC to the host (J1) connector on the
EV kit.
3) Connect the second SATA-to-SATA/eSATA-to-
SATA cable from the device (J2) connector to the
SATA device.
4) Verify communication between the host PC and
SATA device.
Input Supply (VIN)
The application circuit must be powered by +3.3V.
There are two ways to get this voltage, through the on-
board LDO (U3) or connecting directly to a +3.3V sup-
ply. 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 sup-
ply power, there is a power LED (D1) to indicate the
presence of +3.3V at VCC.
The user can also connect directly to a +3.3V supply,
which is available on a SATA power connector. The
shunt should be removed from jumper JU4 and a wire
connected from the SATA power pin to pin 2 (right-
most pin) of jumper JU4 (see Table 2).
Table 2. Jumper JU4 Function
SHUNT
POSITION
Installed*
VCC PIN (U1)
Connected to
on-board LDO
output
Connected to
external supply
DESCRIPTION
U1 powered by LDO output,
+3.3V
Powered by +3.3V from an
external supply or SATA
power connector
Table 1. Default Shunt Positions
JUMPER
JU1, JU4, JU5
JU2, JU3, JU7
SHUNT POSITION
1-2
2-3
Not
installed
Detailed Description of Hardware
The MAX4951 evaluation kit (EV kit) evaluates the
MAX4951 dual-channel buffer. The MAX4951 is designed
to redrive serial-ATA (SATA) and eSATA Gen I and Gen II
signals. The EV kit is divided into four sections: application
circuit, characterization circuit, and two calibration traces.
The application circuit utilizes 100Ω differential con-
trolled impedance traces and provides two SATA con-
nectors (J1 and J2), allowing for evaluation of the
MAX4951 in a SATA environment. The characterization
circuit utilizes 50Ω controlled impedance traces and
SMA input/output connectors, allowing for eye dia-
grams and input/output return loss measurements.
The lower half of the EV kit provides two sets of calibra-
tion traces, all of which are matched to the trace
lengths in the characterization circuit. These traces
provide a reference for determining the performance of
the MAX4951 device only, when evaluated in the char-
acterization circuit.
2
*Default
position.
Device Enable (JU1)
The MAX4951 (U1) is enabled/disabled by configuring
jumper JU1 (see Table 3). When disabled, the
MAX4951 buffers are disabled and the part is placed in
a low-power standby mode.
Table 3. Jumper JU1 Function
SHUNT
POSITION
1-2*
2-3
EN PIN
(U1)
Connected to
+3.3V
Connected to
GND
DESCRIPTION
Buffers enabled for normal
operation
Buffers disabled and device
is in low-power standby mode
*Default
position.
_______________________________________________________________________________________
MAX4951 Evaluation Kit
Output Boost Control (JU2, JU3)
The MAX4951 host and device can be evaluated with
standard SATA output levels or with boosted output
levels. Configure JU2 to enable/disable the host output
boost and JU3 to enable/disable the device output
boost (see Tables 4 and 5, respectively).
Device Enable (JU5)
The MAX4951 (U2) is enabled/disabled by configuring
jumper JU5 (see Table 6). When disabled, the
MAX4951 buffers are disabled and the part is placed in
a low-power standby mode.
Evaluates: MAX4951
Table 4. Jumper JU2 Function
SHUNT
POSITION
1-2
2-3*
Not
installed
BB PIN (U1)
Connected to
+3.3V
Connected to
GND
Not connected
DESCRIPTION
Host output boost enabled
Table 6. Jumper JU5 Function
SHUNT
POSITION
1-2*
2-3
EN PIN (U2)
Connected to
+3.3V
Connected to
GND
DESCRIPTION
Buffers enabled for normal
operation
Buffers disabled and device
is in low-power standby mode
Host output boost disabled;
standard SATA output levels
*Default
position.
*Default
position.
Table 5. Jumper JU3 Function
SHUNT
POSITION
1-2
2-3*
Not
Installed
BA PIN (U1)
Connected to
+3.3V
Connected to
GND
Not connected
DESCRIPTION
Device output boost enabled
Output Boost Control (JU7)
The MAX4951 channel A can be evaluated with stan-
dard SATA output levels or with boosted output levels.
Configure JU7 to enable/disable channel A’s output
boost (see Table 7).
Table 7. Jumper JU7 Function
SHUNT
POSITION
1-2
2-3*
Not
installed
BA PIN (U2)
Connected to
+3.3V
Connected to
GND
Not connected
DESCRIPTION
Channel A output boost
enabled
Channel A output boost
disabled; standard SATA
output levels
Device output boost disabled;
standard SATA output levels
*Default
position.
Characterization Circuit (U2)
The characterization circuit (U2) is provided as a sepa-
rate test circuit for eye diagram evaluation of the
MAX4951 IC. This circuit provides differential SMA
inputs and outputs with 50Ω controlled impedance
traces. Channel B is not utilized in this section of the EV
kit, but provides the same performance as channel A.
*Default
position.
Calibration Traces
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 MAX4951 (U2)
of the characterization circuit. The first calibration trace
includes a 50Ω load termination and the second cali-
bration trace is a through trace.
Input Supply (VCC)
The characterization circuit is powered by an external
+3.3V power supply connected between the VCC and
GND pads.
_______________________________________________________________________________________
3
MAX4951 Evaluation Kit
Evaluates: MAX4951
Figure 1a. MAX4951 EV Kit Schematic (Sheet 1 of 3)
4
_______________________________________________________________________________________
MAX4951 Evaluation Kit
Evaluates: MAX4951
Figure 1b. MAX4951 EV Kit Schematic (Sheet 2 of 3)
_______________________________________________________________________________________
5
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