Datasheet

MAX4951AE Evaluation Kit
Evaluates: MAX4951AE
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Table 2. Jumper JU4 Function
Table 4. Jumper JU2 Function
Table 5. Jumper JU3 Function
Table 3. Jumper JU1 Function
*Default position.
*Default position.
*Default position.
*Default position.
Input Supply (VIN)
The MAX4951AE must be powered by +3.3V. There are
two ways to get this voltage, through the on-board LDO
(U3) or by connecting directly 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 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 the
+3.3V supply or SATA power can be connected to the
+3.3V pad (see Table 2).
Device Enable (JU1)
The MAX4951AE (U1) is enabled/disabled by config-
uring jumper JU1 (see Table 3). When disabled, the
MAX4951AE buffers are powered down and the part
is placed in a low-power mode. When enabled, and no
SATA device is plugged in (CAD is unconnected), the
device enters a low-power mode. Once a SATA device
is plugged in (CAD grounded), the device goes into
active mode.
Output Boost Control (JU2, JU3)
The MAX4951AE host and device can be evaluated with
standard SATA output levels or with boosted output lev-
els. Configure jumper JU2 to enable/disable the host out-
put boost and jumper JU3 to enable/disable the device
output boost (see Tables 4 and 5).
SHUNT
POSITION
VCC PIN (U1) DESCRIPTION
Installed*
Connected to on-
board LDO output
U1 powered by LDO
output, +3.3V
Not
installed
Connected to
external supply
Powered by +3.3V from
an external supply or
SATA power connector
SHUNT
POSITION
BB PIN (U1) DESCRIPTION
1-2
Connected to
+3.3V
Host output boost
enabled
2-3*
Connected to
GND
Host output boost dis-
abled (standard SATA
output levels)
Not
installed
Not connected
SHUNT
POSITION
BA PIN (U1) DESCRIPTION
1-2
Connected to
+3.3V
Device output boost
enabled
2-3*
Connected to
GND
Device output boost dis-
abled (standard SATA
output levels)
Not
installed
Not connected
SHUNT
POSITION
EN PIN (U1) DESCRIPTION
1-2*
Connected to
+3.3V
Buffers enabled for
normal operation
2-3
Connected to
GND
Buffers disabled and
device is in low-power
mode