Datasheet

Maxim Integrated │ 3
www.maximintegrated.com
Evaluates: MAX14970
MAX14970 Evaluation Kit
Output Preemphasis (JU2, JU3)
The host and device can be evaluated with or without
output preemphasis. Configure JU2 to enable/disable the
host output (HAP, HAM) preemphasis and JU3 to enable/
disable the device output (DBM, DBP) preemphasis (see
Tables 4 and 5).
Out-of-Band (OOB) Mode Selection (JU8)
The application circuit provides full OOB signal support
through high-speed OOB-detection circuitry. The SATA
range used can be selected through configuration of jump-
er JU8 (see Table 6). When the MODE pin is set to GND,
the SATA version 3.0 range is used. When the MODE pin
is set to +3.3V, the SATA version 2.6 range is used.
Characterization Circuit (U2)
The characterization circuit is provided as a separate test
circuit for eye diagram evaluation of the device. This cir-
cuit 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 perfor-
mance as channel A.
Input Supply (VCC)
The characterization circuit is powered by an external
+3.3V power supply connected between the VCC and
GND PCB pads.
Device Enable (JU5)
The characterization circuit is enabled/disabled by con-
figuring jumper JU5 (see Table 7). When disabled, the
device buffers are powered down and the part is placed
in a low-power mode.
*Default configuration.
*Default configuration.
*Default configuration.
*Default configuration.
SHUNT
POSITION
PB PIN (U1) DESCRIPTION
1-2
Connected to
+3.3V
Host output preemphasis
enabled
2-3*
Connected to
GND
Host output preemphasis
disabled
Not installed Not connected
SHUNT
POSITION
PA PIN (U1) DESCRIPTION
1-2
Connected to
+3.3V
Device output
preemphasis enabled
2-3*
Connected to
GND
Device output
preemphasis disabled
Not installed Not connected
SHUNT
POSITION
MODE PIN
(U1)
DESCRIPTION
1-2
Connected to
+3.3V
SATA version 2.6 range
is used
2-3*
Connected to
GND
SATA version 3.0 range
is used
SHUNT
POSITION
EN PIN (U2) DESCRIPTION
1-2*
Connected to
+3.3V
Buffers enabled
for normal operation
2-3
Connected to
GND
Buffers disabled and the
device is in low-power
standby mode
Table 4. Jumper JU2 Function (U1 PB)
Table 5. Jumper JU3 Function (U1 PA)
Table 6. Jumper JU8 Function (U1 MODE)
Table 7. Jumper JU5 Function (U2 EN)