Datasheet

Maxim Integrated │ 4
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Evaluates: MAX14986
MAX14986 Evaluation Kit
Characterization Circuit (U2)
The characterization circuit is provided as a separate test
circuit for eye diagram evaluation of the IC. This circuit
provides differential SMA inputs and outputs with 50Ω
single-ended, controlled-impedance traces. Channel 1 is
not utilized in this section of the EV kit, but provides the
same performance as Channel 0.
Power Supply (VCC)
The characterization circuit is powered by an external
+3.3V power supply connected between the VCC and
GND pads.
Mode Control (JU10)
The U2 device can also be used to redrive Serial ATA
(SATA) signals. The MODE pin configures the device to
operate with SATA or SAS signals (see Table 9 for jumper
JU10 functions).
Device Enable (JU9)
The U2 device is enabled/disabled by configuring jumper
JU9 (see Table 10). When disabled, the device buffers are
disabled and the part is placed in a low-power standby
mode.
Input Equalization (JU7)
The IC’s channel 0 can be evaluated with or without input
equalization. Configure JU7 to enable/disable channel 0
equalization.
Output Preemphasis (JU8)
The IC’s channel 0 can be evaluated with or without
preemphasis. Configure JU8 to enable/disable channel 0
preemphasis.
Calibration Traces
The bottom-half of the EV kit provides two sets of
calibration traces, which can be used for further analysis.
The lengths of the calibration traces are matched to the
traces going from the SMA connector to the U2 device
of the characterization circuit. The first calibration trace
includes a 50Ω single-ended load termination and the
second calibration trace is a through trace.
Table 10. Jumper JU9 Function
Table 9. Jumper JU10 Function
Table 11. Jumper JU7 Function
Table 12. Jumper JU8 Function
*Default position.
*Default position.
*Default position.
*Default position.
SHUNT POSITION EN PIN (U2) DESCRIPTION
1-2* Connected to VCC (+3.3V) Buffers enabled for normal operation
2-3 Connected to GND
Buffers disabled and device is in low-power standby
mode
Not installed Not connected
SHUNT POSITION MODE PIN (U2) DESCRIPTION
1-2 Connected to VCC (+3.3V) Signal type: SATA
2-3* Connected to GND
Signal type: SAS
Not installed Not connected
SHUNT POSITION EQ0 PIN (U2) DESCRIPTION
1-2 Connected to VCC (+3.3V) Channel 0 equalization enabled
2-3* Connected to GND
Channel 0 equalization disabled
Not installed Not connected
SHUNT POSITION PE0 PIN (U2) DESCRIPTION
1-2 Connected to VCC (+3.3V) Channel 0 preemphasis enabled
2-3* Connected to GND
Channel 0 preemphasis disabled
Not installed Not connected