Datasheet
TYPICAL DEVICE IMPLEMENTATION
3.3V
eSATA
Connector
GPIO
1.0uF
0.1uF
SATA Host
10nF
10nF
10nF
10nF
10nF
10nF
10nF
10nF
0.01uF
Note:
1) Place supply caps close to device pin
2) EN can be left open or tied to supply when no external control
is implemented
3) Output pre-emphasis (D1, D0) is shown enabled . Setting will
depend on device placement relative to eSATA connector
EN
VCC
TX_0P
TX_0N
GND
VCC
RX_1P
RX_1N
GND
NC
D0
VCC
RX_0P
RX_0N
GND
VCC
TX_1P
TX_1N
GND
D1
1
10
20
11
SN75LVCP422DB
DETAILED DESCRIPTION
INPUT EQUALIZATION
OUTPUT PRE-EMPHASIS
LOW POWER MODE
SN75LVCP422
www.ti.com
................................................................................................................................................................................................... SLLS972 – MARCH 2009
Each differential input of the SN75LVCP422 has 7 dB of fixed equalization in its front stage. The equalization
amplifies high frequency signals to correct for loss from the transmission channel. The input equalizer is
designed to recover signal even when no eye is present at the receiver and affectively supports FR4 trace at the
input anywhere from < 4 inches to 20 inches or < 10 cm to > 50 cm.
The SN75LVCP422 provides single step pre-emphasis from 0 dB to 2.5 dB at each of its differential outputs.
Pre-emphasis is controlled independently for each channel and is set by the control pins D0 and D1 as shown in
Table 1 . The pre-emphasis duration is 0.5 UI or 133 ps (typ) at SATA 3-Gbps speed.
Two low power modes are supported by the SN75LVCP422:
• Sleep Mode (triggered by EN pin, EN = 0 V)
– Low power mode is controlled by the enable (EN) pin. In its default state this pin is internally pulled high.
Pulling this pin low puts the device in sleep mode within 2 us (max). In this mode all active components of
the device are driven to their quiescent level and differential outputs are driven to Hi-Z (open). Maximum
power dissipation in this mode is 5 mW. Exiting from this mode to normal operation requires a maximum
latency of 20 µ s.
• Auto Low Power Mode (triggered when a given channel is in electrical idle state, EN = V
CC
)
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Product Folder Link(s): SN75LVCP422