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SN75LVPE801 Datasheet(PDF) 12 Page - Texas Instruments

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Part # SN75LVPE801
Description  8.0 Gbps SATA Express Equalizer and Redriver
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

SN75LVPE801 Datasheet(HTML) 12 Page - Texas Instruments

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VCMRX
AutoLPENTRY
AutoLPEXIT
RX1, 2P
RX1, 2N
TX1,2P
TX1,2N
PowerSaving
Mode
VCMTX
tOOB1
12
SN75LVPE801
SLLSEW8 – SEPTEMBER 2016
www.ti.com
Product Folder Links: SN75LVPE801
Submit Documentation Feedback
Copyright © 2016, Texas Instruments Incorporated
Figure 9. Auto Low Power Mode Entry and Exit Timing
9.3.7 Transmitter Output Signal
The SN75LVPE801 differential output signal is 650 mVpp when de-emphasis is disabled (DE input is open or
pulled low).
9.3.8 Transmitter Common Mode
The SN75LVPE801 transmitter common mode output is set to 1.7 V.
9.3.9 De-Emphasis
The SN75LVPE801 transmitter incorporates programmable de-emphasis to provide signal conditioning to offset
the anticipated channel losses based on expected use cases for the device. Figure 10 shows an example of a
SATA host communicating with a SATA device through a backplane. In such a use case, an SN75LVPE801
would be located at the end of the interconnect channels (i.e. at the device end for the host TX channel, and at
the host end for the host RX channel. These locations are selected based on the signal conditioning that is
incorporated into the SN75LVPE801. The SN75LVPE801 provides up to 16 dB of equalization, while supporting
up to 1.2 dB of de-emphasis. The optimum location would therefore be at the end of the interconnect, allowing
the receiver equalization to address the majority of the channel loss, while the de-emphasis would be employed
to overcome the much shorter interconnect length.
The DE input controls the amount of de-emphasis that is applied at the transmitter output. The de-emphasis
selections are shown in Table 1. When DE is left open, or pulled low, de-emphasis shall be off. When DE is
pulled HIGH, 1.2 dB of de-emphasis is used at the transmitter output.
Figure 10. Trace Length Example


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