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SN75LVPE801 Datasheet(PDF) 12 Page - Texas Instruments |
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SN75LVPE801 Datasheet(HTML) 12 Page - Texas Instruments |
12 / 34 page 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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