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DS25BR400 Datasheet(PDF) 5 Page - Texas Instruments |
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DS25BR400 Datasheet(HTML) 5 Page - Texas Instruments |
5 / 17 page DS25BR400 www.ti.com SNLS230I – MAY 2006 – REVISED FEBRUARY 2013 To compensate for the high frequency losses incurred during signal transmission in cables and backplanes the DS25BR400 employs input and output signal conditioning. Each input stage has a fixed equalizer and all output drivers have four selectable steps of de-emphasis to reduce deterministic jitter on the serial link. All the CML output drivers have 50 Ω termination to VCC. All receiver inputs are internally terminated with differential 100Ω impedance. Table 2. Logic Table for Loopback Controls LB0 Loopback Function 0 Enable loopback from IB_0± to OA_0±. 1 (default) Normal mode. Loopback disabled. LB1 Loopback Function 0 Enable loopback from IB_1± to OA_1±. 1 (default) Normal mode. Loopback disabled. LB2 Loopback Function 0 Enable loopback from IB_2± to OA_2±. 1 (default) Normal mode. Loopback disabled. LB3 Loopback Function 0 Enable loopback from IB_3± to OA_3±. 1 (default) Normal mode. Loopback disabled. Table 3. De-Emphasis Controls De-Emphasis Level in mVPP PreA_[1:0] Default VOD Level in mVPP (VODB) De-Emphasis in dB (VODPE/VODB) (VODPE) 0 0 1200 1200 0 0 1 1200 850 −3 1 0 1200 600 −6 1 1 (Default) 1200 426 −9 De-Emphasis Level in mVPP PreB_[1:0] Default VOD Level in mVPP (VODB) De-Emphasis in dB (VODPE/VODB) (VODPE) 0 0 1200 1200 0 0 1 1200 850 −3 1 0 1200 600 −6 1 1 (Default) 1200 426 −9 Output De-Emphasis De-emphasis is the conditioning function for use in compensating against backplane transmission loss. The DS25BR400 provides four steps of de-emphasis ranging from 0, −3, −6 and −9 dB, user-selectable dependent on the loss profile of the backplane. Figure 2 shows a driver de-emphasis waveform. The de-emphasis duration is nominal 200 ps, corresponding to 50% bit-width at 2.5 Gbps. The de-emphasis levels of switch-side and line- side can be individually programmed. Copyright © 2006–2013, Texas Instruments Incorporated Submit Documentation Feedback 5 Product Folder Links: DS25BR400 |
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