DS64BR401 Datasheet, PDF (13/30 Pages) National Semiconductor (TI) – Quad Bi-Directional Transceiver with Equalization and De-Emphasis

RATE
DEM1 DEM0
De-
Emphasi
s Level
(typ)
DE Pulse
Width
(typ)
VOD (typ)
Recommended Media Length
0/F F
1 -12 dB 250 ps VOD: (1000 to 1200) + 200 mVp-p 10 meters (24 AWG)
enhanced
0/F F
F
Reserved, don't use
1/F 0
0
0 dB
0 ps VOD: 600 to 1200 mVp-p
5 inch FR4 trace or 0.5 meter (28 AWG)
1/F 0
1 -3.5 dB 200 ps VOD = 1000 mVp-p
10 inch FR4 trace or 1 meter (28 AWG)
-2 dB 200 ps VOD = 1200 mVp-p
10 inch FR4 trace or 1 meters (28 AWG)
1/F 1
0
-6 dB 200 ps VOD = 1000 mVp-p
20 inch FR4 trace or 2 meters (28 AWG)
-3 dB 200 ps VOD = 1200 mVp-p
15 inch FR4 trace or 1 meters (28 AWG)
1/F 1
1
-9 dB 180 ps VOD = 1000 mVp-p
enhanced
3 meters (28 AWG)
-11 dB 180 ps VOD = 1200 mVp-p
enhanced
4 meters (28 AWG)
1/F 0
F
-6 dB 180 ps VOD = 1000 mVp-p
enhanced
3 meters (26 AWG)
-8 dB 180 ps VOD = 1200 mVp-p
enhanced
4 meters (26 AWG)
1/F 1
F -12 dB 180 ps VOD = 1000 mVp-p
enhanced
5 meters (24 AWG)
-13 dB 180 ps VOD = 1200 mVp-p
enhanced
6 meters (24 AWG)
1/F F
0
-9 dB 160 ps VOD = 1000 + 200 mVp-p
enhanced
5 meters (26 AWG)
-10 dB 160 ps VOD = 1200 + 200 mVp-p
enhanced
6 meters (26 AWG)
1/F F
1 -12 dB 160 ps VOD: (1000 to 1200) + 200 mVp-p 7 meters (24 AWG)
enhanced
1/F F
F
Reserved, don't use
Note: F = Float (don't drive pin), 1 = High and 0 = Low. Enhanced DE pulse width provides de-empahsis on second bit.
When RATE = F (auto rate detection active), the DE level and pulse width settings follow detected rate after exiting IDLE. RATE
= 0 is 3 Gbps and RATE = 1 is 6 Gbps. De-emphasis should only be used with VOD = 1000 mVp-p or 1200 mVp-p. VOD less
then 1000 mVp-p is not recommended with de-emphasis. Please refer to VOD1 and VOD0 pin description to set the output
differential voltage level.
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