DS64BR401_13 Datasheet, PDF (14/36 Pages) Texas Instruments – Quad Bi-Directional Transceiver with Equalization and De-Emphasis

DS64BR401
SNLS304G – JUNE 2009 – REVISED APRIL 2013
www.ti.com
Table 5. De-Emphasis Input Select Pins for A and B ports (3–Level Input) (continued)
RATE
1/F
1/F
1/F
1/F
1/F
1/F
1/F
1/F
DEM1
(1)
0
1
1
0
1
F
F
F
DEM0
(1)
1
0
1
F
F
0
1
F
De-
Emphasis
Level
(typ)
-3.5 dB
-2 dB
-6 dB
-3 dB
-9 dB
-11 dB
-6 dB
-8 dB
-12 dB
-13 dB
-9 dB
-10 dB
-12 dB
DE Pulse
Width
(typ)
200 ps
200 ps
200 ps
200 ps
180 ps
enhanced
180 ps
enhanced
180 ps
enhanced
180 ps
enhanced
180 ps
enhanced
180 ps
enhanced
160 ps
enhanced
160 ps
enhanced
160 ps
enhanced
VOD (typical)
Suggested Use
VOD = 1000 mVp-p
VOD = 1200 mVp-p
VOD = 1000 mVp-p
VOD = 1200 mVp-p
VOD = 1000 mVp-p
10 inch FR4 trace or 1 meter (28 AWG)
10 inch FR4 trace or 1 meters (28 AWG)
20 inch FR4 trace or 2 meters (28 AWG)
15 inch FR4 trace or 1 meters (28 AWG)
3 meters (28 AWG)
VOD = 1200 mVp-p
4 meters (28 AWG)
VOD = 1000 mVp-p
3 meters (26 AWG)
VOD = 1200 mVp-p
4 meters (26 AWG)
VOD = 1000 mVp-p
5 meters (24 AWG)
VOD = 1200 mVp-p
6 meters (24 AWG)
VOD = 1000 + 200 mVp-p
5 meters (26 AWG)
VOD = 1200 + 200 mVp-p
6 meters (26 AWG)
VOD: (1000 to 1200) + 200 mVp-p 7 meters (24 AWG)
Reserved, don't use
TXIDLEA/B
0
Float
1
Table 6. Idle Control (3–Level Input)
Function
This state is for lossy media, dedicated Idle threshold detect circuit disabled,
output follows input based on EQ settings. Idle state not verified.
Float enables automatic idle detection. Idle on the input is passed to the
output. Internal 50KΩ resistors hold TXIDLEA/B pin at a mid level - don't
connect this pin if the automatic idle detect function is desired. This is the
default state. Output in Idle if differential input signal less than value set by
SD_TH pin.
Manual override, output in electrical Idle. Differential inputs are ignored.
Table 7. Receiver Electrical Idle Detect Threshold Adjust
SD_TH resistor value (Ω)⁽¹⁾
Receiver Electrical Idle Detect Threshold (DIFF p-p)
Float (no resistor required)
130 mV (default condition)
0
225 mV
80k
20 mV
(1) SD_TH resistor value can be set from 0 through 80k ohms to achieve desired idle detect threshold, see Figure 6
14
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