DS64BR111_13 Datasheet, PDF (11/39 Pages) Texas Instruments – DS64BR111 Ultra Low Power 6.4 Gbps 2-Channel Repeaters with Input Equalization and Output De-Emphasis

DS64BR111
www.ti.com
SNLS343C – SEPTEMBER 2011 – REVISED APRIL 2013
FUNCTIONAL DESCRIPTION
The DS64BR111 is a high performance circuit capable of delivering excellent performance. Careful attention
must be paid to the details associated with high-speed design as well as providing a clean power supply. Refer
to the information below and Revision 4 of the LVDS Owner's Manual for more detailed information on high
speed design tips to address signal integrity design issues.
The control pins have been enhanced to have 4 different levels and provide a wider range of control settings.
Refer to Table 1
Pin Setting
0
R
Float
1
Table 1. 4-Level Control Pin Settings
Description
Tie pin to GND through a 1 KΩ resistor
Tie pin to ground through 20 KΩ resistor
Float the pin (no connection)
Tie pin to VDD through a 1 KΩ resistor
Note: 4-Level IO pins require a 1K resistance to GND or VDD/VIN. It is possible to tie mulitple 4-level IO pins
together with a single resistor to GND or VDD/VIN. When multiple IOs are connected in parallel, the resistance to
GND or VDD/VIN should be adjusted to compensate. For 2 pins the optimal resistance is 500 Ohms, 3 pins =
330 Ohms, and 4 pins = 250 Ohms.
Note: For 2.5V mode the control pin logic 1 level is VDD (pins 21 and 22), in 3.3V mode the control pin logic 1
level is defined by VIN (pin 15).
Level
1
2
3
4
5
6
7
8
9
10
EQA1/EQB1
0
0
0
0
R
R
R
R
Float
Float
EQA0/EQB0
0
R
Float
1
0
R
Float
1
0
R
Table 2. Equalizer Settings
EQ — 8 bits [7:0]
0000 0000 = 0x00
0000 0001 = 0x01
0000 0010 = 0x02
0000 0011 = 0x03
0000 0111 = 0x07
0001 0101 = 0x15
0000 1011 = 0x0B
0000 1111 = 0x0F
0101 0101 = 0x55
0001 1111 = 0x1F
dB Boost at 3.2 Ghz
3.7
6.0
7.5
8.5
11
12
14
15
15
18
11
Float
Float
0010 1111 = 0x2F
20
12
Float
1
0011 1111 = 0x3F
22
13
1
0
1010 1010 = 0xAA
23
14
1
R
0111 1111 = 0x7F
25
15
1
Float
1011 1111 = 0xBF
27
16
1
1
1111 1111 = 0xFF
28
Suggested Media
FR4 < 5 inch trace
FR4 5 inch trace
FR4 10 inch trace
FR4 15 inch trace
FR4 20 inch trace
FR4 25 inch trace
FR4 25 inch trace
7m 30AWG Cable
FR4 30 inch trace
8m 30 AWG Cable
FR4 35 inch trace
10m 30 AWG Cable
10m - 12m, Cable
Note: Settings are approximate and will change based on PCB material, trace dimensions, and driver waveform
characteristics.
Level
1
2
3
4
5
VOD_SEL
0
0
0
0
Float
Table 3. De-emphasis and Output Voltage Settings
DEMA/B
0
Float
R
1
0
SMBus Register DEM Level
000
010
011
101
000
SMBus Register VOD Level
000
000
000
000
011
VOD (mV)
700
700
700
700
1000
DEM (dB)
0
- 3.5
-6
-9
0
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