DS100BR111A Datasheet, PDF (12/35 Pages) Texas Instruments – Ultra Low Power 10.3 Gbps 2-Channel Repeaters with Input Equalization and Output De-Emphasis

Functional Description
The DS100BR111A 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 2: 4-
Level Control Pin Settings
Table 2: 4-Level Control Pin Settings
Pin Setting
0
R
Float
1
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).
Table 3: Equalizer Settings
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
EQ — 8 bits [7:0] dB Boost at 5 Ghz
0000 0000 = 0x00
2.5
0000 0001 = 0x01
6.5
0000 0010 = 0x02
9
0000 0011 = 0x03
11.5
0000 0111 = 0x07
14
0001 0101 = 0x15
15
0000 1011 = 0x0B
17
0000 1111 = 0x0F
19
0101 0101 = 0x55
20
0001 1111 = 0x1F
23
11
Float
Float 0010 1111 = 0x2F
25
12
Float
1
0011 1111 = 0x3F
27
13
1
0
1010 1010 = 0xAA
30
14
1
R
0111 1111 = 0x7F
31
15
1
Float 1011 1111 = 0xBF
33
16
1
1
1111 1111 = 0xFF
34
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.
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