CLINK3V48BT-133 National Semiconductor, CLINK3V48BT-133 Datasheet - Page 18

• Manufacturer Part Number: CLINK3V48BT-133
• Description: BOARD EVAL FOR DS90CR485, 486
• Manufacturer: National Semiconductor

Specifications of CLINK3V48BT-133

• Main Purpose: Interface, SerDes (Serializer / De-Serializer)
• Embedded: No
• Utilized Ic / Part: DS90CR485, DS90CR486
• Primary Attributes: Serializes 48 LVCMOS/LVTTL to 8 LVDS, 66 ~ 133 MHz
• Secondary Attributes: Transmits over 2 Meter 3M MDR LVDS Cable
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

2.5V
Transmitter Input Voltage Tolerance Setting
The DS90CR485 transmitter inputs are configurable as either 2.5V or 3.3V
tolerant. This can be achieved by connecting input voltage jumper (J12) to 2.5V
or 3.3V. Typically, the inputs should be set for 3V tolerance.
Transmitter Pre-Emphasis
Transmitter pre-emphasis boosts LVDS drive current during each LVDS logic
transition to reduce cable-loading effects. The jumper (J11) either disables pre-
emphasis or allows the manual adjustment of pre-emphasis level using
potentiometer R42.
Designator
J11
J11
When the jumper J11 is set to MANUAL ADJUST, a 2K-Ohm potentiometer
(R42) can be adjusted using a jeweler’s screwdriver to increase or decrease pre-
emphasis. Turning clockwise increases pre-emphasis; turning counterclockwise
decreases pre-emphasis.
DS90CR485/486 Evaluation Kit User Manual
Rev. 1.01
J12
3.3V
2.5V input tolerance
Manual
Adjust
Manual
Adjust
Settings
0%
0%
18 of 32
2.5V
Note
Pre-emphasis disabled (i.e. 0%)
(Default setting. R42 is ignored.)
R42 adjusts pre-emphasis level
J12
3.3V
3.3V input tolerance