Texas Instruments TNETE2201 manual Board Layout and Configuration, Default Setup as Shipped

Application Report

SLLA032

Board Layout and Configuration

The TNETE2201 EVM kit is designed to give the developer many options for operation. Many of these options are selectable by DIP switch and others may require board component removal or additions. The following sections provide guidelines to configure the EVM kit for different modes of operation.

The EVM kit is normally delivered in a default configuration that requires external clock and data inputs. The high-speed serial input and output are routed through the 50-ohm transmission line path. The GBIC interface is not connected and would require some resistor modifications to be functional. The default setup is useful for testing the board and interface IC. The designer might consider testing the bit error rate, jitter, and eye- diagram characteristics of the system. The TNETE2201 EVM is shipped with certain components installed for default operation. Table 1 lists the default configuration.

Table 1. Default Setup as Shipped

Designator	Function	Condition (TNETE2201)
P5	CLK SEL	Jumper installed between Pins 2 and 3
R1	TX Termination	200 ohm installed
R2	TX Termination	200 ohm installed
R5	Bias Net	365 ohm installed
R6	Bias Net	562 ohm installed
R8	WIZ OPTION	Not installed
R9	WIZ OPTION	Not installed
R16	CAP OPTION	Zero ohm installed
R17	Bias Net	Not installed
R21	WIZ OPTION	Not installed
R22	WIZ OPTION	Not installed
C13	Vcc Decouple	0.01 µF installed
C23	GBIC OPTION	Not installed
C24	SMA OPTION	0.01 µF installed
C25	GBIC OPTION	Not installed
C26	SMA OPTION	0.01 µF installed
C27	SMA OPTION	0.01 µF installed
C28	GBIC OPTION	Not installed
C29	GBIC OPTION	Not installed
C30	SMA OPTION	0.01 µF installed
C31	RX Termination	0.01 µF installed
C32	TX PLL Cap	0.0022 µF installed
C33	REF CLK Bias Net	Zero 0hm installed
C34	TX PLL Cap	0.0022 µF installed
L1	Filter/Bias	Ferrite installed
X1	OSC	Not installed (not provided)
DIP1-1	PRBSEN	X (OFF)
DIP1-2	TXRRAMP	X (OFF)
DIP1-3	TXDIR	X (OFF)

TNETE2201 EVM Kit Setup and Usage 3