Intel LXD972M manual Power Supply Voltage Source and Clock Options

Intel® LXD972M Transceiver Demo Board (Board Rev A1)

2.4.2Power Supply Voltage Source and Clock Options

Table 4 lists banana lead power connectors (BNn) for the LXD972M Demo Board. For details on the power supplies, see the schematic in Chapter 3.0, “Intel® LXD972M Demo Board Schematics”.

Table 4. Power Supply Voltage Source Connector Options

Reference	Signal	Supply Description
Designators
BN1	VCC	+3.3V.
		For components on the LXD972M Demo Board other than LXT972M Transceiver.
BN2	GND	Ground
BN3	VCCIO	+3.3V or +2.5V.
		I/O voltage for the LXT972M Transceiver.
		+3.3V.
BN4	VCCD	LXT972M digital power. If JP12 jumper is on, analog power is provided for the
		LXT972M Transceiver.

Table 5 lists internal and external jumper settings to configure the power supply source for the transmit magnetic center-tap voltage.

Table 5. Magnetic Center-Tap Voltage Source Configuration Options

Desired	Setting	Description
Power Supply Source
3.3V Power Supply from	Jumper	Use Jumper JP4 to apply 3.3V power from VCCA for center-tap
VCCA	JP4	operation.
Alternate Power Supply	Open	Use Jumper JP4 to supply either 2.5V or 3.3V power supply for
	JP4	center-tap operation. Connect the power supply to pin 2 of JP4.

Table 6 lists the LXT972M Demo Board analog power supply (VCCA) configuration options.

Table 6. Analog Power Supply (VCCA) Configuration Options

	Desired	Setting		Description
Configuration
	3.3V Power	Jumper	Use Jumper JP12 to route power from the VCCD Power Connector
	Supply to VCCA	JP12	(BN4) through JP12 to the VCCA input of the LXT972M Transceiver.
Analog	External Power	Open	1.	Remove jumper from JP12 to disable for VCCA input.
			2.	Apply external power from an alternate power supply through
	Supply to VCCA	JP12		pin 2 of JP12. For power supply requirements, see the LXT972M
				Transceiver datasheet.

12 Preliminary User’s Guide

Document Number: 303125

Revision Number: 002

Revision Date: October 22, 2004