EQCO62T20.3 datasheet(9/32 Pages) MICROCHIP

Part #	EQCO62T20.3

Description	EQCO62T20.3 6.25 Gbps Asymmetric Coax Driver

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Manufacturer	MICROCHIP [Microchip Technology]

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 2011-2016 Microchip Technology Inc.

DS60001301B-page 9

EQCO62T20.3/EQCO31T20.3

2.1

Guidelines for PCB Layout

When using the EQCO62T/R20 chipset at its full

purpose, including low-speed uplink and power supply

transmission, it is important not to disturb the RF-

performance of the high-speed downlink channel.

Implementing the circuit illustrated in Figure 2-1 with a

different PCB layout will in first instance not deliver full

data sheet performance. The simplest way of meeting

optimal performance, including jitter and return-loss

requirements, is to precisely follow the component and

layout recommendations. Note that at multi-gigabit

speeds, using "equivalent" components or small PCB

layout changes (even moving a via) can have significant

detrimental effects.

The easiest way for achieving the requirements of the

CoaXPress 1.1 specification is to use the recommended

circuits, components and layout illustrated in Figure 2-1.

For easy implementation, Microchip will provide the

Gerber file. Please ask for it by email.

2.1.1

RIGHT ANGLE BNC

Figure 2-2 below shows the four layers of the

recommended footprint for the EQCO62T20.3 chip

and the off-chip components that are critical for the

RF-performance of the system.

FIGURE 2-2:

RECOMMENDED PCB LAYOUT FOR EQCO62T20.3

Note:

Email address: coaxpress@microchip.com

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