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MAX3671ETN

Low-Jitter Frequency Synthesizer with Selectable Input Reference

Microsemi Corporation 

Low-Jitter Frequency Synthesizer

with Selectable Input Reference

Power Supply and Ground Connections

The MAX3671 has seven supply connection pins;

installation of a bypass capacitor at each supply pin is

recommended. All seven supply connections should be

driven from the same source to eliminate the possibility

of independent power-supply sequencing. Excessive

supply noise can result in increased jitter.

The 56-pin TQFN package features an exposed pad

(EP), which provides a low-resistance thermal path for

heat removal from the IC and must be connected to the

circuit board ground plane for proper operation.

VCC

VCC

REFCLKx, FB_IN

REFCLKx, FB_IN

200Ω

200Ω

ESD

STRUCTURES

VCC - 1.34V

> 20kΩ > 20kΩ

MAX3671

Figure 5. Equivalent LVPECL Input Circuit

VCC

+3.3V

+3.3V +3.3V

+3.3V

OUTxx

OUTxx

LVPECL

130Ω 130Ω

Z = 50Ω

Z = 50Ω

82Ω 82Ω

LVPECL

ESD

STRUCTURES

Figure 7. Thevenin Equivalent LVPECL Termination

MAX3671

Figure 6. Equivalent LVPECL Output Circuit

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