VID = 0 V

VOD = 0 V

t PLHD

t PHLD

IN

OUT

t

=|t

– 1/f |

jit(pp)

c(n)

O

1/f

O

1/f

O

<3-inch,50-

TL

(7,62cm)

W

<3-inch,50-

TL

(7,62cm)

W

25-inchFR4

(63,5cm)

DC

Block

DC

Block

DC

Block

DC

Block

Coax

Coax

Coax

Coax

D+

D–

Pattern

Generator

400-mV

Differential

PP

Characterization TestBoard

Jitter Test

Instrument

Coupled

TransmissionLine

SMA

SMA

SMA

SMA

SMA

SN65LVCP204

SN65LVCP204

PARAMETER MEASUREMENT INFORMATION (continued)

Figure 6. Propagation Delay Input to Output

A.

All input pulses are supplied by an Agilent 81250 Stimulus System.

B.

The measurement is made with the AgilentParBert measurement software.

Figure 7. Driver Jitter Measurement Waveforms

Figure 8. AC Test Circuit — Jitter and Output Rise Time Test Circuit

The SN65LVCP204 input equalizer provides 5-dB frequency gain to compensate for the frequency loss of a

shorter backplane transmission line. For characterization purposes, a 25-inch (63,5 cm) FR-4 coupled

transmission line is used in place of the backplane trace. The 25-inch trace provides roughly 5 dB of attenuation

between 375 MHz and 2.125 GHz, representing closely the characteristics of a short backplane trace. The loss

tangent of the FR4 in the test board is 0.018 with an effective

ε(r) of 4.1.

Copyright © 2009, Texas Instruments Incorporated

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