VSC7440 datasheet(402/444 Pages) MICROSEMI

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Electrical Specifications

VMDS-10492 VSC7440 Datasheet Revision 4.2

385

The specifications in the following table correspond to 10G transmitter output, SFI point B for direct

attach copper and an SFF-8431-compliant SFI channel with no more than 3 dB channel loss.

The specifications in the following table correspond to 10G receiver input, SFI point C for direct attach

copper.

Eye mask X1

0.121

Measured at 5e–5 mask hit ratio.

Eye mask X2

0.33

Measured at 5e–5 mask hit ratio.

Eye mask Y1

Measured at 5e–5 mask hit ratio.

Maximum 3 dB SFI channel loss.

Eye mask Y2

350

Differential output return loss

SDD22

–12

0.01 GHz to 2 GHz.

Differential output return loss

SDD22

See note 2

2 GHz to 11.1 GHz.

Common-mode return loss3

SCC22

See note4

0.01 GHz to 2.5 GHz.

Common-mode return loss3

SCC22

–3

2.5 GHz to 11.1 GHz.

This value is met when the device’s maximum junction temperature is below 110 °C.

Return loss value is given by the equation SDD22(dB) <–6.68 + 12.1 log10(ƒ/5.5 GHz).

The test set common-mode reference impedance is 25

Ω.

Return loss value is given by the equation SCC22(dB) < –7 + 1.6 x ƒ/GHz,

Table 300 •

10G Transmitter Output (SFI Point B, Host) for Direct Attach Copper

Parameter

Symbol Minimum

Maximum

Unit

Condition

Voltage modulation amplitude,

peak-to-peak

VMA

300

SFF-8431 section D.7. Maximum

3 dB SFI channel loss.

Transmitter QSQ

QSQ

63.1

QSQ = 1/RN if the 1 and 0 level

noises are identical. See

SFF-8431, section D.8.

Output AC common-mode voltage

121

This value is met when the device’s maximum junction temperature is below 110 °C.

mVRMS See SFF-8431 section D.15.

Output TWDPc

TWDPc

10.71

dBe

Host electrical output measured

using SFF-8431 Appendix G,

including copper direct attach

stressor. Maximum 3 dB SFI

channel loss.

Table 301 •

10G Receiver Input (SFI Point C, Host) for Direct Attach Copper

Parameter

Symbol Typical

Unit

Condition

Waveform distortion penalty of ISI

generator

WDPc

9.3

dBe

Copper stressor according to SFF-8431

section E.3.1.

Transmitter QSQ

QSQ

63.1

QSQ = 1/RN if the 1 and 0 level noises

are identical. See SFF-8431, section D.8.

Table 299 •

10G Transmitter Output (SFI Point B, Host) (continued)

Parameter

Symbol Minimum

Maximum

Unit

Condition

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