GS6151 datasheet(24/77 Pages) SEMTECH

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GS6151

Final Data Sheet

Rev.4

PDS-060389

August 2015

24 of 77

Semtech

Proprietary & Confidential

www.semtech.com

4.5.4 Output De-emphasis

The GS6151 features adjustable output de-emphasis to compensate for PCB dielectric

trace loss. Each output can be independently set to a different de-emphasis setting for

each detected rate through controls found in the DRIVER_CONTROL_REG_1 and

DRIVER_CONTROL_REG_2 registers.

The effect of de-emphasis, illustrated in Figure 4-3, is to attenuate the swing of bits that

do not follow a bit transition (VDE). The swing of bits that do follow a bit transition (Vnom)

is set by the output swing registers found in Section 4.5.3 and do not depend on the

de-emphasis settings.

Figure 4-3: De-emphasis Waveform

The default de-emphasis settings for each rate are given in the register descriptions for

DRIVER_CONTROL_REG_1 and DRIVER_CONTROL_REG_2 in Table 5-1. De-emphasis is

disabled on both outputs in Bypass mode, when the output is muted, or when the

device is not locked.

1101b

630

840

1050

1110b

670

890

1110

1111b

700

930

1160

Note:

1. Applicable registers that can be programmed with the values shown above are DDO0_SWING_1G485,

DDO0_SWING_270M, DDO0_SWING_125M, DDO0_SWING_BYPASS, DDO0_SWING_MUTE,

DDO0_SWING_5G94, DDO0_SWING_2G97, DDO1_SWING_1G485, DDO1_SWING_270M,

DDO1_SWING_125M, DDO1_SWING_BYPASS, DDO1_SWING_MUTE, DDO1_SWING_5G94, and

DDO1_SWING_2G97

Table 4-4: Serial Digital Output Swing Settings (Continued)

(See Note 1)

Min

Typ

Max

Units

Nominal

Swing (V

nom)

De-emphasized

Swing (V

DE)

De-emphasis = 20 x log

10(Vnom / VDE)

Data Pattern

111

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