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| GS3140 Datasheet, PDF (17/40 Pages) Semtech Corporation – Multi-Rate Adaptive 3G SDI Equalizer | |||
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The output is compatible with industry standard PECL, LVPECL, LVDS, and CML
differential receivers when AC coupled using Semtechâs recommended application
circuit.
4.9.1 Adjustable Output Swing and De-Emphasis
The serial digital output swing is user-selectable from approximately 250mVppd to
1Vppd in increments of 50mVppd. For exact values see Table 4-2.
Table 4-2: Serial Digital Output Swing
OUTPUT_SWING
Min
Typ
0000b
0001b
0010b
0011b
0100b
0101b
0110b
0111b
1000b
1001b
1010b
1011b
1100b
1101b
1110b
1111b
190
230
230
275
275
325
310
370
345
410
390
460
435
510
480
560
515
605
555
655
590
705
630
755
665
800
695
840
745
890
800
930
Max
270
320
375
430
475
530
585
640
695
755
820
880
935
985
1035
1060
Units
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
To support driving long PCB traces, the GS3140 differential output buffer includes
programmable de-emphasis with 8 operating levels between 0dB - 18.1dB. The
de-emphasis delay can also be programmed to either 100ps or 200ps.
A second set of de-emphasis level and delay values, specifically targeted for 2.97Gb/s
signals, can be selected either manually using the MANUAL_DEEMPHASIS_SELECT bit or
automatically using the AUTO_DEEMPHASIS_ENABLE bit in OUT_CONF_REG_0
accessible through the device's host interface.
GS3140
Final Data Sheet
PDS-060939
Rev.1
May 2015
www.semtech.com
17 of 40
Semtech
Proprietary & Confidential
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