GS6151 Datasheet, PDF (23/77 Pages) Semtech Corporation – Multi-Rate 6G UHD-SDI

4.5.1 Output Impedance
Each of the GS6151’s output buffers include two on-chip, 50Ω termination resistors.
4.5.2 Output Signal Interface Levels
The serial digital outputs operate within specification with an output CML power supply
of 1.2V to 2.5V.
4.5.3 Adjustable Output Swing
Through the GSPI, the output swing can be set in the range from approximately
230mV_ppd to 930mV_ppd in 45mV_ppd increments, when the outputs are terminated with
50Ω loads. For the exact values, please see Table 4-4 below.
The output swing for each data rate is controlled using the bits in the
DRIVER_CONTROL_REG_3, DRIVER_CONTROL_REG_4, DRIVER_CONTROL_REG_5, and
DRIVER_CONTROL_REG_6 registers at addresses 1C_h through 1F_h.
The device automatically adjusts the swing setting depending on the state of the device
(i.e. detected rate, bypass mode, or mute). There are separate register controls for mute,
bypass and each data rate.
Table 4-4: Serial Digital Output Swing Settings
Register Setting
(See Note 1)
Min
Typ
Max
0000_b
175
230
290
0001_b
205
275
345
0010_b
245
325
405
0011_b (default)
280
370
460
0100_b
310
410
510
0101_b
345
460
575
0110_b
380
510
640
0111_b
420
560
700
1000_b
455
605
760
1001_b
490
655
820
1010_b
530
705
880
1011_b
565
755
945
1100_b
600
800
1000
Units
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
GS6151
Final Data Sheet
PDS-060389
Rev.4
August 2015
www.semtech.com
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