GS6151 datasheet(25/77 Pages) SEMTECH

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GS6151

Final Data Sheet

Rev.4

PDS-060389

August 2015

25 of 77

Semtech

Proprietary & Confidential

www.semtech.com

4.5.5 Output Common Mode Voltage

The output common mode voltage level (VCMOUT) is a function of the output voltage

swing, the output driver supply voltage (VCC_DDO) and how the transmission line is

terminated. If the outputs are terminated through 50

Ω resistors to a voltage V

TERM

equal to VCC_DDO, as shown in Figure 4-5 below, the output common mode voltage is

given by the following expression:

Equation 4-2

If the differential outputs are terminated across a 100

Ω resistor, as shown in Figure 4-4

below, the output common mode voltage is given by the following expression:

Equation 4-3

4.6 Output Mute and Disable

The GS6151 outputs can each be individually muted using the DDO0_MUTE and

DDO1_MUTE bits in the DRIVER_CONTROL_REG_0 register at address 19h.

Each output can also be independently disabled through either register or GPIO control.

When disabled each pin of the output is pulled to VCC_DDO. Register

DRIVER_CONTROL_REG_0 contains both register based disable bits (DDO0_DISABLE,

DDO1_DISABLE) and bits for selection between register and GPIO control

(DDO0_DISABLE_SELECT, DDO1_DISABLE_SELECT). For GPIO control refer to

Section 4.10. By default DDO0, DDO0 is enabled/disabled through register control and

set to enabled. DDO1, DDO1 is enabled by default.

VCMOUT

VCC_DDO

ΔV

DDO

------------------

–

VCMOUT

VCC_DDO

ΔV

DDO

------------------

–

Figure 4-4: 100

Ω Parallel Output Termination

Figure 4-5: 50

Ω Termination to V

TERM

100Ω

50Ω

DDO

VCC_DDO

50Ω

DDO

VCC_DDO

GS6151

DDO

50Ω

DDO

VCC_DDO

50Ω

DDO

VCC_DDO

50Ω

GS6151

TERM

50Ω

DDO

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