V

I,DIFF

V

ICM = VIH

V

CM

VDD

X_INN

X_INP

GND

CDCLVC1310

SCAS917E – JULY 2011 – REVISED JANUARY 2014

www.ti.com

Differential Input Level

NOTE: The calculation for VCM is: VCM = VDD – VICM – VI,DIFF/2

Figure 19. Differential Input Level

Power Considerations

The following power consideration refers to the device-consumed power consumption only. The device power

consumption is the sum of static power and dynamic power. The dynamic power usage consists of two

components:

•

Power used by the device as it switches states

•

Power required to charge any output load

The output load can be capacitive-only or capacitive and resistive. Use the following formula to calculate the

power consumption of the device:

PDev = Pstat + Pdyn + PCload (see Figure 20 and Figure 21)

Pstat = IDD × VDD

Pdyn + PCload = (IDD,dyn + IDD,Cload) × VDDO

where:

IDD,dyn = CPD × VDDO × f × n [mA] (see Figure 22)

IDD,Cload = Cload × VDDO × f × n [mA]

Example for power consumption of the CDCLVC1310: 10 outputs are switching, f = 100 MHz, VDD = VDDO = 3.3

V and assuming Cload = 2 pF per output:

PDev = 46.2 mW + 117.5 mW = 163.7 mW

Pstat = 14 mA × 3.3 V = 46.2 mW

Pdyn + PCload = (29 mA + 6.6 mA) x 3.3 V = 117.5 mW

IDD,dyn = 8.8 pF × 3.3 V × 100 MHz × 10 = 29 mA

IDD,Cload = 2 pF × 3.3 V x 100 MHz × 10 = 6.6 mA

NOTE

For dimensioning the power supply, consider the total power consumption. The total

power consumption is the sum of device power consumption and the power consumption

of the load.

18

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