CDCLVC1310 datasheet(18/28 Pages) TI1

18 / 28 page

I,DIFF

ICM = VIH

VDD

X_INN

X_INP

GND

CDCLVC1310

SCAS917B

– JULY 2011 – REVISED FEBRUARY 2012

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Differential Input Level

NOTE: VCM can be calculated with: VCM = VDD – VICM – VI,DIFF/2

Figure 19. Differential Input Level

Power Consideration

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. The following formula can be used 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 3.3V = 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, the total power consumption must be considered. The

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

consumption of the load.

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