ADS62P45 datasheet(46/67 Pages) TI

Part #	ADS62P45

Description	Dual Channel 14-Bit, 125/105/80/65 MSPS ADC with Parallel CMOS/DDR LVDS outputs

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Manufacturer	TI [Texas Instruments]

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46 / 67 page

ADS62P45, ADS62P44

ADS62P43, ADS62P42

REV1P0 SEP 2007

46

www.ti.com

PRODUCT PREVIEW information concerns products in

the formative or design phase of development.

Characteristic data and other specifications are design

goals. Texas Instruments reserves the right to change or

discontinue these products without notice.

CLOCK INPUT

The clock inputs can be driven differentially (SINE, LVPECL or LVDS) or single-ended (LVCMOS), with little or no difference in

performance between them. The common-mode voltage of the clock inputs is set to VCM using internal 5 kΩ resistors as

shown in Figure

16. This allows using transformer-coupled drive circuits for sine wave clock or ac-coupling for LVPECL, LVDS

clock sources (Figure 18 and Figure 19).

CLKP

5 kE

VCM

5 kE

6 pF

10 E

Lpkg

~ 2 nH

Cbond

~ 1 pF

Lpkg

~ 2 nH

Cbond

~ 1 pF

Resr

~ 100 E

Resr

~ 100 E

CLKM

Clock buffer

Ceq

Ceq ~ 1 to 3 pF, equivalent input capacitance of clock buffer

Figure 16 Internal Clock buffer

TBD

Figure 17 Clock Input Impedance

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ADS62P45 Datasheet(PDF) 46 Page - Texas Instruments

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