ADS5481 datasheet(21/35 Pages) TI

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Clock Inputs

CLKP

CLKM

ADS548x

SquareWaveor

SineWave

0.01 F

S0168-08

ADS5481

ADS5482, ADS5483

www.ti.com ...................................................................................................................................................................................................... SLAS565 – JUNE 2008

The ADS548x equivalent clock input circuit is shown in Figure 39. The clock inputs can be driven with either a

differential clock signal or a single-ended clock input, but differential is highly recommended. The characterization

of the ADS548x is typically performed with a 3-VPP differential clock, but the ADC performs well with a differential

clock amplitude down to ~1 VPP, as shown in Figure 41 and Figure 42 . The clock amplitude becomes more of a

factor in performance as the analog input frequency increases. When single-ended clocking is a necessity, it is

best to connect CLKM to ground with a 0.01-

µF capacitor, while CLKP is ac-coupled with a 0.01-µF capacitor to

the clock source, as shown in Figure 42.

Figure 39. Clock Input Circuit

Figure 40. Single-Ended Clock

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