AD9000 데이터 시트보기 (PDF) - Analog Devices

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AD9000

High Speed 6-Bit A/D Converter

Analog Devices 

TYPICAL APPLICATION

The AD9000 is a relatively flexible device that can be config-

ured in a number of ways. One very useful feature of the

AD9000 is the open emitter outputs. The open emitters allow

the outputs of several AD9000s to be OR-wired in stacking

applications for increased resolution. This kind of application

depends on the return-to-zero nature of the output bits when

AIND≥ + VREF (overflow). In circuits that employ only one

AD9000, this is not always an advantage. The circuit below

illustrates one method of converting the outputs to nonreturn-

to-zero.

The 10197 (standard 10K ECL logic) hex-AND group senses

the active OVERFLOW output and forces all other bits to logic

AD9000

HIGH. The 10151 latch is not required for AD9000 applica-

tions, but it may ease data transfer sensitivities in asynchronous

data collection systems.

The reference driver circuits should provide a low source im-

pedance to prevent noise on the reference inputs from affecting

the AD9000’s accuracy. This is accomplished to a large extent

by adequately decoupling the reference pins to ground. An

improved method is employed below. The reference voltages

(+VREF, –VREF) are buffered by a transistor/amplifier combina-

tion. This has the advantages of wide bandwidth (hence low

impedance over a wide frequency range to eliminate high

frequency noise components), and improved temperature

stability.

REV. A

Figure 6.

–7–

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