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AD9000JD Arkusz danych(PDF) 7 Page - Analog Devices |
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AD9000JD Arkusz danych(HTML) 7 Page - Analog Devices |
7 / 8 page AD9000 –7– REV. A 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 ≥ + V REF (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 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. Figure 6. |
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