CS5529-AP(1997) Просмотр технического описания (PDF) - Cirrus Logic

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CS5529-AP
(Rev.:1997)

16-Bit, Programmable ∆Σ ADC with 6-Bit Latch

Cirrus Logic 

CS5529

FAQs

17) If the charge pump is engaged, how do I ensure that the converter and its

external components are intrinsically safe?

A: Intrinsic safety prohibits the use of electrolytic (or bipolar) capacitors

thus limiting the use of certain size capacitors. Although a 10 µF cap. is

recommended for the charge pump, two 0.47 µF ceramic caps in parallel

can be used.

18) What benefit does an evaluation board offer?

A: The CDB5525/26 evaluation board saves time and money over prototyp-

ing. The preassembled board comes equipped with an 80C51 microcon-

troller and a 9-pin cable to link the evaluation board to a PC-compatible

computer. The evaluation system also includes software which provides

easy access to the internal registers of the converter and displays the con-

verter’s time domain, frequency domain and noise histogram perfor-

mance.

19) How do the analog power supply configurations differ between the

CS5525/26 and the CS5529?

A: The CS5525/26 converters can be powered from a single +5 V analog

supply and either a +5 V or +3.3 V digital supply. They have a charge

pump which uses two external diodes and two external capacitors to gen-

erate a negative supply (a negative bias voltage) allowing digitization of

ground-referenced signals. The negative bias voltage can be supplied

from a separate negative supply, if desired. The CS5529 A/D converter

is designed to operate from a single +5 V or a dual ±2.5 V analog supply

and either a +5 V or +3.3 V digital supply. Since the CS5529 can be

powered from a negative analog supply, level shifting circuitry can be

eliminated when measuring ground-referenced signals.

8

PI246PP1 OCT ‘97

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