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ADC0833 Просмотр технического описания (PDF) - National ->Texas Instruments

Номер в каталогеADC0833 National-Semiconductor
National ->Texas Instruments National-Semiconductor
Компоненты Описание8-Bit Serial I/O A/D Converter with 4-Channel Multiplexer
ADC0833 Datasheet PDF : 20 Pages
First Prev 11 12 13 14 15 16 17 18 19 20
Functional Description (Continued)
This zener is intended for use as a shunt voltage regulator
to eliminate the need for any additional regulating compo-
nents This is most desirable if the converter is to be re-
motely located from the system power source Figures 4
and 5 illustrate two useful applications of this on-board ze-
ner when an external transistor can be afforded
An important use of the interconnecting diode between Va
and VCC is shown in Figures 6 and 7 Here this diode is
used as a rectifier to allow the VCC supply for the converter
to be derived from the clock The low current requirements
of the A D (E3 mA) and the relatively high clock frequen-
cies used (typically in the range of 10k-400 kHz) allows us-
ing the small value filter capacitor shown to keep the ripple
on the VCC line to well under of an LSB The shunt zener
regulator can also be used in this mode This requires a
clock voltage swing which is in excess of VZ A current limit
for the zener is needed either built into the clock generator
or a resistor can be used from the CLK pin to the Va pin
TL H 5607 – 15
FIGURE 4 Operating with a Temperature
Compensated Reference
TL H 5607 – 16
FIGURE 5 Using the A D as the
System Supply Regulator
TL H 5607 – 17
Note 4 5V s VCC s 6 3V
FIGURE 6 Generally VCC from the Converter Clock
TL H 5607 – 9
FIGURE 7 Remote Sensing Clock
and Power on 1 Wire
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