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参数资料
| 型号： | ADC0831CIWM |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | ADC |
| 英文描述： | 1-CH 8-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO14 |
| 封装： | PLASTIC, SOIC-14 |
| 文件页数： | 5/24页 |
| 文件大小： | 509K |
| 代理商： | ADC0831CIWM |
Functional Description (Continued)
3.0 REFERENCE CONSIDERATIONS
The voltage applied to the reference input on these convert-
ers, V
REFIN, defines the voltage span of the analog input
(the difference between V
IN(MAX) and VIN(MIN) over which the
256 possible output codes apply. The devices can be used
either in ratiometric applications or in systems requiring ab-
solute accuracy. The reference pin must be connected to a
voltage source capable of driving the reference input resis-
tance which can be as low as 1.3k
. This pin is the top of a
resistor divider string and capacitor array used for the suc-
cessive approximation conversion.
In a ratiometric system the analog input voltage is propor-
tional to the voltage used for the A/D reference. This voltage
is typically the system power supply, so the V
REFIN pin can
be tied to V
CC. This technique relaxes the stability require-
ments of the system reference as the analog input and A/D
reference move together maintaining the same output code
for a given input condition.
For absolute accuracy, where the analog input varies be-
tween very specific voltage limits, the reference pin can be
biased with a time and temperature stable voltage source.
For the ADC08034 and the ADC08038 a band-gap derived
reference voltage of 2.6V (Note 8) is tied to V
REFOUT. This
can be tied back to V
REFIN. Bypassing VREFOUT with a
100F capacitor is recommended. The LM385 and LM336
reference diodes are good low current devices to use with
these converters.
The maximum value of the reference is limited to the V
CC
supply voltage. The minimum value, however, can be quite
small (see Typical Performance Characteristics) to allow di-
rect conversions of transducer outputs providing less than a
5V output span. Particular care must be taken with regard to
noise pickup, circuit layout and system error voltage sources
when operating with a reduced span due to the increased
sensitivity of the converter (1 LSB equals V
REF/256).
8 Single-Ended
DS010555-48
8 Pseudo-Differential
DS010555-49
4 Differential
DS010555-50
Mixed Mode
DS010555-51
FIGURE 1. Analog Input Multiplexer Options for the ADC08038
www.national.com
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| ADC0831-N | 制造商:TI 制造商全称:Texas Instruments 功能描述:ADC0831/ADC0832/ADC0834/ADC0838 8-Bit Serial I/O A/D Converters with Multiplexer Options |
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