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參數(shù)資料
| 型號： | HI7133CPL |
| 廠商： | HARRIS SEMICONDUCTOR |
| 元件分類： | ADC |
| 英文描述： | Power Resistor; Series:200; Resistance:4.5kohm; Resistance Tolerance: 5%; Power Rating:8W; Resistor Element Material:Ceramic; Temperature Coefficient:260 ppm; Leaded Process Compatible:No; Packaging:Bulk RoHS Compliant: No |
| 中文描述： | DUAL-SLOPE ADC, PARALLEL ACCESS, PDIP40 |
| 文件頁數(shù)： | 16/21頁 |
| 文件大小： | 209K |
| 代理商： | HI7133CPL |
3-1841
In many applications where the A/D is connected to a trans-
ducer, there will exist a scale factor other than unity between
the input voltage and the digital reading. For instance, in a
weighing system, the designer might like to have a full scale
reading when the voltage from the transducer is 0.682V.
Instead of dividing the input down to 200.0mV, the designer
should use the input voltage directly and adjust the V
REF
for
0.341V. Suitable values for integrating resistor and capacitor
would be 620k
and 0.047
μ
F. This makes the system slightly
quieter and also avoids a divider network on the input.
The on-chip voltage reference (V+ - V
COMMON
) is normally
used to provide the converter reference voltage. However,
some applications may desire to use an external reference
generator. Various possible schemes exist for reference volt-
age settings. Figure 11 shows the normal way of using on-
chip reference and also a way of using external reference.
The value of resistors on both circuit depends on the con-
verter input voltage range. Refer to “Typical Applications”
section for various schemes.
Typical Applications
The HI7131 and HI7133 A/D Converters may be used in a
wide variety of configurations. The following application
circuits show some of the possibilities, and serves to illus-
trate the exceptional versatility of these devices.
The following application notes contain very useful informa-
tion on understanding and applying these parts and are
available from Intersil Corporation.
Application Notes
NOTE #
DESCRIPTION
AnswerFAX
DOC. #
AN016
“Selecting A/D Converters”
9016
AN017
“The Integrating A/D Converter”
9017
AN018
“Do’s and Don’ts of Applying A/D
Converters”
9018
AN032
“Understanding the Auto-Zero and
Common Mode Performance of the
ICL7136/7/9 Family”
9032
AN052
“Tips for Using Single Chip 3
1
/
2
Digit A/D
Converters”
9052
HI7131/33
V+
REF HI
REF LO
COMMON
See “Typical Applications” section for
resistance values for different ranges.
V+
HI7131/33
V+
REF HI
REF LO
COMMON
V+
ICL8069
1.2V
REFERENCE
27K
20k
FIGURE 99. HI7131 TYPICAL REFERENCE CIRCUITS
HI7131, HI7133
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