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參數(shù)資料
| 型號(hào)： | ADC1205CCJ |
| 廠(chǎng)商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類(lèi)： | ADC |
| 英文描述： | NiCd/NiMH Gas Gauge W/1-Wire (DQ) I/F, 5 LED Drivers, Control Signals For BQ2004 Fast-Charge IC 16-SOIC 0 to 70 |
| 中文描述： | 1-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, CDIP24 |
| 封裝： | CERAMIC, DIP-24 |
| 文件頁(yè)數(shù)： | 14/18頁(yè) |
| 文件大小： | 327K |
| 代理商： | ADC1205CCJ |
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Functional Description
(Continued)
A simpler, although slightly less accurate, approach is to
ground V
IN(
a
)
and V
IN(
b
)
, and adjust for all zeros at the
output. Error will be well under
(/2
LSB if the adjustment is
done so that the potentiometer is ‘‘centered’’ within the
0,000,000 range. A positive voltage at the V
OS
input will
reduce the output code. The adjustment range is
a
4 to
b
30 LSB.
TL/H/5676–11
FIGURE 15. Zero Adjust Circuit
7.2 POSITIVE AND NEGATIVE FULL-SCALE
ADJUSTMENT
Unipolar Inputs
Apply a differential input voltage which is 1.5 LSB below the
desired analog full-scale voltage (V
F
) and adjust the magni-
tude of the V
REF
input so that the output code is just chang-
ing from 0,1111,1111,1110 to 0,1111,1111,1111.
Bipolar Inputs
#
V
X
b
D
Do the same procedure outlined above for the unipolar case
and then change the differential input voltage so that the
digital output code is just changing from 1,0000,0000,0001
to 1,0000,0000,0000. Record the differential input voltage,
V
X
. the ideal differential input voltage for that transition
should be;
b
V
F
a
V
F
8192
2
J
Calculate the difference between Vx and the ideal voltage;
D
e
V
X
b
b
V
F
a
V
F
8192
Then apply a differential input voltage of;
and adjust the magnitude of V
REF
so the digital output
code
is
just
changing
from
1,0000,0000,0000. That will obtain the positive and negative
full-scale transition with symmetrical minimum error.
1,0000,0000,0001
to
Typical Applications
*
Input must have some
current return path to
signal ground
TL/H/5676–12
14
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|---|---|
| ADC1205CCJ/A+ | 制造商:未知廠(chǎng)家 制造商全稱(chēng):未知廠(chǎng)家 功能描述:Analog-to-Digital Converter， 13-Bit |
| ADC1205CCJ1 | 制造商:NATIONAL 功能描述:New |
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| ADC1205CCJ-1/A+ | 制造商:未知廠(chǎng)家 制造商全稱(chēng):未知廠(chǎng)家 功能描述:Analog-to-Digital Converter， 13-Bit |
| ADC12062 | 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:12-Bit, 1 MHz, 75 mW A/D Converter |
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