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參數(shù)資料
| 型號： | MAX194 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 14-Bit, 85ksps ADC with 10礎 Shutdown(85ksps,單通道,14位串行A/D轉換器) |
| 中文描述： | 14位、85ksps ADC，帶有10µ關斷 |
| 文件頁數(shù)： | 12/24頁 |
| 文件大小： | 267K |
| 代理商： | MAX194 |
M
be improved by trimming, but the drift is too great to
provide good stability over temperature. The MAX427
buffer provides the necessary drive current to stabilize
the REF input quickly after capacitance changes.
The reference inaccuracies contribute additional full-
scale error. A reference with less than
1
2
14
total error
(61 parts per million) over the operating temperature
range is required to maintain full 14-bit accuracy. The
MAX676, which utilizes an on-chip ROM to calibrate for
drift, achieves a drift specification of 1ppm/°C and easi-
ly drives the REF input directly. This allows large tem-
perature changes with less than 1LSB error. While the
MAX676’s initial-accuracy specification (0.01%) results
in a maximum error of about ±2LSB, the reference volt-
age can be trimmed or the offset can be corrected in
software if absolute DC accuracy is essential. Figure
11’s circuit provides outstanding temperature stability
as well as excellent DC accuracy if the initial error is
corrected.
14-Bit, 85ksps ADC with 10μA S hutdown
12
______________________________________________________________________________________
14
16
15
12
MAX194
MAX427
AGND
VSSA
VDDA
4
4
7
6
8
6
2
2
3
MAX874
GND
V
IN
COMP
V
OUT
4.096V
+15V
-15V
47
μ
F
LOW
ESR
0.1
μ
F
0.1
μ
F
0.1
μ
F
0.1
μ
F
1000pF
0.1
μ
F
0.1
μ
F
1k
10
2k
REF
1N914
1N914
10
-5V
+5V
MAX194
MAX676
+5V
GND
AGND
47
μ
F
LOW
ESR
0.1
μ
F
0.0047
μ
F
10
μ
F
0.1
μ
F
V
CC
REF
COMP
FORCE
SENSE
18
3
1
12
14
20
10, 11
Figure 10. Typical Reference Circuit for AC Accuracy
Figure 11. MAX676 Provides High-Accuracy +4.096V Reference
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