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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(chǔ) Shutdown(85ksps,單通道,14位串行A/D轉(zhuǎn)換器) |
| 中文描述： | 14位、85ksps ADC，帶有10µ關(guān)斷 |
| 文件頁數(shù)： | 14/24頁 |
| 文件大?。?/td> | 267K |
| 代理商： | MAX194 |
M
REF and AIN Input Protec tion
The REF and AIN signals should not exceed the
MAX194 supply rails. If this can occur, diode clamp the
signal to the supply rails. Use silicon diodes and a 10
current-limiting resistor (Figures 10 and 12) or Schottky
diodes without the resistor.
When using the current-limiting resistor, place the resis-
tor between the appropriate input (AIN or REF) and any
bypass capacitor. While this results in AC transients at
the input due to dynamic input currents, the transients
settle quickly and do not affect conversion results.
Improperly placing the bypass capacitor directly at the
input forms an RC lowpass filter with the current-limiting
resistor, which averages the dynamic input current and
causes linearity errors.
Analog Input
The MAX194 uses a capacitive DAC that provides an
inherent track/hold function. The input impedance is
typically 30
in series with 250pF in unipolar mode and
50
in series with 125pF in bipolar mode.
Input Range
The analog input range can be either unipolar (0V to
V
REF
) or bipolar (-V
REF
to V
REF
), depending on the
state of the BP/UP/SHDN pin (see Digital Interface sec-
tion). The reference range is 0V to VDDA. When choos-
ing the reference voltage, the equivalent MAX194 input
noise (40μV
RMS
in unipolar mode, 80μV
RMS
in bipolar
mode) should be considered.
14-Bit, 85ksps ADC with 10μA S hutdown
14
______________________________________________________________________________________
MAX427
4
7
6
2
2
3
IN
+15V
-15V
0.0033
μ
F
0.1
μ
F
0.1
μ
F
ELANTEC
EL2003
4
1
7
+15V
-15V
0.1
μ
F
0.1
μ
F
100pF
1k
1k
1N914
1N914
+5V
-5V
AIN
10
MAX400
4
7
6
2
3
IN
+15V
-15V
1.0
μ
F
0.1
μ
F
0.1
μ
F
1000pF
1k
100
AIN
1N914
1N914
+5V
-5V
10
Figure 14. MAX400 Drives AIN for Low-Frequency Use
Figure 15. AIN Buffer for AC/DC Use
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