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參數(shù)資料
| 型號： | AD8628ARTZ-REEL7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運(yùn)動控制電子 |
| 英文描述： | Zero-Drift, Single-Supply, Rail-to-Rail Input/Output Operational Amplifier |
| 中文描述： | OP-AMP, 10 uV OFFSET-MAX, 2.5 MHz BAND WIDTH, PDSO5 |
| 封裝： | ROHS COMPLIANT, MO-178AA, SOT-23, 5 PIN |
| 文件頁數(shù)： | 17/20頁 |
| 文件大?。?/td> | 476K |
| 代理商： | AD8628ARTZ-REEL7 |
AD8628/AD8629
Rev. C | Page 17 of 20
TIME (500
μ
s/DIV)
V
V
OUT
0V
0V
V
IN
0
CH1 = 50mV/DIV
CH2 = 1V/DIV
A
V
= –50
Figure 59. Negative Input Overload Recovery for the AD8628
TIME (500
μ
s/DIV)
V
V
OUT
0V
0V
V
IN
0
CH1 = 50mV/DIV
CH2 = 1V/DIV
A
V
= –50
Figure 60. Negative Input Overload Recovery for LTC2050
TIME (500
μ
s/DIV)
V
V
OUT
0V
0V
V
IN
0
CH1 = 50mV/DIV
CH2 = 1V/DIV
A
V
= –50
Figure 61. Negative Input Overload Recovery for LMC2001
The results shown in Figure 56 to Figure 61 are summarized in
Table 5.
Table 5. Overload Recovery Time
Positive Overload
Recovery (μs)
AD8628
6
LTC2050
650
LMC2001
40,000
Product
Negative Overload
Recovery (μs)
9
25,000
35,000
INFRARED SENSORS
Infrared (IR) sensors, particularly thermopiles, are increasingly
being used in temperature measurement for applications as
wide-ranging as automotive climate control, human ear
thermometers, home insulation analysis, and automotive repair
diagnostics. The relatively small output signal of the sensor
demands high gain with very low offset voltage and drift to
avoid dc errors.
If interstage ac coupling is used (Figure 62), low offset and drift
prevents the input amplifier’s output from drifting close to
saturation. The low input bias currents generate minimal errors
from the sensor’s output impedance. As with pressure sensors,
the very low amplifier drift with time and temperature elimi-
nates additional errors once the temperature measurement has
been calibrated. The low 1/f noise improves SNR for dc
measurements taken over periods often exceeding 1/5 s.
Figure 64 (shows a circuit that can amplify ac signals from
100 μV to 300 μV up to the 1 V to 3 V level, with gain of
10,000 for accurate A/D conversion.
5V
100k
10k
5V
100
μ
V – 300
μ
V
100
TO BIAS
VOLTAGE
10k
f
C
≈
1.6Hz
IR
DETECTOR
100k
10
μ
F
1/2 AD8629
1/2 AD8629
0
Figure 62. AD8629 Used as Preamplifier for Thermopile
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