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參數(shù)資料
| 型號： | AD621S |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | 運動控制電子 |
| 英文描述： | Low Drift, Low Power Instrumentation Amplifier |
| 中文描述： | 低漂移，低功耗儀表放大器 |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 663K |
| 代理商： | AD621S |
AD621
REV. A
–11–
3k‰
+5V
DIGITAL
DATA
OUTPUT
ADC
REF
IN
AGND
20k‰
10k‰
20k‰
AD621B
1.7mA
1.3mA
MAX
0.10mA
0.6mA
MAX
3k‰
3k‰
3k‰
4
AD705
2
1
8
3
7
6
5
Figure 31. A Pressure Monitor Circuit which Operates on a +5 V Power Supply
Pressure Measurement
Although useful in many bridge applications such as weigh-
scales, the AD621 is especially suited for higher resistance pres-
sure sensors powered at lower voltages where small size and low
power become more even significant.
Figure 31 shows a 3 k
pressure transducer bridge powered
from +5 V. In such a circuit, the bridge consumes only 1.7 mA.
Adding the AD621
and a buffered voltage divider allows the sig-
nal to be conditioned for only 3.8 mA of total supply current.
Small size and low cost make the AD621 especially attractive for
voltage output pressure transducers. Since it delivers low noise
and drift, it will also serve applications such as diagnostic
noninvasion blood pressure measurement.
Wide Dynamic Range Gain Block Suppresses Large Common-
Mode and Offset Signals
The AD621 is especially useful in wide dynamic range applica-
tions such as those requiring the amplification of signals in the
presence of large, unwanted common-mode signals or offsets.
Many monolithic in amps achieve low total input drift and noise
errors only at relatively high gains (~100). In contrast the
AD621’s low output errors allow such performance at a gain of
10, thus allowing larger input signals and therefore greater
dynamic range. The circuit of Figure 32 (
±
15 V supply, G = 10)
has only 2.5
μ
V/
°
C max. V
OS
drift and 0.55
μ
/V p-p typical
0.1 Hz to 10 Hz noise, yet will amplify a
±
0.5 V differential sig-
nal while suppressing a
±
10 V common-mode signal, or it will
amplify a
±
1.25 V differential signal while suppressing a 1 V
offset by use of the DAC driving the reference pin of the
AD621. An added benefit, the offsetting DAC connected to the
reference pin allows removal of a dc signal without the associ-
ated time-constant of ac coupling. Note the representations of a
differential and common-mode signal shown in Figure 32 such
that a single-ended (or normal mode) signal of +1 V would be
composed of a +0.5 V common-mode component and a +1 V
differential component.
Table I. Make vs. Buy Error Budget
AD621 Circuit
Calculation
Discrete Circuit
Calculation
Error, ppm of Full Scale
AD621
Error Source
Discrete
ABSOLUTE ACCURACY at T
A
= +25
°
C
Input Offset Voltage,
μ
V
Output Offset Voltage,
μ
V
Input Offset Current, nA
CMR, dB
125
μ
V/20 mV
N/A
2 nA
×
350
/20 mV
110 dB
→
3.16 ppm,
×
5 V/20 mV
(150
μ
V
×
2
/20 mV
((150
μ
V
×
2)/100)/20 mV
(6 nA
×
350
)/20 mV
(0.02% Match
×
5 V)/20 mV
1
6,250
N/A
12,1
18
12,
791
15,000
12,
150
121,
53
1
4,988
Total Absolute Error
1
7,558
20,191
DRIFT TO +85
°
C
Gain Drift, ppm/
°
C
Input Offset Voltage Drift,
μ
V/
°
C
Output Offset Voltage Drift,
μ
V/
°
C
5 ppm
×
60
°
C
1
μ
V/
°
C
×
60
°
C/20 mV
N/A
100 ppm/
°
C Track
×
60
°
C
(2.5
μ
V/
°
C
×
2
×
60
°
C)/20 mV
(2.5
μ
V/
°
C
×
2
×
60
°
C)/100/20 mV
13,
300
1
3,000
N/A
12,
600
15,000
12,
150
Total Drift Error
1
3,690
15,750
RESOLUTION
Gain Nonlinearity, ppm of Full Scale
Typ 0.1 Hz–10 Hz Voltage Noise,
μ
V p-p 0.28
μ
V p-p/20 mV
40 ppm
40 ppm
(0.38
μ
V p-p
×
√
2
)120 mV
12,1
40
121,
14
12,1
40
12,1
27
Total Resolution Error
121,
54
121,
67
Grand Total Error
11,472
36,008
G = 100, V
S
=
±
15 V.
(All errors are min/max and referred to input.)
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