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AD620AR-REEL Datasheet(PDF) 15 Page - Analog Devices

Part # AD620AR-REEL
Description  Low Cost Low Power Instrumentation Amplifier
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD620AR-REEL Datasheet(HTML) 15 Page - Analog Devices

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AD620
Rev. G | Page 15 of 20
3k
5V
DIGITAL
DATA
OUTPUT
ADC
REF
IN
AGND
20k
10k
20k
AD620B
G = 100
1.7mA
0.10mA
0.6mA
MAX
499
3k
3k
3k
2
1
8
3
7
6
5
4
1.3mA
MAX
AD705
Figure 40. A Pressure Monitor Circuit that Operates on a 5 V Single Supply
Pressure Measurement
Although useful in many bridge applications, such as weigh
scales, the AD620 is especially suitable for higher resistance
pressure sensors powered at lower voltages where small size and
low power become more significant.
Figure 40 shows a 3 kΩ pressure transducer bridge powered
from 5 V. In such a circuit, the bridge consumes only 1.7 mA.
Adding the AD620 and a buffered voltage divider allows the
signal to be conditioned for only 3.8 mA of total supply current.
Small size and low cost make the AD620 especially attractive for
voltage output pressure transducers. Since it delivers low noise
and drift, it will also serve applications such as diagnostic
noninvasive blood pressure measurement.
Medical ECG
The low current noise of the AD620 allows its use in ECG
monitors (Figure 41) where high source resistances of 1 MΩ or
higher are not uncommon. The AD620’s low power, low supply
voltage requirements, and space-saving 8-lead mini-DIP and
SOIC package offerings make it an excellent choice for battery-
powered data recorders.
Furthermore, the low bias currents and low current noise,
coupled with the low voltage noise of the AD620, improve the
dynamic range for better performance.
The value of capacitor C1 is chosen to maintain stability of
the right leg drive loop. Proper safeguards, such as isolation,
must be added to this circuit to protect the patient from
possible harm.
G = 7
AD620A
0.03Hz
HIGH-
PASS
FILTER
OUTPUT
1V/mV
+3V
–3V
RG
8.25k
24.9k
24.9k
AD705J
G = 143
C1
1M
R4
10k
R1
R3
R2
OUTPUT
AMPLIFIER
PATIENT/CIRCUIT
PROTECTION/ISOLATION
Figure 41. A Medical ECG Monitor Circuit


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