參數(shù)資料
型號(hào)： EVAL-INAMP-62RZ
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 7/21頁(yè)
文件大?。?/td> 0K
描述： BOARD EVAL FOR AD620 SOIC
標(biāo)準(zhǔn)包裝： 1
每 IC 通道數(shù)： 1 - 單
放大器類型： 儀表
板類型： 部分填充
已供物品： 板，IC 樣品
已用 IC / 零件： 8-DIP，8-SOIC 封裝
AD620
Rev. H | Page 14 of 20
3k
Ω
5V
DIGITAL
DATA
OUTPUT
ADC
REF
IN
AGND
20k
Ω
10k
Ω
20k
Ω
AD620B
G = 100
1.7mA
0.10mA
0.6mA
MAX
499
Ω
3k
Ω
3k
Ω
3k
Ω
2
1
8
3
7
6
5
4
1.3mA
MAX
AD705
00775-0-042
Figure 38. 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 38 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 also serves applications such as diagnostic
noninvasive blood pressure measurement.
Medical ECG
The low current noise of the AD620 allows its use in ECG
monitors (Figure 39) 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
Ω
24.9k
Ω
24.9k
Ω
AD705J
G = 143
C1
1M
Ω
R4
10k
Ω
R1
R3
R2
OUTPUT
AMPLIFIER
PATIENT/CIRCUIT
PROTECTION/ISOLATION
00775-0-043
Figure 39. A Medical ECG Monitor Circuit
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