參數(shù)資料
型號: AD8420ARMZ-RL
廠商: Analog Devices Inc
文件頁數(shù): 17/28頁
文件大?。?/td> 0K
描述: IC AMP INSTR RR 2.5KHZ 8MSOP
標準包裝: 3,000
放大器類型: 儀表
電路數(shù): 1
輸出類型: 滿擺幅
轉換速率: 1 V/µs
-3db帶寬: 250kHz
電流 - 輸入偏壓: 20nA
電壓 - 輸入偏移: 250µV
電流 - 電源: 85µA
電流 - 輸出 / 通道: 10mA
電壓 - 電源,單路/雙路(±): 2.7 V ~ 36 V,±2.7 V ~ 18 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 8-TSSOP,8-MSOP(0.118",3.00mm 寬)
供應商設備封裝: 8-MSOP
包裝: 帶卷 (TR)
AD8420
Data Sheet
Rev. 0 | Page 24 of 28
APPLICATIONS INFORMATION
AD8420 IN ELECTROCARDIOGRAPHY (ECG)
A high-pass filter is commonly used in ECG signal conditioning
circuitry to remove electrode offset and motion artifacts. To avoid
degrading the input impedance and CMRR of the system, this
filtering is typically implemented after the instrumentation
amplifier, which limits the gain that can be applied with the
instrumentation amplifier.
With a 3-op-amp instrumentation amplifier, gain is applied in the
first stage. Because of this, the electrode offset is gained and then
must be removed afterward with a high-pass filter. In the AD8420
architecture, the offset can be accounted for in the input stage
by unbalancing the transconductance amplifier at the REF and
FB pins. In the steady state, the offset at the input is not gained
to the output, and higher frequency signals can be gained and
passed through. Using the AD8420 in this way, the offset tolerance
is nearly the differential input range of the part (±1 V).
Figure 69 shows an ECG front end that applies a gain of 100 to
the signal while rejecting dc and high frequencies. This circuit
combines the AD8420 with the AD8657, which is a low power,
low cost, dual, precision CMOS op amp.
–5V
8200pF
10M
INSTRUMENTATION
AMPLIFIER
G = +100
AD8420
+5V
–5V
+5V
3.3μF
AB
C
09
94
5
-07
2
402k
200pF
2000pF
100k
+5V
–5V
AD8657-2
AD8657-1
REF
FB
100k
1k
200k
0.015μF
THREE-POLE LPF,
BESSEL RESPONSE
FC = 50Hz
INTEGRATOR PROVIDES
HIGH-PASS POLE AT 0.5Hz
110k
0.022μF
500k
Figure 69. AD8420 in an ECG Front End
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