13 FN6339.4 July 26, 2011 ECG AMPLIFIER ECG amplifiers must extract millivolt low frequency AC signals from the skin of the " />
參數(shù)資料
型號(hào)： ISL28488FVZ-T7
廠商： Intersil
文件頁(yè)數(shù)： 5/20頁(yè)
文件大?。?/td> 0K
描述： IC OP AMP QUAD RRIO 14-TSSOP
產(chǎn)品培訓(xùn)模塊： Solutions for Industrial Control Applications
標(biāo)準(zhǔn)包裝： 1,000
放大器類型： 通用
電路數(shù)： 4
輸出類型： 滿擺幅
轉(zhuǎn)換速率： 0.14 V/µs
增益帶寬積： 300kHz
電流 - 輸入偏壓： 10pA
電壓 - 輸入偏移： 50µV
電流 - 電源： 240µA
電流 - 輸出 / 通道： 31mA
電壓 - 電源，單路/雙路(±)： 2.4 V ~ 5.5 V，±1.2 V ~ 2.75 V
工作溫度： -40°C ~ 125°C
安裝類型： 表面貼裝
封裝/外殼： 14-TSSOP（0.173"，4.40mm 寬）
供應(yīng)商設(shè)備封裝： 14-TSSOP
包裝： 帶卷 (TR)
ISL28288, ISL28488
13
FN6339.4
July 26, 2011
ECG AMPLIFIER
ECG amplifiers must extract millivolt low frequency AC signals
from the skin of the patient while rejecting AC common mode
interference and static DC potentials created at the electrode-to-
skin interface. In Figure 40, the ISL28288 (U1) forms one of the
multiple high gain AC band-pass amplifiers using active
feedback. Amplifier U1B and RC RF1, CF1 form a high gain LP
filtered amplifier with the corner frequency given by Equation 3:
Inserting the low pass amplifier, U1B, in U1A’s feedback loop
results in an overall high-pass frequency response. Voltage
divider pairs R1-R2 and R3-R4 set the overall amplifier pass-
band gain. The DC input offset is cancelled by U1B at U1A’s
inverting input. Resistor divider pair, R3-R4 define the maximum
input DC level that is cancelled, and is given by Equation 4:
In the passband range, U1B’s gain is +1 and the total signal gain
is defined by the divider ratios according to Equation 5:
At frequencies greater than the LPF corner, the R1-C1 and R3-C3
networks roll off U1A's gain to unity. Setting both R-C time
constants to the same value simplifies to Equation 6:
Right leg drive and reference amplifiers U2A and U2B form a DC
feedback loop that applies a correction voltage at the Right Leg
electrode to cancel out DC and low frequency body interference.
The voltage at the VCM sense electrode is maintained at the
reference voltage set by RF1-RF2.
With the values shown in Figure 40, the ECG circuit performance
parameters are:
1. Supply Voltage Range = +2.4V to +5.5V
2. Total Supply Current Draw @ +5V = 500A (typ)
3. Common-Mode Reference Voltage (VCM) = V+/2
4. Max DC Input Offset Voltage = VCM ±0.18V to ±0.41V
5. Passband Gain = 425V/V
6. Lower -3dB Frequency = 0.05Hz
7. Upper -3dB Frequency = 159Hz
-
+
5V
+
V+
V-
ISL28x88
10k
Ω
R3
10k
Ω
R2
R4
100k
Ω
R1
100k
Ω
410V/°C
FIGURE 39. THERMOCOUPLE AMPLIFIER
COLD JUNCTION
COMPENSATION
K TYPE
THERMOCOUPLE
f-HPF-3dB
1
2Pi
×
RF1
×
CF1
×
--------------------------------------------------
=
(EQ. 3)
VINDC
V+
R4
R3 R4
+
--------------------
×
=
(EQ. 4)
VOUTU1 GAIN
VOUT
VIN
-------------
R1 R2
+
R2
--------------------
R3 R4
+
R4
--------------------
×
=
(EQ. 5)
f-LPF-3dB
1
2Pi
×
R1
×
C1
×
-----------------------------------------
=
(EQ. 6)
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