参数资料
| 型号： | ISL28488FAZ |
| 厂商： | Intersil |
| 文件页数： | 5/20页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP QUAD RRIO MCPWR 16-QSOP |
| 标准包装： | 97 |
| 放大器类型： | 通用 |
| 电路数： | 4 |
| 输出类型： | 满摆幅 |
| 转换速率： | 0.14 V/µs |
| 增益带宽积： | 300kHz |
| 电流 - 输入偏压： | 10pA |
| 电压 - 输入偏移： | 50µV |
| 电流 - 电源： | 240µA |
| 电流 - 输出 / 通道： | 31mA |
| 电压 - 电源，单路/双路(±)： | 2.4 V ~ 5.5 V，±1.2 V ~ 2.75 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-QSOP |
| 包装： | 管件 |
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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| ISL28488FAZ-T7 | 功能描述:IC OPAMP QUAD RRIO MCPWR 16-QSOP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 其它有关文件:Automotive Product Guide 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1 系列:- 放大器类型:通用 电路数:1 输出类型:满摆幅 转换速率:3 V/µs 增益带宽积:10MHz -3db带宽:- 电流 - 输入偏压:1pA 电压 - 输入偏移:70µV 电流 - 电源:2.5mA 电流 - 输出 / 通道:48mA 电压 - 电源，单路/双路(±):2.7 V ~ 5.5 V，±1.35 V ~ 2.75 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:Digi-Reel® 其它名称:MAX4475AUT#TG16DKR |
| ISL28488FVZ | 功能描述:IC OP AMP QUAD RRIO 14-TSSOP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:75 系列:MicroAmplifier™ 放大器类型:通用 电路数:1 输出类型:满摆幅 转换速率:0.03 V/µs 增益带宽积:100kHz -3db带宽:- 电流 - 输入偏压:1pA 电压 - 输入偏移:60µV 电流 - 电源:20µA 电流 - 输出 / 通道:5mA 电压 - 电源，单路/双路(±):2.3 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商设备封装:8-SOIC 包装:管件 |
| ISL28488FVZ-T7 | 功能描述:IC OP AMP QUAD RRIO 14-TSSOP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 其它有关文件:TS1854A View All Specifications 标准包装:50 系列:- 放大器类型:通用 电路数:4 输出类型:满摆幅 转换速率:0.25 V/µs 增益带宽积:630kHz -3db带宽:- 电流 - 输入偏压:16nA 电压 - 输入偏移:1000µV 电流 - 电源:162µA 电流 - 输出 / 通道:48mA 电压 - 电源，单路/双路(±):1.8 V ~ 6 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:14-SOIC（0.154"，3.90mm 宽） 供应商设备封装:14-SO 包装:管件 |
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