Single-Lead, Heart Rate Monitor Front End Data Sheet AD8232 Rev. 0打牌斗地主
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responsibility is assumed by Analog Devices for its u, nor for any infringements of patents or other rights of third parties that may result from its u. Specifications subject to change without notice. No licen is granted by implication or otherwi under any patent or patent rights of Analog Devices. T rademarks and registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 9106, N orwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 Fax: 781.461.3113 ©2012 Analog Devices, Inc. All rights rerved.
FEATURES
偶像的英文Fully integrated single-lead ECG front end
Low supply current: 170 µA (typical)
Common-mode rejection ratio: 80 dB (dc to 60 Hz) Two or three electrode configurations
High signal gain (G = 100) with dc blocking capabilities 2-pole adjustable high-pass filter
Accepts up to ±300 mV of half cell potential
跳远的动作要领Fast restore feature improves filter ttling Uncommitted op amp
3-pole adjustable low-pass filter with adjustable gain Leads off detection: ac or dc options
Integrated right leg drive (RLD) amplifier
Single-supply operation: 2.0 V to 3.5 V
Integrated reference buffer generates virtual ground Rail-to-rail output
Internal RFI filter
8 kV HBM ESD rating
Shutdown pin
20-lead 4 mm × 4 mm LFCSP package APPLICATIONS
Fitness and activity heart rate monitors
Portable ECG
Remote health monitors
Gaming peripherals
Biopotential signal acquisition FUNCTIONAL BLOCK DIAGRAM
Figure 1.创业工场
GENERAL DESCRIPTION
The AD8232 is an integrated signal conditioning block for ECG and other biopotential measurement applications. It is designed to extract, amplify, and filter small biopotential signals in the prence of noisy conditions, such as tho created by motion or remote electrode placement. This design allows for an ultralow power analog-to-digital converter (ADC) or an embedded microcontroller to acquire the output signal easily.
The AD8232 can implement a two-pole high-pass filter for eliminating motion artifacts and the electrode half-cell potential. This filter is tightly coupled with the instrumentation architec-ture of the a
mplifier to allow both large gain and high-pass filtering in a single stage, thereby saving space and cost.
An uncommitted operational amplifier enables the AD8232 to create a three-pole low-pass filter to remove additional noi. The ur can lect the frequency cutoff of all filters to suit different types of applications. To improve common-mode rejection of the line frequencies in the system and other undesired interferences, the AD8232 includes an amplifier for driven lead applications, such as right leg drive (RLD).
The AD8232 includes a fast restore function that reduces the duration of otherwi long ttling tails of the high-pass filters. After an abrupt signal change that rails the amplifier (such as a leads off condition), the AD8232 automatically adjusts to a higher filter cutoff. This feature allows the AD8232 to recover quickly, and therefore, to take valid measurements soon after connecting the electrodes to the subject.
The AD8232 is available in a 4 mm × 4 mm, 20-lead LFCSP package. Performance is specified from 0°C to 70°C and is operational from −40°C to +85°C.
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AD8232
Data Sheet
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TABLE OF CONTENTS
Features .............................................................................................. 1 Applications ....................................................................................... 1 Functional Block Diagram .............................................................. 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications ..................................................................................... 3 Absolute Maximum Ratings ............................................................ 6 ESD Caution .................................................................................. 6 Pin Configuration and Function Descriptions ............................. 7 Typical Performance Characteristics ............................................. 8 Instrumentation Amplifier Performance Curves ..................... 8 Operational Amplifier Performance Curves .......................... 11 Right Leg Drive (RLD) Amplifier Performance Curves ....... 14 Reference
Buffer Performance Curves .................................... 15 System Performance Curves ..................................................... 16 Theory of Operation ...................................................................... 17 Architecture Overview .............................................................. 17 Instrumentation Amplifier ........................................................ 17 Operational Amplifier ............................................................... 17 Right Leg Drive Amplifier ......................................................... 17 Reference Buffer ......................................................................... 18 Fast Restore Circuit .................................................................... 18 Leads Off Detection ................................................................... 19 Standby Operation ..................................................................... 19 Input Protection ......................................................................... 20 Radio Frequency Interference (RFI) ........................................ 20 Power Supply Regulation and Bypassing ................................ 20 Input Referred Offts ............................................................... 20 Layout Recommendations ........................................................ 20 Applications Information .............................................................. 21 Eliminating . 21 21 Low-Pass Filtering and Gain ...........................
.......................... 23 Driven Electrode ........................................................................ 23 Application Circuits ....................................................................... 24 Heart Rate Measurement Next to the Heart ........................... 24 Exerci Application: Heart Rate Measured at the Hands .... 24 Cardiac Monitor Configuration ............................................... 25 Portable Cardiac Monitor with Elimination of Motion
Artifacts ....................................................................................... 25 Packaging and Ordering Information ......................................... 27 Outline Dimensions ................................................................... 27 Ordering Guide .. (27)
REVISION HISTORY
8/12—Revision 0: Initial Version
Data Sheet
AD8232
Rev. 0 | Page 3 of 28
SPECIFICATIONS
V S = 3 V , V REF = 1.5 V , V CM = 1.5 V , T A = 25°C, FR=low, SDN=high, AC/DC = low, unless otherwi noted. Table 1.
Parameter
Symbol Test Conditions/Comments Min Typ Max Unit INSTRUMENTATION AMPLIFIER
Common-Mode Rejection Ratio, DC to 60 Hz CMRR V CM = 0.35 V to 2.85 V, V DIFF = 0 V 80 86 dB
V CM = 0.35 V to 2.85 V, V DIFF = ±0.3 V 80 dB Power Supply Rejection Ratio PSRR V S = 2.0 V to 3.5 V 76 90 dB Offt Voltage (RTI)
V OS
Instrumentation Amplifier Inputs
3 8 mV DC Blocking Input 1 5 50 µV Average Offt Drift
Instrumentation Amplifier Inputs 10 µV/°C DC Blocking Input 1 0.05 µV/°C Input Bias Current I B
50 200 pA
T A = 0°C to 70°C 1 nA Input Offt Current I OS
25 100 pA
西游记第七回读后感T A = 0°C to 70°C 1 nA Input Impedance
Differential 10||7.5 GΩ||pF Common Mode
5||15 GΩ||pF Input Voltage Noi (RTI)
Spectral Noi Density
f = 1 kHz
100 nV/√Hz Peak-to-Peak Voltage Noi f = 0.1 Hz to 10 Hz 12 µV p-p
f = 0.5 Hz to 40 Hz 14 µV p-p Input Voltage Range
T A = 0°C to 70°C 0.2 +V S V DC Differential Input Range V DIFF −300 +300 mV Output
第一单元作文
Output Swing
R L = 50 kΩ 0.1 +V S − 0.1 V Short-Circuit Current I OUT 6.3 mA Gain
A V
100 V/V Gain Error V DIFF = 0 V
0.4 %
V DIFF = −300 mV to +300 mV 1 3.5 %
Average Gain Drift T A = 0°C to 70°C 12 ppm/°C Bandwidth
BW 2 kHz RFI Filter Cutoff (Each Input) 1 MHz OPERATIONAL AMPLIFIER (A1) Offt Voltage V OS
1 5 mV Average TC T A = 0°C to 70°C 5 µV/°C Input Bias Current I B
100 pA
T A = 0°C to 70°C 1 nA Input Offt Current I OS
箴言是什么意思100 pA
T A = 0°C to 70°C 1
nA Input Voltage Range
0.1 +V S − 0.1 V Common-Mode Rejection Ratio CMRR V CM = 0.5 V to 2.5 V 100 dB Power Supply Rejection Ratio PSRR 100 dB Large Signal Voltage Gain A VO
110
dB Output Voltage Range R L = 50 kΩ 0.1 +V S − 0.1 V Short-Circuit Current Limit I OUT 12 mA Gain Bandwidth Product
GBP
水果拼图
100
kHz
AD8232 Data Sheet
Rev. 0 | Page 4 of 28
Data Sheet AD8232 Parameter Symbol Test Conditions/Comments Min Typ Max Unit Supply Range 2.0 3.5 V Specified Temperature Range 0 70 °C Operational Temperature Range −40 +85 °C
1 Offt referred to the input of the instrumentation amplifier inputs. See the Input Referred Offts ction for additional information.
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