Datasheet AD8232 (Analog Devices) - 25
| Manufacturer | Analog Devices |
| Description | Single-Lead, Heart Rate Monitor Front End |
| Pages / Page | 32 / 25 — Data Sheet. AD8232. Table 4. Comparison of High-Pass Filtering Options. … |
| Revision | D |
| File Format / Size | PDF / 686 Kb |
| Document Language | English |
Data Sheet. AD8232. Table 4. Comparison of High-Pass Filtering Options. Filter. Component. Low Frequency. Capacitor. Output. Order. Count
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Data Sheet AD8232
Careful analysis and adjustment of all of the component values The design of the high-pass filter involves tradeoffs between signal in practice is recommended to optimize the filter characteristics. distortion, component count, low frequency rejection, and A useful hint is to reduce the value of RCOMP to increase the peaking component sizes. For example, a single-pole high-pass filter of the active filter to overcome the additional rol off results in the least distortion to the signal, but its rejection of introduced by the ac coupling network. Proper adjustment can low-frequency artifacts is the lowest yield the best pass-band flatness. Table 4 compares the recommended filtering options.
Table 4. Comparison of High-Pass Filtering Options Filter Component Low Frequency Capacitor Output Order Count Rejection Sizes/Values Signal Distortion1 Impedance2
Figure 53 1 2 Good Large Low Low Figure 55 2 4 Better Large Medium Higher Figure 56 2 5 Better Smaller Medium Low Figure 57 3 7 Best Smaller Highest Higher 1 For equivalent corner frequency location. 2 Output impedance refers to the drive capability of the high-pass filter before the low-pass filter. Low output impedance is desirable to allow flexibility in the selection of values for a low-pass filter, as explained in the Low-Pass Filtering and Gain section. Rev. D | Page 25 of 32 Document Outline Features Applications Functional Block Diagram General Description Revision History Specifications Absolute Maximum Ratings ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics Instrumentation Amplifier Performance Curves Operational Amplifier Performance Curves Right Leg Drive (RLD) Amplifier Performance Curves Reference Buffer Performance Curves System Performance Curves Theory of Operation Architecture Overview Instrumentation Amplifier Operational Amplifier Right Leg Drive Amplifier Reference Buffer Fast Restore Circuit Leads Off Detection DC Leads Off Detection AC Leads Off Detection Standby Operation Input Protection Radio Frequency Interference (RFI) Power Supply Regulation and Bypassing Input Referred Offsets Layout Recommendations Applications Information Eliminating Electrode Offsets High-Pass Filtering Two-Pole High-Pass Filter Additional High-Pass Filtering Options Low-Pass Filtering and Gain Driving Analog-to-Digital Converters Driven Electrode Application Circuits Heart Rate Measurement Next to the Heart Exercise Application: Heart Rate Measured at the Hands Cardiac Monitor Configuration Portable Cardiac Monitor with Elimination of Motion Artifacts Packaging and Ordering Information Outline Dimensions Ordering Guide
Data Sheet AD8232
Careful analysis and adjustment of all of the component values The design of the high-pass filter involves tradeoffs between signal in practice is recommended to optimize the filter characteristics. distortion, component count, low frequency rejection, and A useful hint is to reduce the value of RCOMP to increase the peaking component sizes. For example, a single-pole high-pass filter of the active filter to overcome the additional rol off results in the least distortion to the signal, but its rejection of introduced by the ac coupling network. Proper adjustment can low-frequency artifacts is the lowest yield the best pass-band flatness. Table 4 compares the recommended filtering options.
Table 4. Comparison of High-Pass Filtering Options Filter Component Low Frequency Capacitor Output Order Count Rejection Sizes/Values Signal Distortion1 Impedance2
Figure 53 1 2 Good Large Low Low Figure 55 2 4 Better Large Medium Higher Figure 56 2 5 Better Smaller Medium Low Figure 57 3 7 Best Smaller Highest Higher 1 For equivalent corner frequency location. 2 Output impedance refers to the drive capability of the high-pass filter before the low-pass filter. Low output impedance is desirable to allow flexibility in the selection of values for a low-pass filter, as explained in the Low-Pass Filtering and Gain section. Rev. D | Page 25 of 32 Document Outline Features Applications Functional Block Diagram General Description Revision History Specifications Absolute Maximum Ratings ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics Instrumentation Amplifier Performance Curves Operational Amplifier Performance Curves Right Leg Drive (RLD) Amplifier Performance Curves Reference Buffer Performance Curves System Performance Curves Theory of Operation Architecture Overview Instrumentation Amplifier Operational Amplifier Right Leg Drive Amplifier Reference Buffer Fast Restore Circuit Leads Off Detection DC Leads Off Detection AC Leads Off Detection Standby Operation Input Protection Radio Frequency Interference (RFI) Power Supply Regulation and Bypassing Input Referred Offsets Layout Recommendations Applications Information Eliminating Electrode Offsets High-Pass Filtering Two-Pole High-Pass Filter Additional High-Pass Filtering Options Low-Pass Filtering and Gain Driving Analog-to-Digital Converters Driven Electrode Application Circuits Heart Rate Measurement Next to the Heart Exercise Application: Heart Rate Measured at the Hands Cardiac Monitor Configuration Portable Cardiac Monitor with Elimination of Motion Artifacts Packaging and Ordering Information Outline Dimensions Ordering Guide
