AD8232
Data Sheet
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
15 FR
HPDRIVE
+IN
1
2
3
4
5
14 AC/DC
13 SDN
12 LOD+
11 LOD–
AD8232
–IN
TOP VIEW
RLDFB
RLD
NOTES
1. CONNECT THE EXPOSED PAD TO GND OR
LEAVE UNCONNECTED.
Figure 2. Pin Configuration
Table 3. Pin Function Descriptions
Pin No. Mnemonic Description
1
HPDRIVE
High-Pass Driver Output. Connect HPDRIVE to the capacitor in the first high-pass filter. The AD8232 drives this pin
to keep HPSENSE at the same level as the reference voltage.
2
3
4
5
6
7
8
+IN
−IN
RLDFB
RLD
SW
Instrumentation Amplifier Positive Input. +IN is typically connected to the left arm (LA) electrode.
Instrumentation Amplifier Negative Input. −IN is typically connected to the right arm (RA) electrode.
Right Leg Drive Feedback Input. RLDFB is the feedback terminal for the right leg drive circuit.
Right Leg Drive Output. Connect the driven electrode (typically, right leg) to the RLD pin.
Fast Restore Switch Terminal. Connect this terminal to the output of the second high-pass filter.
Operational Amplifier Noninverting Input.
OPAMP+
REFOUT
Reference Buffer Output. The instrumentation amplifier output is referenced to this potential. Use REFOUT as a
virtual ground for any point in the circuit that needs a signal reference.
9
10
OPAMP−
OUT
Operational Amplifier Inverting Input.
Operational Amplifier Output. The fully conditioned heart rate signal is present at this output. OUT can be
connected to the input of an ADC.
11
12
LOD−
LOD+
Leads Off Comparator Output. In dc leads off detection mode, LOD− is high when the electrode to −IN is
disconnected, and it is low when connected. In ac leads off detection mode, LOD− is always low.
Leads Off Comparator Output. In dc leads off detection mode, LOD+ is high when the +IN electrode is
disconnected, and it is low when connected. In ac leads off detection mode, LOD+ is high when either the −IN
or +IN electrode is disconnected, and it is low when both electrodes are connected.
13
14
SDN
Shutdown Control Input. Drive SDN low to enter the low power shutdown mode.
AC/DC
Leads Off Mode Control Input. Drive the AC/DC pin low for dc leads off mode. Drive the AC/DC pin high for ac leads
off mode.
15
16
17
18
19
20
FR
GND
+VS
REFIN
IAOUT
HPSENSE
Fast Restore Control Input. Drive FR high to enable fast recovery mode; otherwise, drive it low.
Power Supply Ground.
Power Supply Terminal.
Reference Buffer Input. Use REFIN, a high impedance input terminal, to set the level of the reference buffer.
Instrumentation Amplifier Output Terminal.
High-Pass Sense Input for Instrumentation Amplifier. Connect HPSENSE to the junction of R and C that sets the
corner frequency of the dc blocking circuit.
EP
Exposed Pad. Connect the exposed pad to GND or leave it unconnected.
Rev. A | Page 6 of 28
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