AD8232ACPZ-R7

Analog Devices

-40℃~+85℃ 12ppm/℃ 170uA 2V~3.5V LFCSP-20(4x4) Analog Front End (AFE) ROHS

Extended

Datasheetadi/AD8232ACPZ-R7

Category: Analog To Digital Converters (ADC)
Package: LFCSP-20(4x4)
Pins: 21

Overview

The AD8232ACPZ-R7 is an analog To Digital Converter made by Analog Devices in a LFCSP-20(4x4) package with 21 pins. -40℃~+85℃ 12ppm/℃ 170uA 2V~3.5V LFCSP-20(4x4) Analog Front End (AFE) ROHS.

PCBKit's library has its KiCad symbol (SparkFun-Sensors:AD8232, from Eagle libraries) and its footprint (SparkFun-Sensors:LFCSP_20, from Eagle libraries), ready for a KiCad board. 310 are in stock at JLCPCB (part C43216). 14 open-source boards in 13 repositories on GitHub use it.

Symbol

SparkFun-Sensors:AD8232From Eagle libraries

Footprint

SparkFun-Sensors:LFCSP_20From Eagle libraries

From the datasheet

Supply, least: 2 V · +VS, recommended operating min · p. 4
Supply, most: 3.5 V · +VS, recommended operating max · p. 4
Supply, absolute maximum: 3.6 V · +VS, absolute maximum · p. 5
Works from: -40 °C · operational temperature min · p. 4
Works up to: 85 °C · operational temperature max · p. 4
Junction, hottest: 140 °C · junction temperature max · p. 5
Takes working: 170 µA · +VS quiescent supply current typical · p. 4
Takes at most: 230 µA · +VS quiescent supply current max · p. 4
Takes asleep: 40 nA · +VS shutdown current typical · p. 4
Junction to air (LFCSP): 48 K/W · junction to ambient, free air on a 4-layer JEDEC board · p. 5
Junction to case (LFCSP): 4.4 K/W · junction to case · p. 5

What it is and has

Function: Fully integrated single-lead ECG front end · p. 1
Electrode configurations: Two or three electrodes · p. 1
Signal gain: 100, with dc blocking · p. 1
High-pass filter: 2-pole, adjustable · p. 1
Half cell potential: Up to ±300 mV · p. 1
Fast restore: Improves filter settling · p. 1
Operational amplifier: Uncommitted op amp · p. 1
Low-pass filter: 3-pole, adjustable, with adjustable gain · p. 1
Leads off detection: ac or dc options · p. 1
Right leg drive: Integrated RLD amplifier · p. 1
Reference buffer: Integrated virtual ground generation · p. 1
Output: Rail-to-rail · p. 1
RFI filter: Internal · p. 1
ESD rating: 8 kV HBM · p. 1
Shutdown: Shutdown pin · p. 1
Package: 20-lead 4 mm × 4 mm LFCSP · p. 1

Around it

cap 1 nF: between RLDFB and RLD; Starting value for the RLD integrator capacitor. · p. 17
res >330kΩ: between RLD and driven electrode; Example for a 3.0 V supply; limits electrode current below 10 uA, allowing component and supply variations. · p. 17
cap 0.1 μF: between +VS and GND; Place close to the supply pin for decoupling. · p. 20
cap 1 μF: between +VS and GND; Optional additional decoupling farther from the part; may be shared with other integrated circuits. · p. 20

Specifications

Parameter	Conditions	As printed	Page
Output Swing	RIGHT LEG DRIVE AMPLIFIER (A2); RL = 50 kΩ; upper limit +VS − 0.1 V	min 0.1 V	4
Short-Circuit Current IOUT	RIGHT LEG DRIVE AMPLIFIER (A2)	typ 11 mA	4
Integrator Input Resistor	RIGHT LEG DRIVE AMPLIFIER (A2)	min 120 · typ 150 · max 180 kΩ	4
Gain Bandwidth Product GDP	RIGHT LEG DRIVE AMPLIFIER (A2)	typ 100 kHz	4
Offset Error VOS	REFERENCE BUFFER (A3); RL > 50 kΩ	typ 1 mV	4
Input Bias Current IB	REFERENCE BUFFER (A3)	typ 100 pA	4
Short-Circuit Current Limit IOUT	REFERENCE BUFFER (A3)	typ 12 mA	4
Voltage Range	REFERENCE BUFFER (A3); RL = 50 kΩ; upper limit +VS − 0.7 V	min 0.1 V	4
Hysteresis	DC LEADS OFF COMPARATORS	typ 60 mV	4
Propagation Delay	DC LEADS OFF COMPARATORS	typ 0.5 us	4
Square Wave Frequency FAC	AC LEADS OFF DETECTOR	min 50 · typ 100 · max 175 kHz	4
Square Wave Amplitude IAC	AC LEADS OFF DETECTOR	typ 200 nA p-p	4
Impedance Threshold	AC LEADS OFF DETECTOR; Between +IN and −IN	min 10 · typ 20 MΩ	4
Detection Delay	AC LEADS OFF DETECTOR	typ 110 us	4
On Resistance RON	FAST RESTORE CIRCUIT; Switches S1 and S2	min 8 · typ 10 · max 12 kΩ	4
Off Leakage	FAST RESTORE CIRCUIT; Switches S1 and S2	typ 100 pA	4
Threshold Voltage	FAST RESTORE CIRCUIT; Window Comparator; From either rail	typ 50 mV	4
Propagation Delay	FAST RESTORE CIRCUIT; Window Comparator	typ 2 us	4
Feedback Recovery Switch On Time tSW1	FAST RESTORE CIRCUIT; Switch Timing Characteristics	typ 110 ms	4
Filter Recovery Switch On Time tSW2	FAST RESTORE CIRCUIT; Switch Timing Characteristics	typ 55 ms	4
Fast Restore Reset tRST	FAST RESTORE CIRCUIT; Switch Timing Characteristics	typ 2 us	4
Low VIL	LOGIC INTERFACE; Input Voltage (AC/DC and FR)	typ 1.24 V	4
High VIH	LOGIC INTERFACE; Input Voltage (AC/DC and FR)	typ 1.35 V	4
Low VIL	LOGIC INTERFACE; Input Voltage (SDN)	typ 2.1 V	4
High VIH	LOGIC INTERFACE; Input Voltage (SDN)	typ 0.5 V	4
Low VOL	LOGIC INTERFACE; Output Voltage; LOD+ and LOD− terminals	typ 0.05 V	4
High VOH	LOGIC INTERFACE; Output Voltage; LOD+ and LOD− terminals	typ 2.95 V	4
Quiescent Supply Current	SYSTEM SPECIFICATIONS	typ 170 · max 230 uA	4
Quiescent Supply Current	SYSTEM SPECIFICATIONS; TA = 0°C to 70°C	typ 210 uA	4
Shutdown Current	SYSTEM SPECIFICATIONS	typ 40 · max 500 nA	4
Shutdown Current	SYSTEM SPECIFICATIONS; TA = 0°C to 70°C	typ 100 nA	4
Supply Range	SYSTEM SPECIFICATIONS	min 2 · max 3.5 V	4
Specified Temperature Range	SYSTEM SPECIFICATIONS	min 0 · max 70 °C	4
Operational Temperature Range	SYSTEM SPECIFICATIONS	min -40 · max 85 °C	4
Supply Voltage		max 3.6 V	5
Minimum Voltage, Any Terminal		min -0.3 V	5
Storage Temperature Range		min -65 · max 125 °C	5
Operating Temperature Range		min -40 · max 85 °C	5
Maximum Junction Temperature		max 140 °C	5
θJA Thermal Impedance θJA	Device in free air on a 4-layer JEDEC board	max 48 °C/W	5
θJC Thermal Impedance θJC		max 4.4 °C/W	5
Human Body Model (HBM)	ESD Rating	max 8 kV	5
Charged Device Model (FICDM)	ESD Rating	max 1.25 kV	5
Machine Model (MM)	ESD Rating	max 200 V	5

Pins, by the datasheet

1 HPDRIVE: High-pass driver output; connect to the first high-pass filter capacitor to keep HPSENSE at the reference voltage. · p. 6
2 +IN: Instrumentation amplifier positive input, typically connected to the left arm electrode. · p. 6
3 −IN: Instrumentation amplifier negative input, typically connected to the right arm electrode. · p. 6
4 RLDFB: Right leg drive feedback input. · p. 6
5 RLD: Right leg drive output; connect to the driven electrode, typically the right leg. · p. 6
6 SW: Fast restore switch terminal; connect to the output of the second high-pass filter. · p. 6
7 OPAMP+: Operational amplifier noninverting input. · p. 6
8 REFOUT: Reference buffer output; use as virtual ground for circuit points needing a signal reference. · p. 6
9 OPAMP−: Operational amplifier inverting input. · p. 6
10 OUT: Operational amplifier output carrying the fully conditioned heart rate signal; may connect to an ADC input. · p. 6
11 LOD−: In dc mode, high when the −IN electrode is disconnected; low when connected and always low in ac mode. · p. 6
12 LOD+: In dc mode, high when the +IN electrode is disconnected; in ac mode, high when either input electrode is disconnected. · p. 6
13 SDN: Shutdown control; drive low to enter low power shutdown mode. · p. 6
14 AC/DC: Leads off mode control; low selects dc mode and high selects ac mode. · p. 6
15 FR: Fast restore control; drive high to enable fast recovery mode, otherwise drive low. · p. 6
16 GND: Power supply ground. · p. 6
17 +VS: Power supply terminal. · p. 6
18 REFIN: High impedance reference buffer input that sets the reference buffer level. · p. 6
19 IAOUT: Instrumentation amplifier output terminal. · p. 6
20 HPSENSE: High-pass sense input; connect to the R and C junction setting the dc blocking corner frequency. · p. 6
EP EP: Exposed pad; connect to GND or leave unconnected. · p. 6

Parameters

Current - Supply: 170uA
Current - Supply(Max): 230uA
Features: Fault detection
Junction Temperature(Max): 140℃
Operating Temperature: -40℃~+85℃
Quiescent Current (Iq): 170uA
Standby Current: 40nA
Thermal Resistance(Junction to Ambient): 48℃/W
Thermal Resistance(Junction to Case): 4.4℃/W
Voltage - Supply: 2V~3.5V
Voltage - Supply(Absolute Max): 3.6V

Order codes

AD8232ACPZ-R7LCSC C43216

Pinout

The pins of the AD8232ACPZ-R7
Pin	Name	Type
1	HPDRIVE	Unspecified
2	+IN	Unspecified
3	-IN	Unspecified
4	RLDFB	Unspecified
5	RLD	Unspecified
6	SW	Unspecified
7	OPAMP+	Unspecified
8	REFOUT	Unspecified
9	OPAMP-	Unspecified
10	OUT	Unspecified
11	LO-	Unspecified
12	LO+	Unspecified
13	SDN	Unspecified
14	AC/DC	Unspecified
15	FR	Unspecified
16	GND	Unspecified
17	+VS	Unspecified
18	REFIN	Unspecified
19	IAOUT	Unspecified
20	HPSENSE	Unspecified
PAD	GND_PAD	Unspecified

Open-source boards using it

All 14

2 layers220 × 50 mm
NeuroVox v2.0
Swapnil007-Curious/NeuroVox-v2.0
NeuroVox v2.0 is a conformal 220×50mm forearm wearable PCB. Powered by an ESP32-S3, it captures high-res 4-channel EMG via AD8232, INA333, and ADS1299 ICs using leadless, integrated dry Ag/AgCl edge electrodes.
94 parts3
2 layers17.5 × 24.7 mm
My template
nwasr/Stamp-Board-of-AD8232
Compact AD8232 stamp board designed in KiCad v9 with schematic, PCB layout, Gerbers, BOM, and 3D view.
23 parts2MIT
2 layers26 × 40 mm
Nervous ECG
sensors-inl/Nervous-ECG
ECAD design files, firmware source code and standalone application for the ECG sensor of the Nervous project.
65 parts2MIT
4 layers37.5 × 29.5 mm
HM Collector Rev2
konstantinosfragkoulis/HealthMonitor
Chest-worn STM32U5 sensor that records ECG and SCG, and computes HRV on-device. Bare metal C.
91 parts1MIT
2 layers27.9 × 37.6 mm
My template
nwasr/SparkFun-AD8232-Replica
KiCad v9 PCB design replicating the SparkFun AD8232 ECG module
36 parts1MIT
2 layers70 × 57 mm
Test PCB
abbyfinka/FYP-Knitted-EMG
This repository contains the software and hardware design files developed for my Final Year Project at Imperial College London
56 parts
4 layers99.5 × 56.5 mm
EKG licenta
AlexMirt2/EKG-signal-acquisition-and-processing-system
The diploma project focuses on designing and implementing an ECG signal acquisition and processing system. It includes smart devices capable of transmitting data to the cloud.
107 parts
2 layers25 × 54 mm
Ecg
anemoijereja-eden/ecg
Project for an esp32-based biosignal reader and processor
45 parts

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Questions

Is there a KiCad symbol and footprint for the AD8232ACPZ-R7?

Yes. The symbol is SparkFun-Sensors:AD8232 and the footprint SparkFun-Sensors:LFCSP_20, both drawn on this page. PCBKit places them on a board for you when you design with it.

What package is the AD8232ACPZ-R7?

LFCSP-20(4x4), with 21 pins. Its footprint is drawn on this page.

Where is the AD8232ACPZ-R7 datasheet?

Analog Devices publishes it: the Datasheet link on this page opens it.

Where can I order the AD8232ACPZ-R7?

JLCPCB lists it as part C43216, with 310 in stock; the sellers' links on this page open their listings.

Which open-source boards use the AD8232ACPZ-R7?

14 boards in 13 repositories on GitHub; the most starred are listed on this page, with their KiCad files.