Datasheet > AD8233

AD8233

更新时间： 2022-02-26 13:51:54

品牌	Logo	应用领域
亚德诺 - ADI		/
页数	文件大小	规格书
30页	772K
描述
Fitness and activity heart rate monitors

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数据手册

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AD8233 数据手册

Data Sheet

AD8233

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

BALL A1

AD8233

INDICATOR

GND

REFIN HPSENSE HPDRIVE

SDN

AC/DC

IAOUT

+IN

LOD RLD SDN REFOUT RLDFB

–IN

OUT

OPAMP– OPAMP+

RLD

TOP VIEW

(BALL SIDE DOWN)

Not to Scale

Figure 2. Pin Configuration

Table 5. Pin Function Descriptions

Pin No. Mnemonic Description

GND

+V_S

REFIN

HPSENSE

Power Supply Ground.

Power Supply Terminal.

Reference Buffer Input. Use REFIN, a high impedance input terminal, to set the level of the reference buffer.

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.

HPDRIVE

High-Pass Driver Output. Connect HPDRIVE to the capacitor in the first high-pass filter. The AD8233 drives this pin

to keep HPSENSE at the same level as the reference voltage.

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.

IAOUT

+IN

LOD

RLD SDN

REFOUT

Fast Restore Control Input. Drive FR high to enable fast recovery mode; otherwise, drive it low.

Instrumentation Amplifier Output Terminal.

Instrumentation Amplifier, Positive Input. +IN is typically connected to the left arm (LA) electrode.

Leads Off Detection (LOD) Comparator Output.

Right Leg Drive Shutdown Control Input. Drive RLD SDN low to power down the RLD amplifier.

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 requires a signal reference.

RLDFB

−IN

OUT

Right Leg Drive Feedback Input. RLDFB is the feedback terminal for the right leg drive circuit.

Instrumentation Amplifier, Negative Input. −IN is typically connected to the right arm (RA) electrode.

Operational Amplifier Output. The fully conditioned heart rate signal is present at this output. OUT can be

connected to the input of an ADC.

OPAMP−

OPAMP+

Operational Amplifier Inverting Input.

Operational Amplifier Noninverting Input.

Fast Restore Switch Terminal. Connect this terminal to the output of the second high-pass filter.

Right Leg Drive Output. Connect the driven electrode (typically, right leg) to the RLD pin.

RLD

Rev. 0 | Page 7 of 29

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