ADPD2210ACPZ-R7

Overview

The ADPD2210ACPZ-R7 is an ultralow noise, low power current amplifier designed for wearable photoplethysmography applications. It amplifies sensor signal currents by a factor of 24 while adding minimal noise, enabling the use of smaller photodiodes with performance comparable to larger ones. The device operates on a single supply voltage ranging from 1.8 V to 5 V. Key electrical parameters include a typical supply current of 140 μA when active and 100 nA in standby mode. The nominal linear output current is 240 μA at 3.3 V, with a rise and fall time of 5 μs. The input-referred noise floor is typically 80 fA/√Hz, and the bandwidth ranges from 85 kHz to 125 kHz depending on input current. It is housed in a space-saving 2 mm × 2 mm LFCSP package.

Feature Summary

• Ultralow noise current amplifier optimized for small photodiode applications
• Integrated 24x current mirror gain with high linearity exceeding 60 dB
• Low power consumption with dedicated standby mode via power-down pin
• Near zero-bias operation holding input within ±5 mV of reference terminal

Applications

• Photoplethysmography (PPG)
• Wrist-worn heart rate monitoring (HRM)
• Finger-worn pulse oximeter oxygen saturation (SpO2)
• Small current pulsed amperometry
• Photodiode measurements requiring ultralow noise amplification

Procurement Notes

Verify component authenticity through authorized Analog Devices distributors or direct channels. Confirm RoHS compliance status as indicated in the ordering guide. Ensure proper handling of the exposed pad connection to ground during assembly to maintain thermal and electrical performance. Check datasheet revision A for updated specifications and ordering information before finalizing procurement.

Selection Notes

Select this component for designs prioritizing minimal power consumption and high signal-to-noise ratio in wearable health monitoring devices. The integrated gain reduces the need for external amplification stages, simplifying circuit layout. Consider the 1.8 V to 5 V supply range compatibility with standard battery-powered systems. Evaluate the 2 mm × 2 mm package size against available PCB real estate constraints.

Part Context

The ADPD2210 belongs to the Analog Devices family of optical sensors and signal conditioning ICs. It is specifically engineered to address the challenges of sensing small photocurrents in compact form factors. The device replaces traditional transimpedance amplifier configurations, offering improved electromagnetic interference immunity and reduced system complexity for clinical and consumer health applications.

Replacement Considerations

Public confirmed substitute part numbers are not provided in the source material.