Analog DevicesEVAL-CN0272-SDPZ

The circuit  is a high speed photodiode signal conditioning circuit with dark current compensation. The system converts current from a high speed silicon PIN photodiode and drives the inputs of a 20 MSPS analog-to-digital converter (ADC). This combination of parts offers spectral sensitivity from 400 nm to 1050 nm with 49 nA of photocurrent sensitivity, a dynamic range of 91 dB, and a bandwidth of 2 MHz. The signal conditioning circuitry of the system consumes only 40 mA of current from the ±5 V supplies making this configuration suitable for portable high speed, high resolution light intensity applications, such as pulse oximetry.

• High speed photodiode signal conditioning circuit
• 91dB dynamic range and circuit consumes only 40 mA
• Dark current compensation
• Spectral range from 400 nm to 1050 nm
• Well suited for portable high speed applications

• Patient Monitoring
• Home Healthcare
• Electronic Test & Measurement
• Chemical Analysis

Circuit Note PDF, 04/2013 (pdf, 376 kB)