AFE4404YZPT, Устройство AFE, 3В — 5.25В питание, DSBGA-15

The AFE4404YZPT is an Analog Front-End for optical bio-sensing applications, such as heart-rate monitoring (HRM) and saturation of peripheral capillary oxygen (SpO2). The device supports three switching light-emitting diodes (LEDs) and a single photodiode. The current from the photodiode is converted into voltage by the transimpedance amplifier (TIA) and digitized using an analog-to-digital converter (ADC). The ADC code can be read out using an I?C interface. The AFE also has a fully integrated LED driver with a 6-bit current control. The device has a high dynamic range transmit and receive circuitry that helps with the sensing of very small signal levels.

• Transmitter — supports common anode LED configuration
• Transmitter — 100dB dynamic range
• Transmitter — 6-bit programmable LED current to 50mA (Extendable to 100 mA)
• Transmitter — Programmable LED on-time
• Transmitter — Simultaneous Support of 3 LEDs for Optimized SpO2, HRM or multi-wavelength HRM
• 24-bit Representation of the current input from a photodiode in twos complement format
• Receiver — Individual DC offset subtraction DAC at TIA input for each LED and ambient phase
• Receiver — Digital ambient subtraction at ADC output
• Receiver — 10 kR to 2 MR Programmable transimpedance gain
• Receiver — 100dB Dynamic range
• Receiver — Dynamic power-saving mode to reduce current to less than 200µA
• 10 to 1000SPS Pulse frequency
• Flexible pulse sequencing and timing control
• Flexible clock options — External 4 to 60MHz Input Clock, Internal 4MHz Oscillator

Полупроводники — МикросхемыСпециальные Функции

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