Welcome Here  Shenzhen Mingjiada Electronics Co., Ltd.

The AFE4432YCHR is an analogue front-end for optical biosensing applications such as heart rate monitoring (HRM) and peripheral capillary oxygen saturation (SpO2) measurements. The device supports up to four switching light-emitting diodes (LEDs) and three photodiodes (PDs.) The AFE has two LED drivers with 8-bit current control. The device features wide dynamic range transmit and receive circuits to help detect very small signal levels. Up to 12 signal phase sets can be defined, each containing a combination of LED and ambient phases. A low-noise detuning DAC at the receiver input is automatically controlled to eliminate DC from ambient and LED light. In each phase, the current generated by the PD is converted to voltage by the TIA, filtered, and then digitised using a general purpose ADC, the code of which can be stored in a 160 sample FIFO block. The FIFOs can be read using the SPI or I2C interface.

Features

- Supports signal acquisition of up to 12 phase sets

- Supports up to 4 LEDs and 3 PDs

- Flexible assignment of LEDs and PDs within each phase

- Simultaneous acquisition of signals from different sensors at different data rates

- Accurate, continuous PPG monitoring:

- Low current for continuous heart rate monitoring in wearable devices, typically 12μA at the receiver

- 115dB peak system SNR in the 0.5Hz - 10Hz band for highly accurate SpO2 measurements

- Transmitter:

- 8-bit programmable LED current from 25mA to 250mA.

- Mode that illuminates two LEDs in parallel with independent per-phase current controls

- Programmable per-phase LED on-time

- Simultaneous support for 4 LEDs for SpO2, multiwavelength HRM

- Support 4 LEDs at the same time for SpO2, multiwavelength HRM receivers:

- Supports 3 time-division multiplexed PD inputs

- 2 parallel receivers (2 sets of TIA/filters)

- Each TIA input has a separate ambient offset voltage cancellation DAC with 8-bit control of each phase, adjustable up to 255μA

- Each TIA input has a separate LED offset derating DAC with 9-bit phase control and 64μA range

- Digital ambient cancellation on ADC outputs

- Noise filter with programmable bandwidth

- Transimpedance gain: 3.7 kΩ to 1 MΩ

- Supports external clock or internal oscillator

- Option to acquire data in synchronisation with the system clock

- Automatic ambient, LED DC cancellation

- FIFO with 160 sample depth

- SPI™ interface/I2C interface

- 1.9mm × 1.8mm DSBGA package, 0.35mm pitch

- Power: Receive: 1.7V - 1.9V, Transmit: 3V - 5.5V

Applications

- Optical heart rate monitoring (HRM) for wearables and ear-worn devices

- Heart rate variability (HRV) analysis

- Blood oxygen saturation (SpO2) measurement

• 1.Is the inventory and price seen on the platform accurate?

  A: all online goods on the shelves can be ordered online, but considering the large liquidity of spot inventory, it is not possible to achieve 100% accuracy at present. In case of any abnormality, you can contact our company online and give the corresponding solution.

• 2.Are all our products genuine?

  A: our self-supporting products are from cooperative domestic and foreign original factories or authorized agents, and the source can be traced to ensure the original and authentic products.

• 3.Can you provide the qualification certificate of the original factory or agent?

  A: at present, our self-employed brands TI，ST，ADI，NXP，LATTICE，CYPRESS，INFINEON，XILINX and other first-line brands. Other channels are the original factory and agency channels. If necessary, we can communicate and confirm according to the specific brand and model.

• 4.Can I make an inquiry through the company's website?

  A: You can inquire through the website, or by phone and email.

• 5.When can I deliver the goods after placing an order? How long will it take to get there?

  A: the delivery date is marked in most commodity information. You can estimate the delivery time of the commodity according to the delivery date. The specific arrival time depends on the warehouse where the commodity is located and the logistics mode you choose.

• 6.Can the company issue an invoice?

  A: you can issue ordinary invoices for individual users or special VAT invoices for enterprise users.