AFE4410 Texas instruments

AFE4410

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AFE4410

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Описание

TheAFE4410is an analog front-end for optical biosensing applications, such as heart rate monitoring (HRM). The device supports a maximum of four switching light-emitting diodes (LEDs) and a maximum of three photodiodes (PDs). The electrical 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 is stored in a 128-sample first-in, first-out block (FIFO) with programmable depth. The FIFO can be read out using either an I2C interface or a serial peripheral interface (SPI). The AFE also has a fully integrated LED driver with 8-bit current control. The device has high dynamic range transmit-and-receive circuitry offering a dynamic range of up to 100 dB that enables accurate heart ratesensing. The AFE achieves extremely low current levels by operating an ultralow power (ULP) mode set by using the ENABLE_ULP register bit.

Accurate, Continuous Heart-Rate Monitoring:
- Up to 100-dB Dynamic Range for Accurate Heart-Rate Detection
- Low Current for Continuous Operation on a Wearable Device With a Typical Value:
  - 30 µA for an LED, 25 µA for the Receiver
Transmitter:
- 4 LEDs in Common Anode Configurations
- 8-Bit Programmable LED Current to 200 mA
- Mode to Fire Two LEDs in Parallel
- Programmable LED On-Time
- Simultaneous Support of 3 LEDs for Optimized SpO₂, HRM, or Multiwavelength HRM
- Average Current of 30 µA Adequate for a Typical Heart-Rate Monitoring Scenario:
  - 20-mA Setting, 60-µs Pulse Duration,
    25-Hz Sampling Rate
Receiver:
- Supports 3 Time-Multiplexed PD Inputs
- 24-Bit Representation of Current Input From PD in Two’s-Complement Format
- Individual DC Offset Subtraction DAC
  (Up to ±127-µA Range) at TIA Input for Each LED, Ambient
- Digital Ambient Subtraction at ADC Output
- Transimpedance Gain: 10 kΩ to 2 MΩ
- Noise Filtering With Programmable Bandwidth
- Receiver Operates at Approximately 1-µA/Hz Sampling Rate (Example, 25 µA at 25 Hz)
- Hardware Power-Down Mode: Approximately 0-µA Current
Flexible Pulse Sequencing and Timing Control
Clocking Via External Clock or Internal Oscillator
FIFO With 128-Sample Depth:
- Programmable Partitioning Across Phases
Pin-Selectable I²C, SPI Interface
Operating Temperature Range: –20°C to +70°C
2.6-mm × 2.1-mm, 0.4-mm Pitch DSBGA Package
Supplies:
- Tx: 3 V to 5.25 V
- Rx: 1.8 V to 1.9 V (LDO Bypass),
  2.0 V to 3.6 V (LDO Enabled)
- IO: 1.7 V to Rx_SUP

Applications	Optical-HRM
Number of input channels	3
Resolution (Bits)	22
Number of LEDs	4
Interface type	I2C, SPI
Operating temperature range (°C)	-20 to 70, 0 to 0
Rating	Catalog