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AFE4420YZT +BOM

Ultra-small integrated AFE with FIFO for multisensor wearable optical heart-rate monitoring

Hersteller:

Texas Instruments, Inc
Herstellerteil #:

AFE4420YZT
Datenblatt:

AFE4420YZT Datenblatt (PDF)
Number Of Bits:

24
Number Of Channels:

4
Mounting Type:

Surface Mount
Base Product Number:

AFE4420
EDA/CAD Modelle:

Fordern Sie kostenlose CAD-Modelle für an AFE4420YZT

AFE4420YZT Allgemeine Beschreibung

For optical bio-sensing applications such as heart-rate monitoring (HRM) and peripheral capillary oxygen saturation (SpO2), the AFE4420YZT offers a comprehensive analog front-end solution. With the ability to support multiple LEDs and photodiodes, as well as synchronized signal acquisition and storage in a FIFO block, the AFE4420 is well-equipped for capturing and processing data with precision. Its high dynamic range transmit-and-receive circuitry further enhances its performance in capturing very small signal levels. This makes the AFE4420 a versatile and reliable choice for a wide range of optical bio-sensing applications

Hauptmerkmale

Supports signal acquisition of up to 16 phases
Flexible allocation of LEDs and PDs in each phase
Accurate, continuous heart-rate monitoring:
- Up to 100-dB dynamic range
- Low current for continuous operation on a wearable device with a typical value
  - 15 µA for an LED, 20 µA for the receiver
Transmitter:
- Supports common anode LED configuration
- 8-Bit programmable LED current with range adjustable from 50 mA to 200 mA
- Mode to fire two LEDs in parallel
- Programmable LED on-time
- Simultaneous support of 4 LEDs for optimized SpO2, HRM, or multi-wavelength HRM
- Programmable control signals to extend operation to 8 LEDs using external SPDT switches
Receiver:
- Supports 4 time-multiplexed photodiode inputs
- Individual DC offset subtraction DAC at TIA input for each LED, ambient with 7-bit control and range up to ±254 µA
- Transimpedance gain: 10 kΩ to 2 MΩ
- Digital ambient subtraction at ADC output to suppress ambient tones
- Noise filtering with programmable bandwidth
Supports external clock and internal oscillator modes
Automatic ambient cancellation mode (AACM) to increase receiver dynamic range
Two programmable GPIO pins with flexible interrupt generation
FIFO with 128-sample depth
I²C, SPI interfaces: selectable by pin
Operating temperature range: –40°C to +85°C
2.6-mm × 2.1-mm DSBGA, 0.4-mm pitch
Supplies:
- Rx:
  - 1.7 V to 1.9 V (LDO bypass)
  - 1.9 V to 3.6 V (LDO enabled)
- Tx: 3 V to 5.5 V
- IO: 1.7 V to RX_SUP

Spezifikationen

Category	Integrated Circuits (ICs)Data AcquisitionAnalog Front End (AFE)	Series	-
Number of Bits	24	Number of Channels	4
Voltage - Supply, Analog	-	Voltage - Supply, Digital	-
Mounting Type	Surface Mount	Base Product Number	AFE4420
Applications	Optical-HRM	Number of input channels	4
Resolution (Bits)	22	Number of LEDs	4
Interface type	I2C	Operating temperature range (°C)	-40 to 85
Rating	Catalog	feature-resolution
feature-maximum-single-supply-voltage-v		feature-minimum-dual-supply-voltage-v
feature-maximum-dual-supply-voltage-v		feature-power-supply-type
feature-packaging	Tape and Reel	feature-minimum-single-supply-voltage-v
feature-rad-hard		feature-pin-count	30
feature-cecc-qualified		feature-esd-protection
feature-escc-qualified		feature-military	No
feature-aec-qualified	No	feature-aec-qualified-number
feature-auto-motive	No	feature-p-pap	No
feature-eccn-code	EAR99	feature-svhc
feature-svhc-exceeds-threshold	No

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