AFE44S30YZR

Product Folder Order Now Support & Community Tools & Software Technical Documents AFE44S30 SBASA24 – DECEMBER 2019 AFE44S30 Ultra-Small, Integrated AFE With FIFO for Multi-Sensor Wearable, Optical Heart-Rate Monitoring and Bio-Sensing 1 Features 2 Applications • • • • • • • • • • • The AFE44S30 is an analog front-end for optical biosensing applications, such as heart-rate monitoring (HRM) and saturation of peripheral capillary oxygen (SpO2). The device supports up to eight switching light-emitting diodes (LEDs) and up to four photodiodes. Up to 24 signal phases can be defined and the signal can be acquired from each phase in a synchronized manner. 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 stored in a 128-sample First in, First out (FIFO) block. The FIFO can be read out using a SPI interface. The AFE also has a fully-integrated LED driver with an 8-bit current control. The device has a high dynamic range transmit-and-receive circuitry that helps with the sensing of very small signal levels. Device Information(1) PART NUMBER PACKAGE AFE44S30 BODY SIZE (NOM) DSBGA (30) 2.60 mm × 2.10 mm (1) For all available packages, see the orderable addendum at the end of the data sheet. LED4 LED5 LED6 LED7 LED8 TX_SUP LED3 EN_LDO_BYP RX_SUP LED2 Simplified Schematic LED1 • 3 Description TX1 TX2 TX3 TX4 TX5 TX6 TX7 TX8 ALDO_1V8, DLDO_1V8 1.8V LDO LED_DRV2 LED_DRV1 INP1 INM1 Cf1 INP2 INM2 INP3 INM3 SPI Threshold Detection SPI Processing, Decimation Filters FIFO Rf1 IOFFDAC_LED1 • • • Optical heart-rate monitoring (HRM) for wearables, hearables Heart-rate variability (HRV) Pulse oximetry (SpO2) measurements IOFFDAC_AMB1 • Supports signal acquisition of up to 24 phases Flexible allocation of 8 LED, 4 PD in each phase Simultaneous signal acquisition from different sensors at different data rates Accurate, continuous heart-rate monitoring: – System SNR up to 108-dB at 16 μA PD current – 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 25 mA to 250 mA – Mode to fire two LEDs in parallel with independent per-phase current control – Programmable LED on-time per-phase – Simultaneous support of 8 LEDs for SpO2, HRM, or multi-wavelength HRM Receiver: – Supports 4 Time-Multiplexed Photodiode Inputs – 2 parallel receivers (two sets of TIA/filter) – Individual Ambient Offset Subtraction DAC at each TIA Input with 8-bit per-phase control and range adjustable up to 255-μA – Individual LED Offset Subtraction DAC at each TIA input with 5-bit per-phase control and 15.5µA range – Close to 100 dB ambient rejection up to 10 Hz – Noise filtering with programmable bandwidth – Transimpedance Gain: 3.7 kΩ to 1 MΩ Supports external clock and internal oscillator modes Option to acquire data synchronized with a system master clock Automatic cancellation of DC from ambient, LED FIFO with 128-sample depth SPI interface 2.6-mm × 2.1-mm DSBGA, 0.4-mm pitch Supplies: Rx: 1.7 V-1.9 V (LDO bypass); 1.9 V-3.6 V (LDO enabled), Tx: 3 V-5.5 V, IO: 1.7-3.6 V Switch Matrix 1 + TIA1 ± TI Gray Alternate Noise Reduction Filter MUX + ADC ± Rf1 ADC_RDY INP4 Cf1 INM4 AACM 4 MHz Oscillator Timing Engine GPIO2 2 PPG RX Channels 128 kHz Oscillator CLK 1 An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA. AFE44S30 SBASA24 – DECEMBER 2019 www.ti.com 4 Device and Documentation Support 4.1 Receiving Notification of Documentation Updates To receive notification of documentation updates, navigate to the device product folder on ti.com. In the upper right corner, click on Alert me to register and receive a weekly digest of any product information that has changed. For change details, review the revision history included in any revised document. 4.2 Support Resources TI E2E™ support forums are an engineer's go-to source for fast, verified answers and design help — straight from the experts. Search existing answers or ask your own question to get the quick design help you need. Linked content is provided "AS IS" by the respective contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of Use. 4.3 Trademarks E2E is a trademark of Texas Instruments. All other trademarks are the property of their respective owners. 4.4 Electrostatic Discharge Caution This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications. 4.5 Glossary SLYZ022 — TI Glossary. This glossary lists and explains terms, acronyms, and definitions. 5 Mechanical, Packaging, and Orderable Information The following pages include mechanical, packaging, and orderable information. This information is the most current data available for the designated devices. This data is subject to change without notice and revision of this document. For browser-based versions of this data sheet, refer to the left-hand navigation. 2 Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated Product Folder Links: AFE44S30 PACKAGE OPTION ADDENDUM www.ti.com 10-Dec-2020 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Pins Package Drawing Qty Eco Plan (2) Lead finish/ Ball material MSL Peak Temp Op Temp (°C) Device Marking (3) (4/5) (6) AFE44S30YZR ACTIVE DSBGA YZ 30 3000 RoHS & Green SAC396 Level-1-260C-UNLIM -40 to 85 AFE44S30 AFE44S30YZT ACTIVE DSBGA YZ 30 250 RoHS & Green SAC396 Level-1-260C-UNLIM -40 to 85 AFE44S30 (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may reference these types of products as "Pb-Free". RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption. Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of