AFE4460YBGT

AFE4460 SBASAL6 – JUNE 2022 AFE4460 Ultra-Small, Integrated AFE for Optical Bio-Sensing 1 Features 3 Description • • • • The AFE4460 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 32 switching lightemitting diodes (LEDs) and up to four photodiodes (PDs). The AFE has two LED drivers each with 8bit current control. The device has a high dynamic range transmit-and-receive circuitry that helps with the sensing of very small signal levels. Up to 16 signal phase sets can be defined, each phase set comprising a combination of LED and Ambient phases. Low noise offset DACs at the receiver inputs can be automatically controlled to cancel DC from Ambient and LED light. The current from each of the 4 PDs in each phase is converted into voltage by TIAs, filtered, and then digitized using a common ADC. The ADC code can be stored in a 256-sample FIFO block. The FIFO can be read out using a SPI or I2C interface. • • • • • • • 2 Applications • • • • Device Information PART NUMBER PACKAGE(1) BODY SIZE (NOM) AFE4460 DSBGA (36) 2.60 mm × 2.60 mm LDO_BYP For all available packages, see the orderable addendum at the end of the data sheet. RX_SUP (1) TX_SUP TXN1 TXN2 TXN3 TXN4 TXN5 TXN6 TXN7 TXN8 TXP1 TXP2 TXP3 TXP4 LDO VDD_INT TI Gray Alternate TX_SUP LED_DRV2 LED_DRV1 SPI, I2C SPI, I2C INP1 INM1 Cf1 INM2 INP3 INM3 FIFO Rf1 INP2 IOFFDAC_AMB1 • IOFFDAC_LED1 • Switch Matrix • Supports signal acquisition of up to 16 phase sets Supports up to 32 LEDs, 4 PDs Flexible allocation of LEDs, PDs in each phase Simultaneous signal acquisition from different sensors at different data rates Accurate, continuous PPG monitoring: – Low current for continuous heart-rate monitoring on a wearable device with a typical value: 15 μA for an LED, 15 μA for the receiver – Peak system SNR of 115 dB Transmitter: – 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 32 LEDs for SpO2, Multi-Wavelength HRM, and Spectroscopy Receiver: – Supports 4 Time-Multiplexed PD Inputs – 4 parallel receivers (4 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 9-bit per-phase control and 64µA range – Digital ambient subtraction at ADC output – Noise filtering with programmable bandwidth – Transimpedance gain: 3.7 kΩ to 1 MΩ Supports external clock or internal oscillator Option to acquire data synchronized with a system clock Automatic cancellation of DC from Ambient, LED FIFO with 256-sample depth SPI™ interface/ I2C interface 2.6-mm × 2.6-mm DSBGA, 0.4-mm Pitch Supplies: Rx:1.7 - 1.9 V (LDO Bypass); 1.9 - 3.6 V (LDO Enabled), Tx: 3-5.5 V, IO: 1.7-RX_SUP + TIA1 TI Gray Alternate – Noise Reduction Filter M U X ADC Processing, Decimation Filters 8 MHz Oscillator Timing Engine Rf1 ADC_RDY INP4 Cf1 INM4 AACM 4 PPG RX Channels GPIO 256 kHz Oscillator CLK Optical Heart-Rate Monitoring (HRM) for wearables, hearables Heart-Rate Variability (HRV) Pulse Oximetry (SpO2) measurements Optical Spectroscopy 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. AFE4460 www.ti.com SBASAL6 – JUNE 2022 Table of Contents 1 Features............................................................................1 2 Applications..................................................................... 1 3 Description.......................................................................1 4 Revision History.............................................................. 2 5 Device and Documentation Support..............................3 5.1 Documentation Support.............................................. 3 5.2 Receiving Notification of Documentation Updates......3 5.3 Support Resources..................................................... 3 5.4 Trademarks................................................................. 3 5.5 Electrostatic Discharge Caution..................................3 5.6 Glossary......................................................................3 6 Mechanical, Packaging, and Orderable Information.... 3 4 Revision History NOTE: Page numbers for previous revisions may differ from page numbers in the current version. 2 DATE REVISION NOTES June 2022 * Initial Release Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: AFE4460 AFE4460 www.ti.com SBASAL6 – JUNE 2022 5 Device and Documentation Support TI offers an extensive line of development tools. Tools and software to evaluate the performance of the device, generate code, and develop solutions are listed below. 5.1 Documentation Support 5.1.1 Related Documentation 5.2 Receiving Notification of Documentation Updates To receive notification of documentation updates, navigate to the device product folder on ti.com. Click on Subscribe to updates 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. 5.3 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. 5.4 Trademarks TI E2E™ is a trademark of Texas Instruments. All trademarks are the property of their respective owners. 5.5 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. 5.6 Glossary TI Glossary This glossary lists and explains terms, acronyms, and definitions. 6 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. Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: AFE4460 3 PACKAGE OPTION ADDENDUM www.ti.com 9-Dec-2022 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) Samples (4/5) (6) AFE4460YBGR ACTIVE DSBGA YBG 36 3000 RoHS & Green SAC396 Level-1-260C-UNLIM -40 to 85 AFE4460 Samples AFE4460YBGT ACTIVE DSBGA YBG 36 250 RoHS & Green SAC396 Level-1-260C-UNLIM -40 to 85 AFE4460 Samples (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