{"id":6396,"date":"2026-06-16T02:39:51","date_gmt":"2026-06-16T02:39:51","guid":{"rendered":"https:\/\/materialparts.com\/afe4490rhar\/"},"modified":"2026-06-16T02:39:51","modified_gmt":"2026-06-16T02:39:51","slug":"afe4490rhar","status":"publish","type":"post","link":"https:\/\/materialparts.com\/es\/afe4490rhar\/","title":{"rendered":"AFE4490RHAR"},"content":{"rendered":"

Productos<\/h2>\n

The AFE4490RHAR from Texas Instruments is a fully integrated analog front-end (AFE) for pulse oximeter applications. It integrates a 22-bit ADC, low-noise transimpedance amplifier with programmable gain, a flexible LED driver supporting H-bridge\/push\/pull configurations, and comprehensive diagnostics. Packaged in a VQFN-40 (6mm x 6mm), it enables complete pulse oximeter signal chains with minimal external components.<\/p>\n

Especificaciones<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
ADC Resolution<\/td>\n22 bits<\/td>\n<\/tr>\n
Number of LED Channels<\/td>\n2 (Red and IR)<\/td>\n<\/tr>\n
LED Current Ranges<\/td>\n50mA, 75mA, 100mA, 150mA, 200mA<\/td>\n<\/tr>\n
LED Current Resolution<\/td>\n8-bit per range<\/td>\n<\/tr>\n
Dynamic Range<\/td>\n110dB across full range<\/td>\n<\/tr>\n
Input-Referred Noise<\/td>\n50pARMS (at 5\u00b5A PD current)<\/td>\n<\/tr>\n
Noise-Free Bits<\/td>\n13.5 (at 5\u00b5A PD current)<\/td>\n<\/tr>\n
Rx Supply<\/td>\n2.0V to 3.6V<\/td>\n<\/tr>\n
Tx Supply<\/td>\n3.0V or 5.25V<\/td>\n<\/tr>\n
Rx Power Consumption<\/td>\n<2.3mW at 3.0V<\/td>\n<\/tr>\n
Interface<\/td>\nSPI<\/td>\n<\/tr>\n
Temperatura de funcionamiento<\/td>\n-40\u00b0C to +85\u00b0C<\/td>\n<\/tr>\n
Paquete<\/td>\nVQFN-40 (6 x 6 mm)<\/td>\n<\/tr>\n<\/table>\n

Caracter\u00edsticas<\/h2>\n
    \n
  • Fully integrated AFE for pulse oximetry<\/li>\n
  • Flexible LED driver with H-bridge, push, or pull configurations<\/li>\n
  • 110dB dynamic range enabling low LED current operation<\/li>\n
  • Programmable LED on-time: 50\u00b5s to 4ms<\/li>\n
  • Analog ambient cancellation with 1\u00b5A to 10\u00b5A range<\/li>\n
  • 7 separate feedback R and C settings per LED channel<\/li>\n
  • Built-in photodiode and LED open\/short diagnostics<\/li>\n
  • Cable on\/off detection<\/li>\n<\/ul>\n

    Aplicaciones<\/h2>\n
      \n
    • Clinical fingertip pulse oximeters<\/li>\n
    • Wearable SpO2 monitoring<\/li>\n
    • Industrial photometry<\/li>\n
    • Optical biosensors<\/li>\n
    • Patient monitoring systems<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The AFE4490RHAR from Texas Instruments is a fully integrated analog front-end (AFE) for pulse oximeter applications. It integrates a 22-bit ADC, low-noise transimpedance amplifier with programmable gain, a flexible LED driver supporting H-bridge\/push\/pull configurations, and comprehensive diagnostics. Packaged in a VQFN-40 (6mm x 6mm), it enables complete pulse oximeter signal chains with minimal […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[13,42],"tags":[],"chip_brand":[138],"class_list":["post-6396","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-sensors","chip_brand-ti"],"acf":{"brief_explanation":"Fully integrated 22-bit pulse oximeter AFE, 2-LED driver, 110dB dynamic range, VQFN-40","date_code":"","package_case":"VQFN-40 (6.00 x 6.00 mm)","in_stock":2870,"datasheet":"https:\/\/www.ti.com\/lit\/ds\/symlink\/afe4490.pdf","price":"$14.50 @ 1ku","product_introduction":"The AFE4490RHAR is a complete analog front-end for pulse oximeter applications from Texas Instruments. It integrates a 22-bit ADC with a low-noise transimpedance amplifier (TIA), programmable second-stage gain, and an LED driver section that supports H-bridge, push, and pull configurations for both Red and IR LEDs. The device achieves 110dB dynamic range across the full LED current range, enabling operation at lower LED currents for power-sensitive wearable applications. Input-referred noise of 50pARMS at 5\u00b5A photodiode current delivers 13.5 noise-free bits of resolution. The flexible timing controller allows complete control over LED pulse sequencing with programmable on-time from 50\u00b5s to 4ms. Integrated diagnostics include photodiode and LED open\/short detection plus cable on\/off monitoring.","working_principle":"The AFE4490RHAR operates as a synchronous sampling pulse oximeter AFE. The LED driver section drives Red and IR LEDs in a time-multiplexed sequence under control of the flexible timing controller. During each LED pulse, the photodiode current is converted to voltage by the TIA with seven selectable feedback resistor and capacitor settings per LED channel for optimal noise versus bandwidth tradeoffs. The second-stage amplifier provides additional programmable gain. An analog ambient cancellation circuit subtracts ambient light contribution (1\u00b5A to 10\u00b5A selectable) before the ADC. The 22-bit ADC digitizes each sample, and results are available via SPI. The timing controller independently manages LED2, Ambient(LED2), LED1, and Ambient(LED1) phases with programmable timing. Diagnostic circuits continuously monitor photodiode and LED integrity, reporting faults through the SPI interface.","pin_description":"
      Pin<\/th>Name<\/th>Type<\/th>Description<\/th><\/tr>
      1<\/td>INN<\/td>Analog Input<\/td>Negative input to TIA; connects to photodiode cathode<\/td><\/tr>
      2<\/td>INP<\/td>Analog Input<\/td>Positive input to TIA; connects to photodiode anode<\/td><\/tr>
      3<\/td>VCM<\/td>Analog Output<\/td>Common-mode voltage output; used as shield for INP\/INN traces<\/td><\/tr>
      10<\/td>TXN<\/td>Power<\/td>LED driver negative terminal; connects to LED cathode in H-bridge mode<\/td><\/tr>
      11<\/td>TXP<\/td>Power<\/td>LED driver positive terminal; connects to LED anode in H-bridge mode<\/td><\/tr>
      15<\/td>RX_ANA_SUP<\/td>Power<\/td>Analog receiver supply (2.0V to 3.6V)<\/td><\/tr>
      20<\/td>LED_DRV_SUP<\/td>Power<\/td>LED driver supply (3.0V to 5.25V)<\/td><\/tr>
      25<\/td>CLK<\/td>Input<\/td>External clock input from crystal oscillator (8MHz typical)<\/td><\/tr>
      30<\/td>SPICLK<\/td>Input<\/td>SPI serial clock input<\/td><\/tr>
      31<\/td>SPICS<\/td>Input<\/td>SPI chip select (active low)<\/td><\/tr>
      32<\/td>SPIDIN<\/td>Input<\/td>SPI data input<\/td><\/tr>
      33<\/td>SPIDOUT<\/td>Output<\/td>SPI data output<\/td><\/tr><\/table>","application_scenarios":"
      • Clinical Fingertip Pulse Oximeter:<\/b> Complete SpO2 and pulse rate measurement solution with Red (660nm) and IR (940nm) LED drivers, achieving clinical-grade accuracy with 22-bit resolution and 50pARMS input noise<\/li>
      • Wearable SpO2 Monitor:<\/b> Continuous blood oxygen monitoring in smartwatches and fitness bands with less than 2.3mW receive power and programmable low LED current operation extending battery life<\/li>
      • Industrial Photometry:<\/b> Precision optical measurement in liquid analysis and gas sensing applications using the flexible LED timing and 110dB dynamic range for wide concentration measurement<\/li>
      • Patient Monitoring System:<\/b> Multi-parameter patient monitors with integrated cable detection and LED\/PD diagnostics ensuring reliable operation in hospital environments<\/li>
      • Optical Biosensor:<\/b> Research and development of PPG-based blood pressure and cardiac output estimation algorithms leveraging the high-resolution 22-bit data and flexible timing control<\/li><\/ul>","alternative_models":"
        Model<\/th>Manufacturer<\/th>Resolution<\/th>LEDs<\/th>Key Difference<\/th><\/tr>
        AFE4404<\/td>TI<\/td>24-bit<\/td>3<\/td>Higher resolution, 3-LED support for SpO2 + multi-wavelength<\/td><\/tr>
        AFE4405<\/td>TI<\/td>24-bit<\/td>4<\/td>4-LED, more flexible for advanced biosensing<\/td><\/tr>
        MAX30102<\/td>ADI<\/td>18-bit<\/td>2<\/td>Integrated LEDs and PD in module package<\/td><\/tr>
        MAX86141<\/td>ADI<\/td>19-bit<\/td>3<\/td>Higher resolution, 3-LED, lower power<\/td><\/tr>
        OB1203<\/td>Renesas<\/td>20-bit<\/td>3<\/td>Integrated light-to-digital with ambient light sensor<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/6396","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/comments?post=6396"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/posts\/6396\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/media?parent=6396"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/categories?post=6396"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/tags?post=6396"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/es\/wp-json\/wp\/v2\/chip_brand?post=6396"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}