產品詳細資料

Applications Clinical fingertip pulse oximetry, SpO2 Number of input channels 1 Resolution (bps) 22 Number of LEDs 2 Interface type SPI Operating temperature range (°C) -40 to 85 Rating Catalog
Applications Clinical fingertip pulse oximetry, SpO2 Number of input channels 1 Resolution (bps) 22 Number of LEDs 2 Interface type SPI Operating temperature range (°C) -40 to 85 Rating Catalog
VQFN (RHA) 40 36 mm² 6 x 6
  • Fully-Integrated Analog Front-End for
    Pulse Oximeter Applications:
    • Flexible Pulse Sequencing and
      Timing Control
  • Transmit:
    • Integrated LED Driver (H-Bridge, Push, or Pull)
    • 110-dB Dynamic Range Across Full Range (Enables Low Noise at Low LED Current)
    • LED Current:
      • Programmable Ranges of 50 mA, 75 mA, 100 mA, 150 mA, and 200 mA,
        Each with 8-Bit Current Resolution
    • Low Power:
      • 100 µA + Average LED Current
    • LED On-Time Programmability from
      (50 µs + Settle Time) to 4 ms
    • Independent LED2, LED1 Current Reference
  • Receive Channel with High Dynamic Range:
    • Input-Referred Noise:
      50 pARMS (at 5-µA PD Current)
    • 13.5 Noise-Free Bits (at 5-µA PD Current)
    • Analog Ambient Cancellation Scheme with Selectable 1-µA to 10-µA Ambient Current
    • Low Power: < 2.3 mW at 3.0-V Supply
    • Rx Sample Time: 50 µs to 4 ms
    • I-V Amplifier with Seven Separate LED2 and LED1 Programmable Feedback R and C Settings
    • Integrated Digital Ambient Estimation and Subtraction
  • Integrated Fault Diagnostics:
    • Photodiode and LED Open and
      Short Detection
    • Cable On or Off Detection
  • Supplies:
    • Rx = 2.0 V to 3.6 V
    • Tx = 3.0 V or 5.25 V
  • Package: Compact VQFN-40 (6 mm × 6 mm)
  • Specified Temperature Range: –40°C to 85°C
  • Fully-Integrated Analog Front-End for
    Pulse Oximeter Applications:
    • Flexible Pulse Sequencing and
      Timing Control
  • Transmit:
    • Integrated LED Driver (H-Bridge, Push, or Pull)
    • 110-dB Dynamic Range Across Full Range (Enables Low Noise at Low LED Current)
    • LED Current:
      • Programmable Ranges of 50 mA, 75 mA, 100 mA, 150 mA, and 200 mA,
        Each with 8-Bit Current Resolution
    • Low Power:
      • 100 µA + Average LED Current
    • LED On-Time Programmability from
      (50 µs + Settle Time) to 4 ms
    • Independent LED2, LED1 Current Reference
  • Receive Channel with High Dynamic Range:
    • Input-Referred Noise:
      50 pARMS (at 5-µA PD Current)
    • 13.5 Noise-Free Bits (at 5-µA PD Current)
    • Analog Ambient Cancellation Scheme with Selectable 1-µA to 10-µA Ambient Current
    • Low Power: < 2.3 mW at 3.0-V Supply
    • Rx Sample Time: 50 µs to 4 ms
    • I-V Amplifier with Seven Separate LED2 and LED1 Programmable Feedback R and C Settings
    • Integrated Digital Ambient Estimation and Subtraction
  • Integrated Fault Diagnostics:
    • Photodiode and LED Open and
      Short Detection
    • Cable On or Off Detection
  • Supplies:
    • Rx = 2.0 V to 3.6 V
    • Tx = 3.0 V or 5.25 V
  • Package: Compact VQFN-40 (6 mm × 6 mm)
  • Specified Temperature Range: –40°C to 85°C

The AFE4490 is a fully-integrated analog front-end (AFE) that is ideally suited for pulse-oximeter applications. The device consists of a low-noise receiver channel with a 22-bit analog-to-digital converter (ADC), an LED transmit section, and diagnostics for sensor and LED fault detection. The device is a very configurable timing controller. This flexibility enables the user to have complete control of the device timing characteristics. To ease clocking requirements and provide a low-jitter clock to the device, an oscillator is also integrated that functions from an external crystal. The device communicates to an external microcontroller or host processor using an SPI™ interface.

The device is a complete AFE solution packaged in a single, compact VQFN-40 package (6 mm × 6 mm) and is specified over the operating temperature range of –40°C to 85°C.

The AFE4490 is a fully-integrated analog front-end (AFE) that is ideally suited for pulse-oximeter applications. The device consists of a low-noise receiver channel with a 22-bit analog-to-digital converter (ADC), an LED transmit section, and diagnostics for sensor and LED fault detection. The device is a very configurable timing controller. This flexibility enables the user to have complete control of the device timing characteristics. To ease clocking requirements and provide a low-jitter clock to the device, an oscillator is also integrated that functions from an external crystal. The device communicates to an external microcontroller or host processor using an SPI™ interface.

The device is a complete AFE solution packaged in a single, compact VQFN-40 package (6 mm × 6 mm) and is specified over the operating temperature range of –40°C to 85°C.

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* Data sheet AFE4490 Integrated Analog Front-End for Pulse Oximeters datasheet (Rev. H) PDF | HTML 2014年 10月 29日
EVM User's guide AFE44x0SPO2EVM User's Guide (Rev. C) 2014年 5月 27日

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開發板

AFE4490SPO2EVM — 適用於脈搏血氧儀的 AFE4490 整合式類比前端 (AFE) 評估模組

The AFE44x0SPO2EVM is intended for evaluating AFE4400 and AFE4490 devices. The family of devices are fully integrated AFE ideally suited for Pulse Oximeter applications and consist of low noise receive channel, the LED transmit section and diagnostics for sensor and LED fault detection. The (...)

使用指南: PDF
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SLAC679 AFE4490SPO2EVM Firmware Source v1.4

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支援產品和硬體

產品
生物感測 AFE
AFE4490 適用脈搏血氧儀的整合式類比前端 (AFE)
硬體開發
開發板
AFE4490SPO2EVM 適用於脈搏血氧儀的 AFE4490 整合式類比前端 (AFE) 評估模組
開發模組 (EVM) 的 GUI

SLAC556 AFE44x0SPO2EVM GUI v2.4

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產品
生物感測 AFE
AFE4400 適用心率監控器及低成本脈搏血氧儀的整合式類比前端 (AFE) AFE4490 適用脈搏血氧儀的整合式類比前端 (AFE)
硬體開發
開發板
AFE4400SPO2EVM 適用於心率監控器和低成本脈搏血氧儀的 AFE4400 整合式 AFE 評估模組 AFE4490SPO2EVM 適用於脈搏血氧儀的 AFE4490 整合式類比前端 (AFE) 評估模組
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AFE4490 IBIS Model

SBAM167.ZIP (17 KB) - IBIS Model
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PSPICE-FOR-TI — PSpice® for TI 設計與模擬工具

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
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