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AFE4490RHAT

Integrated Analog Front End (AFE) for Pulse Oximeters

 

 Features

  •     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

Texas Instruments  AFE4490RHAT

     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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LTC1865 16BIT 250k ADC

  • Fiyat : 140.00TL
  • KDV Dahil : 165.20TL

Tags: AFE4490RHAT, Integrated Analog Front End, AFE, Pulse Oximeters