AFE4403 Ultra-Small Integrated Analog Front End (AFE) for Heart-Rate Monitors and Low-Cost Pulse Oximeters | TI.com

AFE4403 (ACTIVE)

Ultra-Small Integrated Analog Front End (AFE) for Heart-Rate Monitors and Low-Cost Pulse Oximeters

 

Recommended alternative parts

  • AFE4404  - The device has SIMILAR FUNCTIONALITY but is not functionally equivalent to the compared device. 
  • AFE4405  - The device has SIMILAR FUNCTIONALITY but is not functionally equivalent to the compared device. 
  • AFE4410  - The device has SIMILAR FUNCTIONALITY but is not functionally equivalent to the compared device. 

Description

The AFE4403 is a fully-integrated analog front-end (AFE) ideally suited for pulse oximeter applications. The device consists of a low-noise receiver channel with an integrated 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 AFE4403, 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 DSBGA-36 (3.07 mm × 3.07 mm × 0.5 mm) and is specified over the operating temperature range of –20°C to 70°C.

Features

  • Fully-Integrated AFE for Pulse Oximeter and Heart Rate Monitoring Applications:
  • Transmit:
    • Integrated Dual LED Driver
      (H-Bridge or Common Anode)
    • Option for a Third LED Support for Optimized SPO2, HRM, or Multi-Wavelength HRM
    • Up to 110-dB Dynamic Range
    • LED Current:
      • Programmable to 100 mA with 8-Bit Current Resolution
    • 30 µA + Average LED Current
    • Programmable LED On-Time
    • Independent LED2 and LED1 Current Reference
  • Receive Channel with High Dynamic Range:
    • 22-Bit Output in Twos Complement Format
    • Up to 105-dB Dynamic Range
    • Low Power: < 650 µA
    • Dynamic Power-Down Mode to Reduce Current to 300 µA
    • Adaptable to a Very Wide Range of Signal Amplitudes:
      • Total Programmable Gain: 10 kΩ to 4 MΩ
    • Integrated Digital Ambient Estimation and Subtraction
  • Flexible Clocking by External Clock or Crystal:
    • Pulse Frequency: 62.5 SPS to 2000 SPS
    • Flexible Pulse sequencing and Timing Control
    • Input Clock Range: 4 MHz (Min) to 60 MHz (Max)
  • Integrated Fault Diagnostics:
    • Photodiode and LED Open and
      Short Detection
  • Supplies:
    • Rx = 2.0 V to 3.6 V
    • Tx = 3.0 V to 5.25 V
  • Package: Compact DSBGA-36
    (3.07 mm × 3.07 mm × 0.5 mm)
  • Specified Temperature Range: –20°C to 70°C

Parametrics

Compare all products in Biosensing AFEs Email Download to Excel
Part number Order Number of input channels Resolution (Bits) Interface Number of LEDs Features Operating temperature range (C) Package Group Package size: mm2:W x L (PKG) Approx. price (US$)
AFE4403 Order now 1     22     SPI     3     Optical biosensing     -20 to 70     DSBGA | 36     See datasheet (DSBGA)     3.25 | 1ku    
AFE4404 Order now 1     24     I2C     3     Optical biosensing     -20 to 70     DSBGA | 15     See datasheet (DSBGA)     2.28 | 1ku    
AFE4405 Order now 2     24     I2C
SPI    
3     Optical biosensing     -20 to 70         2.50 | 1ku    
AFE4410 Order now 3     24     SPI
I2C    
4     Optical biosensing     -20 to 70         2.65 | 1ku    
AFE4490 Order now 1     22     Serial SPI     2     Optical biosensing     -40 to 85     VQFN | 40     40VQFN: 36 mm2: 6 x 6 (VQFN | 40)     7.95 | 1ku    
AFE4900 Order now 3     24     SPI
I2C    
4     Optical biosensing     -20 to 70         2.75 | 1ku