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AFE4490RHAT

Analogue Front End Device, Pulse Oximeter, 3 V to 5.25 V, VQFN-40

AFE4490RHAT - Analogue Front End Device, Pulse Oximeter, 3 V to 5.25 V, VQFN-40

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Manufacturer Part No:
AFE4490RHAT
Order Code:
3123349

Product Overview

The AFE4490RHAT is a fully-integrated Analog Front End 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.
  • Flexible pulse sequencing and timing control
  • Transmit - Integrated LED driver (H-Bridge, Push or Pull)
  • Transmit - 110dB Dynamic range across full range (Enables low noise at low LED current)
  • Transmit - Programmable ranges of 50mA, 75mA 100mA, 150mA and 200mA, with 8-bit current resolution
  • Transmit - LED on-time programmability from (50µs + Settle Time) to 4ms
  • Transmit - Independent LED2, LED1 current reference
  • Receive channel with high dynamic range
  • Receive - 50pARMS (at 5µA PD Current) Input-referred noise
  • Receive - 13.5 Noise-free bits (at 5µA PD Current)
  • Receive - Analog ambient cancellation scheme with selectable 1 to 10µA Ambient current
  • Receive - 50µs to 4ms Rx Sample time
  • Receive - I-V Amplifier with seven separate LED2 and LED1 programmable feedback R and C settings
  • Receive - Integrated digital ambient estimation and subtraction
  • Integrated fault diagnostics - Photodiode and LED Open/Short detection, Cable ON or OFF detection

Applications

Metering, Medical, Industrial

Product Information

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:
Analogue Front End Device

:
3V

:
5.25V

:
VQFN

:
40Pins

:
-40°C

:
85°C

:
-

:
-

:
MSL 3 - 168 hours
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