AFE4400 Texas instruments

AFE4400

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AFE4400

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Описание

The AFE4400 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 AFE4400, 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 0°C to 70°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)
- Dynamic Range: 95 dB
- LED Current:
  - Programmable to 50 mA with 8-Bit Current Resolution
- Low Power:
  - 100 µA + Average LED Current
- Programmable LED On-Time
- Independent LED2 and LED1 Current Reference
Receive Channel with High Dynamic Range:
- 13 Noise-Free Bits
- Low Power: < 670 µA at 3.3-V Supply
- Integrated Digital Ambient Estimation and Subtraction
- Flexible Receive Sample Time
- Flexible Transimpedance Amplifier with Programmable LED Settings
Integrated Fault Diagnostics:
- Photodiode and LED Open and
  Short Detection
- Cable On and Off Detection
Supplies:
- Rx = 2.0 V to 3.6 V
- Tx = 3.0 V to 5.25 V
Package: Compact VQFN-40 (6 mm × 6 mm)
Specified Temperature Range: 0°C to 70°C

Applications	Clinical fingertip pulse oximetry, SpO2
Number of input channels	1
Resolution (Bits)	22
Number of LEDs	2
Interface type	SPI
Operating temperature range (°C)	0 to 70
Rating	Catalog