AFE4403 Texas instruments

AFE4403

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AFE4403

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Описание

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.

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: 0°C–20°C to 70°C

Applications	Clinical fingertip pulse oximetry, SpO2
Number of input channels	1
Resolution (Bits)	22
Number of LEDs	3
Interface type	SPI
Operating temperature range (°C)	-20 to 70
Rating	Catalog