Texas Instruments Texas Instruments AFE4490 集成模拟前端
Texas Instruments AFE4490 集成模拟前端是一款非常适合于脉冲血氧仪应用的全集成模拟前端 (AFE)。此 TI 器件包含一个具有 22 位模数转换器 (ADC) 的低噪声接收器通道、一个 LED 传输单元和针对传感器以及 LED 故障检测的诊断功能。AFE4490 是一款可配置定时控制器，这种灵活性使得用户能够完全控制器件定时特性。为了简化计时要求并为 AFE4490 提供一个低抖动时钟，还集成了一个通过外部晶振运行的振荡器。此器件通过 SPI 接口与外部微控制器或主机处理器通信。
应用
- Fully-Integrated Analog Front-End for Pulse Oximeter Applications
- Flexible Pulse Sequencing and Timing Control
- Transmit
- Integrated LED Driver (H-Bridge or Push/Pull)
- 110dB Dynamic Range Across Full Range (Enables Low Noise at Low LED Current)
- LED Current: Programmable Ranges of 50mA, 75mA, 100mA, 150mA, and 200mA, Each with 8-Bit Current Resolution
- Low Power: 100µA + Average LED Current
- LED On-Time Programmability from (50µs + Settle Time) to 4ms
- Independent LED2 and LED1 Current Reference
- Receive Channel with High Dynamic Range
- Input-Referred Noise
- 50pARMS (at 5µA PD Current)
- 13.5 Noise-Free Bits (at 5µA PD Current)
- Analog Ambient Cancellation Scheme with Selectable 1µA to 10µA Ambient Current
- Low Power: < 2.3mA at 3.0V Supply
- Integrated Fault Diagnostics
- Photodiode and LED Open and Short Detection
- Cable On/Off Detection
应用
- Medical Pulse Oximeter Applications
- Industrial Photometry Applications
Block Diagram
发布日期: 2013-07-16
| 更新日期: 2022-03-11