AFE4490
- Fully-Integrated Analog Front-End for
Pulse Oximeter Applications:- Flexible Pulse Sequencing and
Timing Control
- Flexible Pulse Sequencing and
- Transmit:
- Integrated LED Driver (H-Bridge, Push, or Pull)
- 110-dB Dynamic Range Across Full Range (Enables Low Noise at Low LED Current)
- LED Current:
- Programmable Ranges of 50 mA, 75 mA, 100 mA, 150 mA, and 200 mA,
Each with 8-Bit Current Resolution
- Programmable Ranges of 50 mA, 75 mA, 100 mA, 150 mA, and 200 mA,
- Low Power:
- 100 µA + Average LED Current
- LED On-Time Programmability from
(50 µs + Settle Time) to 4 ms - Independent LED2, LED1 Current Reference
- Receive Channel with High Dynamic Range:
- Input-Referred Noise:
50 pARMS (at 5-µA PD Current) - 13.5 Noise-Free Bits (at 5-µA PD Current)
- Analog Ambient Cancellation Scheme with Selectable 1-µA to 10-µA Ambient Current
- Low Power: < 2.3 mW at 3.0-V Supply
- Rx Sample Time: 50 µs to 4 ms
- I-V Amplifier with Seven Separate LED2 and LED1 Programmable Feedback R and C Settings
- Integrated Digital Ambient Estimation and Subtraction
- Input-Referred Noise:
- Integrated Fault Diagnostics:
- Photodiode and LED Open and
Short Detection - Cable On or Off Detection
- Photodiode and LED Open and
- Supplies:
- Rx = 2.0 V to 3.6 V
- Tx = 3.0 V or 5.25 V
- Package: Compact VQFN-40 (6 mm × 6 mm)
- Specified Temperature Range: –40°C to 85°C
The AFE4490 is a fully-integrated analog front-end (AFE) 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.
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 –40°C to 85°C.
技術文件
| 重要文件 | 類型 | 標題 | 格式選項 | 下載最新的英文版本 | 日期 | |
|---|---|---|---|---|---|---|
| * | 資料表 | AFE4490 Integrated Analog Front-End for Pulse Oximeters datasheet (Rev. H) | PDF | HTML | 2014/10/29 |
設計與開發
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AFE4490SPO2EVM — 適用於脈搏血氧儀的 AFE4490 整合式類比前端 (AFE) 評估模組
The AFE44x0SPO2EVM is intended for evaluating AFE4400 and AFE4490 devices. The family of devices are fully integrated AFE ideally suited for Pulse Oximeter applications and consist of low noise receive channel, the LED transmit section and diagnostics for sensor and LED fault detection. The (...)
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| VQFN (RHA) | 40 | Ultra Librarian |
訂購與品質
建議產品可能具有與此 TI 產品相關的參數、評估模組或參考設計。