Overview
The AFE4490RHAT is a highly integrated analog front-end (AFE) designed by Texas Instruments specifically for pulse oximetry applications. This component is part of the AFE4490 series, known for its precision and efficiency in medical signal processing. It is targeted at medical device manufacturers and engineers developing advanced health monitoring systems, particularly those focused on non-invasive blood oxygen level detection. The AFE4490RHAT stands out for its low power consumption, high dynamic range, and integrated features that simplify system design.
Key Specifications
| Parameter | Value | Unit | Notes |
|---|---|---|---|
| Dynamic Range | 110 | dB | Low noise at low LED current |
| LED Current | 50mA to 200mA | mA | Programmable with 8-bit resolution |
| Power Consumption | < 2.3 | mW | At 3.0V supply |
| Rx Sampling Time | 50µs to 4ms | µs/ms | Programmable |
| Supply Voltage (Rx) | 2.0 to 3.6 | V | |
| Supply Voltage (Tx) | 3.0 or 5.25 | V | |
| Noise (Input Related) | 50 | pA RMS | At 5µA PD current |
| Noise-Free Bits | 13.5 | bits | At 5µA PD current |
| LED On Time | 50µs + setup time to 4ms | µs/ms | Programmable |
| Package | Compact QFN | Ultra-thin, leadless |
Key Features
- Fully integrated AFE for pulse oximetry applications.
- Flexible pulse sequencing and timing control.
- Integrated LED drivers with H-bridge and push-pull configurations.
- Low power consumption, ideal for portable medical devices.
- High dynamic range for accurate signal processing.
- Programmable LED current and on-time for customization.
- Integrated fault diagnostics for LED and photodiode monitoring.
Applications
The AFE4490RHAT is primarily used in medical devices, especially in pulse oximeters for non-invasive blood oxygen level monitoring. Its high precision and low power consumption make it suitable for portable health monitoring systems, wearable devices, and clinical equipment. Additionally, it can be applied in fitness trackers and other health-related consumer electronics where accurate signal processing is critical.
Q & A
What is the primary function of the AFE4490RHAT?
The AFE4490RHAT is designed as an analog front-end for pulse oximetry applications, enabling accurate measurement of blood oxygen levels.
What is the dynamic range of the AFE4490RHAT?
It offers a dynamic range of 110dB, ensuring low noise even at low LED currents.
Can the LED current be customized?
Yes, the LED current is programmable from 50mA to 200mA with 8-bit resolution.
What is the power consumption of the AFE4490RHAT?
It consumes less than 2.3mW when operating at a 3.0V supply.
What is the sampling time for the receiver channel?
The Rx sampling time is programmable from 50µs to 4ms.
What supply voltages are supported?
The Rx channel supports 2.0V to 3.6V, while the Tx channel supports 3.0V or 5.25V.
Does the AFE4490RHAT include fault diagnostics?
Yes, it includes integrated fault diagnostics for LED and photodiode monitoring.
What is the noise level of the AFE4490RHAT?
The input-related noise is 50 pA RMS at 5µA photodiode current.
What is the package type of the AFE4490RHAT?
It comes in a compact, ultra-thin QFN (Quad Flat No-leads) package.
Is the AFE4490RHAT suitable for wearable devices?
Yes, its low power consumption and high precision make it ideal for wearable health monitoring devices.
