AFE4400 Series

Integrated Analog Front End (AFE) for Heart-Rate Monitors and Low-Cost Pulse Oximeters

Catalog

Integrated Analog Front End (AFE) for Heart-Rate Monitors and Low-Cost Pulse Oximeters

Part	Supplier Device Package	Number of Bits	Power (Watts)	Mounting Type	Voltage - Supply, Analog [Max]	Voltage - Supply, Analog [Min]	Package / Case	Number of Channels	Voltage - Supply, Digital [Max]	Voltage - Supply, Digital [Min]	Type	Primary Attributes	Contents	Secondary Attributes	Utilized IC / Part	Function	Supplied Contents	Embedded
Texas Instruments AFE4400RHAT	40-VQFN (6x6)	22	2.84 mW	Surface Mount	3.6 V	2 V	40-VFQFN Exposed Pad	1	3.6 V	2 V
Texas Instruments AFE4400SPO2EVM											Interface	Medical Pulse Oximeter Applications	Board(s)	Graphical User Interface (GUI), SPI/USB Interface(s)	AFE4400	Analog Front End (AFE)	Board(s)	16-Bit, MCU
Texas Instruments AFE4400RHAR	40-VQFN (6x6)	22	2.84 mW	Surface Mount	3.6 V	2 V	40-VFQFN Exposed Pad	1	3.6 V	2 V

Catalog

Integrated Analog Front End (AFE) for Heart-Rate Monitors and Low-Cost Pulse Oximeters

Key Features

• Fully-Integrated Analog Front-End for Pulse Oximeter Applications:Flexible Pulse Sequencing andTiming ControlTransmit:Integrated LED Driver(H-Bridge, Push, or Pull)Dynamic Range: 95 dBLED Current:Programmable to 50 mA with 8-Bit Current ResolutionLow Power:100 µA + Average LED CurrentProgrammable LED On-TimeIndependent LED2 and LED1 Current ReferenceReceive Channel with High Dynamic Range:13 Noise-Free BitsLow Power: < 670 µA at 3.3-V SupplyIntegrated Digital Ambient Estimation and SubtractionFlexible Receive Sample TimeFlexible Transimpedance Amplifier with Programmable LED SettingsIntegrated Fault Diagnostics:Photodiode and LED Open andShort DetectionCable On and Off DetectionSupplies:Rx = 2.0 V to 3.6 VTx = 3.0 V to 5.25 VPackage: Compact VQFN-40 (6 mm × 6 mm)Specified Temperature Range: 0°C to 70°CFully-Integrated Analog Front-End for Pulse Oximeter Applications:Flexible Pulse Sequencing andTiming ControlTransmit:Integrated LED Driver(H-Bridge, Push, or Pull)Dynamic Range: 95 dBLED Current:Programmable to 50 mA with 8-Bit Current ResolutionLow Power:100 µA + Average LED CurrentProgrammable LED On-TimeIndependent LED2 and LED1 Current ReferenceReceive Channel with High Dynamic Range:13 Noise-Free BitsLow Power: < 670 µA at 3.3-V SupplyIntegrated Digital Ambient Estimation and SubtractionFlexible Receive Sample TimeFlexible Transimpedance Amplifier with Programmable LED SettingsIntegrated Fault Diagnostics:Photodiode and LED Open andShort DetectionCable On and Off DetectionSupplies:Rx = 2.0 V to 3.6 VTx = 3.0 V to 5.25 VPackage: Compact VQFN-40 (6 mm × 6 mm)Specified Temperature Range: 0°C to 70°C

Description

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. 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.