Datasheet > AFE4490RHAT

AFE4490RHAT

更新时间： 2024-09-18 12:25:07

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德州仪器 - TI		/
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Integrated Analog Front-End for Pulse Oximeters

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AFE4490RHAT 数据手册

AFE4490

www.ti.com

SBAS602B –DECEMBER 2012–REVISED FEBRUARY 2013

Integrated Analog Front-End for Pulse Oximeters

Check for Samples: AFE4490

FEATURES

•

Fully-Integrated Analog Front-End for

Pulse Oximeter Applications:

•

Package: Compact QFN-40 (6 mm × 6 mm)

Specified Temperature Range: –40°C to +85°C

–

Flexible Pulse Sequencing and

Timing Control

APPLICATIONS

•

Transmit:

•

Medical Pulse Oximeter Applications

Industrial Photometry Applications

–

Integrated LED Driver

(H-Bridge or Push/Pull)

110-dB Dynamic Range Across Full Range

(Enables Low Noise at Low LED Current)

DESCRIPTION

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

LED Current:

–

Programmable Ranges of 50 mA, 75 mA,

100 mA, 150 mA, and 200 mA,

receiver channel with

a 22-bit analog-to-digital

Each with 8-Bit Current Resolution

converter (ADC), an LED transmit section, and

diagnostics for sensor and LED fault detection. The

AFE4490 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

AFE4490, 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.

–

Low Power:

–

100 µA + Average LED Current

–

LED On-Time Programmability from

(50 µs + Settle Time) to 4 ms

Independent LED2 and LED1 Current

Reference

•

Receive Channel with High Dynamic Range:

–

Input-Referred Noise:

13 pA_RMS(0.1-Hz to 5-Hz Bandwidth)

The AFE4490 is a complete AFE solution packaged

in a single, compact QFN-40 package (6 mm ×

–

13.5 Noise-Free Bits (0.1 Hz to 5 Hz)

mm) and is specified over the operating

Analog Ambient Cancellation Scheme with

Selectable 1-µA to 10-µA Ambient Current

temperature range of –40°C to +85°C.

2.2-V Supply

–

Low Power: < 2.3 mA at 3.0-V Supply

Rx Sample Time: 50 µs to 250 µs

LED2 Data

Amb (LED2) Data

LED2

Stage

Gain

AMB_LED2

(LED2

Amb) Data

LED1 Data

AFE

SPI

SPI Interface

TIA

Buffer

ûꢀ ADC

C_PD

LED1

Amb (LED1) Data

(LED1 Amb) Data

AMB_LED1

I-V Amplifier with Seven Separate LED2 and

LED1 Programmable Feedback R and C

Settings

Photodiode

Diagnostic

PD Open or Short

Cable Off

Timing

Controller

LED Open or Short

–

Integrated Digital Ambient Estimation and

Subtraction

•

Integrated Fault Diagnostics:

LED Current

Control

DAC

LED

Driver

LED

–

Photodiode and LED Open and

Short Detection

OSC

AFE

–

Cable On/Off Detection

Tx Driver

Supply

5-V Supply

MHz

•

Supplies:

–

Rx = 2.0 V to 3.6 V

Tx = 3.0 V or 5.25 V

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

SPI is a trademark of Motorola.

All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

12 3 4 5 6 7...70

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AFE4490RHAT 替代型号

型号	品牌	替代类型	描述	数据表
AFE4490RHAR	TI	完全替代	Integrated Analog Front-End for Pulse Oximeters

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