AFE4490RHAR datasheet(1/70 Pages) TI

部品番号	AFE4490RHAR

部品情報	Integrated Analog Front-End for Pulse Oximeters

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メーカー	TI [Texas Instruments]

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LED2 Data

Amb (LED2) Data

LED1 Data

Amb (LED1) Data

AFE

SPI

(LED2 t Amb) Data

(LED1 t Amb) Data

+

Buffer

û ADC

+

TIA

+

Stage 2

Gain

Photodiode

CPD

Rx

SPI Interface

Diagnostic

PD Open or Short

Cable Off

LED Open or Short

LED

Driver

LED Current

Control

DAC

Timing

Controller

OSC

8 MHz

AFE

LED

5-V Supply

Tx Driver

Supply

2.2-V Supply

LED2

AMBLED2

LED1

AMBLED1

AFE4490

www.ti.com

SBAS602B – DECEMBER 2012 – REVISED FEBRUARY 2013

Integrated Analog Front-End for Pulse Oximeters

Check for Samples: AFE4490

1

FEATURES

23

•

Fully-Integrated Analog Front-End for

Pulse Oximeter Applications:

•

Package: Compact QFN-40 (6 mm × 6 mm)

–

Flexible Pulse Sequencing and

•

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

Timing Control

APPLICATIONS

•

Transmit:

•

Medical Pulse Oximeter Applications

–

Integrated LED Driver

(H-Bridge or Push/Pull)

•

Industrial Photometry Applications

–

110-dB Dynamic Range Across Full Range

DESCRIPTION

(Enables Low Noise at Low LED Current)

The AFE4490 is a fully-integrated analog front-end

–

LED Current:

(AFE)

that

is

ideally

suited

for

pulse-oximeter

–

Programmable Ranges of 50 mA, 75 mA,

applications. The device consists of a low-noise

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

–

Low Power:

diagnostics for sensor and LED fault detection. The

AFE4490 is a very configurable timing controller. This

–

100 µA + Average LED Current

flexibility enables the user to have complete control of

–

LED On-Time Programmability from

the device timing characteristics. To ease clocking

(50 µs + Settle Time) to 4 ms

requirements and provide a low-jitter clock to the

–

Independent LED2 and LED1 Current

AFE4490,

an

oscillator

is

also

integrated

that

functions from an external crystal. The device

Reference

communicates to an external microcontroller or host

•

Receive Channel with High Dynamic Range:

processor using an SPI™ interface.

–

Input-Referred Noise:

The AFE4490 is a complete AFE solution packaged

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

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

–

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

6

mm)

and

is

specified

over

the

operating

–

Analog Ambient Cancellation Scheme with

temperature range of –40°C to +85°C.

Selectable 1-µA to 10-µA Ambient Current

–

Low Power: < 2.3 mA at 3.0-V Supply

–

Rx Sample Time: 50 µs to 250 µs

–

I-V Amplifier with Seven Separate LED2 and

LED1 Programmable Feedback R and C

Settings

–

Integrated Digital Ambient Estimation and

Subtraction

•

Integrated Fault Diagnostics:

–

Photodiode and LED Open and

Short Detection

–

Cable On/Off Detection

•

Supplies:

–

Rx = 2.0 V to 3.6 V

–

Tx = 3.0 V or 5.25 V

1

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.

2

SPI is a trademark of Motorola.

3

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.

同様の部品番号 - AFE4490RHAR

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	AFE4490	2Mb / 96P	Integrated Analog Front-End for Pulse Oximeters

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