AFE4403_15 Datasheet, PDF (1/97 Pages) Texas Instruments – AFE4403 Ultra-Small, Integrated Analog Front-End for Heart Rate Monitors and Low-Cost Pulse Oximeters

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AFE4403
SBAS650B – MAY 2014 – REVISED JULY 2014
AFE4403 Ultra-Small, Integrated Analog Front-End for Heart Rate Monitors and
Low-Cost Pulse Oximeters
1 Features
•1 Fully-Integrated AFE for Pulse Oximeter and
Heart Rate Monitoring Applications:
• Transmit:
– Integrated Dual LED Driver
(H-Bridge or Common Anode)
– Option for a Third LED Support for Optimized
SPO2, HRM, or Multi-Wavelength HRM
– Up to 110-dB Dynamic Range
– LED Current:
– Programmable to 100 mA with 8-Bit
Current Resolution
– 30 µA + Average LED Current
– Programmable LED On-Time
– Independent LED2 and LED1 Current
Reference
• Receive Channel with High Dynamic Range:
– 22-Bit Output in Twos Complement Format
– Up to 105-dB Dynamic Range
– Low Power: < 650 µA
– Dynamic Power-Down Mode to Reduce
Current to 300 µA
– Adaptable to a Very Wide Range of Signal
Amplitudes:
– Total Programmable Gain: 10 kΩ to 4 MΩ
– Integrated Digital Ambient Estimation and
Subtraction
• Flexible Clocking by External Clock or Crystal:
– Pulse Frequency: 62.5 SPS to 2000 SPS
– Flexible Pulse sequencing and Timing Control
– Input Clock Range: 4 MHz (Min) to 60 MHz
(Max)
• Integrated Fault Diagnostics:
– Photodiode and LED Open and
Short Detection
• Supplies:
– Rx = 2.0 V to 3.6 V
– Tx = 3.0 V to 5.25 V
• Package: Compact DSBGA-36
(3.07 mm × 3.07 mm × 0.5 mm)
• Specified Temperature Range: –20°C to 70°C
2 Applications
• Medical Pulse Oximeter Applications
• Optical HRM
• Industrial Photometry Applications
3 Description
The AFE4403 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 AFE4403, 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 DSBGA-36 (3.07 mm × 3.07 mm ×
0.5 mm) and is specified over the operating
temperature range of –20°C to 70°C.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
AFE4403
DSBGA (36)
3.07 mm × 3.07 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.