AFE4490

AKTIV

Integriertes Analog-Frontend (AFE) für Pulsoximeter

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Datenblatt

document-pdfAcrobat AFE4490 Integrated Analog Front-End for Pulse Oximeters datasheet (Rev. H) (Englisch) PDF | HTML

AFE4490

AKTIV

Datenblatt

Jetzt bestellen

Produktdetails

Applications

Clinical fingertip pulse oximetry, SpO2

Number of input channels

1

Resolution (Bits)

22

Interface type

SPI

Operating temperature range (°C)

-40 to 85

Rating

Catalog

Applications

Clinical fingertip pulse oximetry, SpO2

Number of input channels

1

Resolution (Bits)

22

Interface type

SPI

Operating temperature range (°C)

-40 to 85

Rating

Catalog

VQFN (RHA)

40

36 mm² (6 mm × 6 mm)

Fully-Integrated Analog Front-End for
Pulse Oximeter Applications:
- Flexible Pulse Sequencing and
  Timing Control
Transmit:
- Integrated LED Driver (H-Bridge, Push, or Pull)
- 110-dB Dynamic Range Across Full Range (Enables Low Noise at Low LED Current)
- LED Current:
  - Programmable Ranges of 50 mA, 75 mA, 100 mA, 150 mA, and 200 mA,
    Each with 8-Bit Current Resolution
- Low Power:
  - 100 µA + Average LED Current
- LED On-Time Programmability from
  (50 µs + Settle Time) to 4 ms
- Independent LED2, LED1 Current Reference
Receive Channel with High Dynamic Range:
- Input-Referred Noise:
  50 pA_RMS (at 5-µA PD Current)
- 13.5 Noise-Free Bits (at 5-µA PD Current)
- Analog Ambient Cancellation Scheme with Selectable 1-µA to 10-µA Ambient Current
- Low Power: < 2.3 mW at 3.0-V Supply
- Rx Sample Time: 50 µs to 4 ms
- 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 or Off Detection
Supplies:
- Rx = 2.0 V to 3.6 V
- Tx = 3.0 V or 5.25 V
Package: Compact VQFN-40 (6 mm × 6 mm)
Specified Temperature Range: –40°C to 85°C

Fully-Integrated Analog Front-End for
Pulse Oximeter Applications:
- Flexible Pulse Sequencing and
  Timing Control
Transmit:
- Integrated LED Driver (H-Bridge, Push, or Pull)
- 110-dB Dynamic Range Across Full Range (Enables Low Noise at Low LED Current)
- LED Current:
  - Programmable Ranges of 50 mA, 75 mA, 100 mA, 150 mA, and 200 mA,
    Each with 8-Bit Current Resolution
- Low Power:
  - 100 µA + Average LED Current
- LED On-Time Programmability from
  (50 µs + Settle Time) to 4 ms
- Independent LED2, LED1 Current Reference
Receive Channel with High Dynamic Range:
- Input-Referred Noise:
  50 pA_RMS (at 5-µA PD Current)
- 13.5 Noise-Free Bits (at 5-µA PD Current)
- Analog Ambient Cancellation Scheme with Selectable 1-µA to 10-µA Ambient Current
- Low Power: < 2.3 mW at 3.0-V Supply
- Rx Sample Time: 50 µs to 4 ms
- 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 or Off Detection
Supplies:
- Rx = 2.0 V to 3.6 V
- Tx = 3.0 V or 5.25 V
Package: Compact VQFN-40 (6 mm × 6 mm)
Specified Temperature Range: –40°C to 85°C

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 receiver channel with a 22-bit 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 device, 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 –40°C to 85°C.

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 receiver channel with a 22-bit 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 device, 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 –40°C to 85°C.

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Top-Dokumentation	Typ	Titel	Format-Optionen	Neueste englische Version herunterladen	Datum
*	Datenblatt	AFE4490 Integrated Analog Front-End for Pulse Oximeters datasheet (Rev. H)	PDF \| HTML		29.10.2014

Design und Entwicklung

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Evaluierungsplatine

AFE4490SPO2EVM — AFE4490 – Evaluierungsmodul für integriertes Analog-Frontend (AFE) für Pulsoximeter

The AFE44x0SPO2EVM is intended for evaluating AFE4400 and AFE4490 devices. The family of devices are fully integrated AFE ideally suited for Pulse Oximeter applications and consist of low noise receive channel, the LED transmit section and diagnostics for sensor and LED fault detection. The (...)

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