Afe4490rhar vqfn-40 (6x6) analog front end – AFE Ti inventory spot price optimal
Description of afe4490
Afe4490 is a fully integrated analog front end (AFE) which is very suitable for pulse oximeter applications. The device includes a low-noise receiver channel with a 22 bit analog-to-digital converter (ADC), an LED transmission unit, and diagnostic functions for sensor and led fault detection. This device is a configurable timing controller. This flexibility allows the user to fully control the timing characteristics of the device. In order to simplify the timing requirements and provide a low jitter clock for the device, an oscillator powered by an external crystal oscillator is also integrated. This device uses an SPI interface to communicate with an external microcontroller or host processor.
This device is a complete AFE solution in a single, compact vqfn-40 package (6mm x 6mm) with a rated operating temperature range of -40 ° C to 85 ° C.
Features of afe4490
Fully integrated analog front end for
Application of pulse oximeter:
Flexible pulse sequencing and
Timing control
send out:
Integrated light emitting diode (LED) driver (H-bridge, push-pull)
110dB dynamic range in the whole range (low noise at low LED current)
LED current:
Programmable ranges of 50mA, 75ma, 100mA, 150mA and 200mA,
Each has 8-bit current resolution
Low power consumption:
100 µ a + average LED current
Led on time programmability from
(50 µ S + establishment time) to 4ms
Independent LED2, LED1 current reference
Receive channel with high dynamic range:
Input related noise:
50 arms (measured at 5 µ a PD current)
13.5 no noise level (measured at 5 µ a PD current)
Analog environment elimination mechanism with 1 µ a to 10 µ a optional ambient current
3.0V power supply, low power consumption: < 2.3mw
RX sampling time: 50 µ s to 4ms
I-V amplifier with 7 separate LED2 and LED1 programmable feedback R and C settings
Integrated digital environment estimation and pruning
Integrated fault diagnosis:
Photodiode and led open circuit and
Short circuit detection
Cable connection or disconnection detection
Power Supply:
RX = 2.0V to 3.6V
TX = 3.0V or 5.25V
Package: compact ultra-thin square flat leadless (vqfn) -40 (6mm x 6mm)
Rated temperature range: -40 ° C to 85 ° C
Scope of application
Application of medical pulse oximeter
Application of industrial light measurement
Afe4490 is a fully integrated analog front end (AFE) which is very suitable for pulse oximeter applications. The device includes a low-noise receiver channel with a 22 bit analog-to-digital converter (ADC), an LED transmission unit, and diagnostic functions for sensor and led fault detection. This device is a configurable timing controller. This flexibility allows the user to fully control the timing characteristics of the device. In order to simplify the timing requirements and provide a low jitter clock for the device, an oscillator powered by an external crystal oscillator is also integrated. This device uses an SPI interface to communicate with an external microcontroller or host processor.
This device is a complete AFE solution in a single, compact vqfn-40 package (6mm x 6mm) with a rated operating temperature range of -40 ° C to 85 ° C.
Features of afe4490
Fully integrated analog front end for
Application of pulse oximeter:
Flexible pulse sequencing and
Timing control
send out:
Integrated light emitting diode (LED) driver (H-bridge, push-pull)
110dB dynamic range in the whole range (low noise at low LED current)
LED current:
Programmable ranges of 50mA, 75ma, 100mA, 150mA and 200mA,
Each has 8-bit current resolution
Low power consumption:
100 µ a + average LED current
Led on time programmability from
(50 µ S + establishment time) to 4ms
Independent LED2, LED1 current reference
Receive channel with high dynamic range:
Input related noise:
50 arms (measured at 5 µ a PD current)
13.5 no noise level (measured at 5 µ a PD current)
Analog environment elimination mechanism with 1 µ a to 10 µ a optional ambient current
3.0V power supply, low power consumption: < 2.3mw
RX sampling time: 50 µ s to 4ms
I-V amplifier with 7 separate LED2 and LED1 programmable feedback R and C settings
Integrated digital environment estimation and pruning
Integrated fault diagnosis:
Photodiode and led open circuit and
Short circuit detection
Cable connection or disconnection detection
Power Supply:
RX = 2.0V to 3.6V
TX = 3.0V or 5.25V
Package: compact ultra-thin square flat leadless (vqfn) -40 (6mm x 6mm)
Rated temperature range: -40 ° C to 85 ° C
Scope of application
Application of medical pulse oximeter
Application of industrial light measurement