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AFE4420YZT +BOM
Ultra-small integrated AFE with FIFO for multisensor wearable optical heart-rate monitoring
30-DSBGA-
Manufacturer:
-
Mfr.Part #:
AFE4420YZT
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Datasheet:
-
Number Of Bits:
24
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Number Of Channels:
4
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Mounting Type:
Surface Mount
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Base Product Number:
AFE4420
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EDA/CAD Models:
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Availability: 5619 PCS
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AFE4420YZT General Description
For optical bio-sensing applications such as heart-rate monitoring (HRM) and peripheral capillary oxygen saturation (SpO2), the AFE4420YZT offers a comprehensive analog front-end solution. With the ability to support multiple LEDs and photodiodes, as well as synchronized signal acquisition and storage in a FIFO block, the AFE4420 is well-equipped for capturing and processing data with precision. Its high dynamic range transmit-and-receive circuitry further enhances its performance in capturing very small signal levels. This makes the AFE4420 a versatile and reliable choice for a wide range of optical bio-sensing applications
Key Features
- Supports signal acquisition of up to 16 phases
- Flexible allocation of LEDs and PDs in each phase
- Accurate, continuous heart-rate monitoring:
- Up to 100-dB dynamic range
- Low current for continuous operation on a wearable device with a typical value
- 15 µA for an LED, 20 µA for the receiver
- Transmitter:
- Supports common anode LED configuration
- 8-Bit programmable LED current with range adjustable from 50 mA to 200 mA
- Mode to fire two LEDs in parallel
- Programmable LED on-time
- Simultaneous support of 4 LEDs for optimized SpO2, HRM, or multi-wavelength HRM
- Programmable control signals to extend operation to 8 LEDs using external SPDT switches
- Receiver:
- Supports 4 time-multiplexed photodiode inputs
- Individual DC offset subtraction DAC at TIA input for each LED, ambient with 7-bit control and range up to ±254 µA
- Transimpedance gain: 10 kΩ to 2 MΩ
- Digital ambient subtraction at ADC output to suppress ambient tones
- Noise filtering with programmable bandwidth
- Supports external clock and internal oscillator modes
- Automatic ambient cancellation mode (AACM) to increase receiver dynamic range
- Two programmable GPIO pins with flexible interrupt generation
- FIFO with 128-sample depth
- I2C, SPI interfaces: selectable by pin
- Operating temperature range: –40°C to +85°C
- 2.6-mm × 2.1-mm DSBGA, 0.4-mm pitch
- Supplies:
- Rx:
- 1.7 V to 1.9 V (LDO bypass)
- 1.9 V to 3.6 V (LDO enabled)
- Tx: 3 V to 5.5 V
- IO: 1.7 V to RX_SUP
- Rx:
Specifications
Category | Integrated Circuits (ICs)Data AcquisitionAnalog Front End (AFE) | Series | - |
Number of Bits | 24 | Number of Channels | 4 |
Voltage - Supply, Analog | - | Voltage - Supply, Digital | - |
Mounting Type | Surface Mount | Base Product Number | AFE4420 |
Applications | Optical-HRM | Number of input channels | 4 |
Resolution (Bits) | 22 | Number of LEDs | 4 |
Interface type | I2C | Operating temperature range (°C) | -40 to 85 |
Rating | Catalog | feature-resolution | |
feature-maximum-single-supply-voltage-v | feature-minimum-dual-supply-voltage-v | ||
feature-maximum-dual-supply-voltage-v | feature-power-supply-type | ||
feature-packaging | Tape and Reel | feature-minimum-single-supply-voltage-v | |
feature-rad-hard | feature-pin-count | 30 | |
feature-cecc-qualified | feature-esd-protection | ||
feature-escc-qualified | feature-military | No | |
feature-aec-qualified | No | feature-aec-qualified-number | |
feature-auto-motive | No | feature-p-pap | No |
feature-eccn-code | EAR99 | feature-svhc | |
feature-svhc-exceeds-threshold | No |
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In Stock: 5,619
Minimum Order: 1
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1+ | - | - |
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