Texas Instruments AFE159x 4-Channel 24-Bit Analog Front-Ends (AFEs)
Texas Instruments AFE159x 4-Channel 24-Bit Analog Front-Ends (AFEs) are a family of multichannel, 24-bit, simultaneous sampling, delta-sigma (ΔΣ) analog-to-digital converters (ADCs) with built-in programmable gain Instrumentation Amplifiers (INAs), internal reference, and an on-chip PLL. The AFE supports digital pace pulse detection and thoracic impedance measurement and incorporates all of the features commonly required in medical electroencephalogram (EEG) and electrocardiogram (ECG) applications. Multiple Texas Instruments AFE159x devices can be cascaded in high channel count systems. With exceptional performance and high levels of integration, the AFE159x enables the development of scalable medical instrumentation systems at significantly reduced power, size, and overall cost.
Features
- Integrated signal chain for ECG, pace detection, and respiration measurement
- ECG receiver
- Four high-resolution channels at low power of 0.42mW/channel
- Flexible four leads selectable from six electrodes
- Programmable gain: 1.25 to 9
- Input-referred noise: 4µVPP in 150Hz BW
- Differential input range: ±1V with Gain = 4
- CMRR: -140dB
- Data rate: 125SPS to 128kSPS
- Pace detection
- On-chip digital pace detection algorithm on programmable two leads
- High-speed 128kSPS pace output on two channels for software pace detection
- Respiration
- Low noise of 24mΩPP with 2kΩ body impedance and 1kΩ defibrillator protection resistor on each electrode
- Supports Sine and Square wave excitation
- Other features
- Built-in right-leg drive amplifier steerable to any electrode
- DC lead-off detection, AC lead impedance detection, Wilson Center Terminal (WCT), Goldberger Central Terminals (GCT), test signals
- Battery voltage monitoring
- Flexible power-down and standby modes
- Built-in oscillator, PLL, and reference
- 1k sample main FIFO and 2k sample pace FIFO
- SPI-compatible serial interface
- Analog supply voltage 1: 3.15V to 5.25V
- Analog supply voltage 2: 1.7V to 1.9V
- I/O supply voltage: 1.65V to 3.6V
- Supports systems meeting AAMI EC11, AMI EC13, AMI EC38, IEC60601-1, IEC60601-2-25, IEC60601-2-27, and IEC60601-2-51 standards
Applications
- Event, stress, and vital sign monitors
- ECGs
- AEDs
- Telemedicine Bispectral Index (BIS)
- Evoked Audio Potential (EAP)
- Sleep study monitor
- Medical instrumentation (ECG, EMG, and EEG)
- Bedside patient monitoring and diagnostic ECG
- Portable telemetry
- Holter monitor and multi-lead patch
Yayınlandı: 2025-02-25
| Güncellenmiş: 2025-06-13