LH001-91 is a high-precision and low-cost analog front end: it supports EEG, ECG measurement and other functions, and integrates low-noise PGA and 24-bit, 8kSPS analog-to-digital converter on-chip. On-chip signal sources are integrated for continuous lead disconnection detection, channel path testing, and temperature measurement. In addition, the right leg drive output function that can realize closed-loop control is also integrated on the chip to improve the loop CMRR.

Product Features

● Low noise programmable gain amplifier (PGA) and high resolution 24-bit analog-to-digital converter (ADC)

- Programmable gain: 1/2/4/6/8/12/24/48

- 4 differential inputs

- Integral nonlinearity: 2 PPM/FS

● Electroencephalogram/electrocardiogram measurement (ECG/EEG)

- Input referred noise: 2.9 μVpp (250 SPS, gain 6)

- ECG channel input bias current: 200pA

- Data rate: 125SPS to 8kSPS

- Common Mode Rejection Ratio (CMRR): 117dB

- Built-in right leg drive amplifier, continuous disconnection detection, test signal

● Built-in oscillator and reference voltage

● Standby mode

- Current 0.2 μA

● power supply

- Analog: 2.4V to 3.6V

- Digital: 1.7V to 3.6V

● Built-in integrated excitation current source

● 4-wire SPI interface

● Operating temperature range: -40°C ~+85°C

● 40 pins, 5mm x5mm QFN package

● 30-ball, 2.95mm x2.95mm WLCSP package

Application Scenario

● Electroencephalogram (EEG)

● Biosafety certification and specific ECG applications, including:

-Wearable Heart Rate Monitor

-Single lead event monitoring, arrhythmia detection

-Single lead wireless patch, inpatient/outpatient monitoring