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LH001-91 is a high-precision and low-cost analog front-end that supports functions such as EEG and ECG measurement. It integrates low-noise PGA and a 24 bit, 8kSPS analog-to-digital converter on-chip. The chip integrates a signal source for continuous lead disconnection detection, channel path testing, and temperature measurement. In addition, the chip also integrates a right leg drive output function that can achieve closed-loop control, thereby improving the loop CMRR.

Product characteristics

·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-channel differential input

-Integral nonlinearity: 2 PPM/FS

·Electroencephalogram/Electrocardiogram Measurement (ECG/EEG)

-Input reference noise: 2.9 μ Vpp (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 driver amplifier, continuous disconnection detection, test signal

·Built in oscillator and reference voltage

·Standby mode

-Current 0.2 μ A

·Power supply

-Simulation: 2.4V to 3.6V

-Number: 1.7V to 3.6V

·Built in integrated excitation current source

·4-wire SPI interface

·Working temperature range:- 40°C~+85°C

·40 feet, 5mm x5mm QFN package

·30 balls, 2.95mm x2.95mm WLCSP package

Application scenarios

·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

ADS1294, which is compatible with TI, is suitable for domestic substitution needs.