LH001-99 is a high-precision and low-cost analog front-end that supports functions such as EEG and ECG measurement.The chip integrates low-noise PGA and a 24 bit,8kSPS analog-to-digital converter.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.
characteristic
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:1.02μVpp(250 SPS,gain 24)
ECG channel input bias current:200pA
Data rate:125SPS to 8kSPS
Common mode rejection ratio(CMRR):117dB
Measurement current:640uA
Built in right leg driver amplifier,continuous disconnection detection,test signal
Built in oscillator and reference voltage
standby mode
Current 0.1μA
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
encapsulation
40 feet,5mm x5mm QFN package
30 feet,2.95mm x2.95mm WLCSP package
application
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
ADS1299,which is compatible with TI,is suitable for domestic substitution needs.