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. The following are its main features and application scenarios:
·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
QFN40 and WLCSP30 are packaged for easy PCB layout.
Compatible with TI's ADS1291 and suitable for domestic substitution needs.
4. Manufacturer background
Linghui Lixin (Suzhou) focuses on high-performance analog and mixed signal chips, with products widely used in medical, industrial control, automotive electronics, and other fields.
Summary: LH001-91 is a highly integrated, low-noise, multi-channel ADC that is particularly suitable for medical electronics and biological signal acquisition. It has excellent noise performance and flexibility, which can reduce system design complexity and cost.