NJU9101MLE-TE1 Nisshinbo

NJU9101 Low Power Analog Front End FEATURES GENERAL DESCRIPTION Supply Voltage +2.4V to +3.6V NJU9101 is a Low Power Analog Front End IC for use Low Current Consumption 4A (OPA, OPB), in micro-power sensing applications, 150A (ADC) especially electrochemical sensors. It provides a Low Noise Amplifier 1.3Vpp typ. (0.1 to 10Hz) complete signal processing solution between sensor Low Offset Voltage Amplifier 300V max. and micro-processor as smart-sensor module. RF immunity Amplifier NJU9101 has 2 channel low power operational Programmable Cell Bias Voltage amplifiers. These amplifiers provide potentiostat and OPA: 0.3V to 1.7V (7 steps) trans-impedance-amplifiers to constitute gas sensor OPB: 0.25V to 1.75V (50mV step) systems. The NJU9101 has calibration circuit by using Programmable Gain Pre-Amplifier 1V/V to 8V/V output data of built-in high precision ADC. It is suitable High resolution Programmable Gain ADC for temperature variation of sensor. 1V/V to 8V/V, 16-Bit (NFB), 32sps to 2k sps NJU9101 operates over voltage range of 2.4V to 3.6V. System Calibration for offset & gain drift Total average current consumption can be less than Control external EEPROM as a Master device 5A. Ambient Operating Temperature -40C to +85C 2 Interface I C (3-Bit selectable slave address) Package EQFN-24-LE (4mm x 4mm) APPLICATION Gas Monitor Blood Glucose Meter Current Sensing Systems Low Power Systems Photodiode Sensing Systems Portable equipment EQUIVALENT CIRCUIT BLOCK DIAGRAM Ver.3 - 1 - NJU9101 PIN CONFIGURATION EQFN-24-LE PIN NO. SYMBOL DESCRIPTION Pin Type 2 1 SCL I C serial clock input Digital Input 2 I C serial data input / output 2 SDA Digital Input / Output (which requires an pull-up resistor) 2 I C serial clock output for external EEPROM 3 EXSCL Digital Output (which requires an pull-up register) 2 I C serial data input / output for external EEPROM 4 EXSDA Digital Input / Output (which requires an pull-up resister) 5 AD0 Chip address selection input 0 Select from 7 chip addresses 000 Digital Input to 110. Do not select address 6 AD1 Chip address selection input 1 Digital Input 111, which address is for 7 AD2 Chip address selection input 2 Digital Input production test purpose 8 TEST TEST terminal (This terminal is used for production test. Connect to VDD) Analog Input 9 VDD Voltage Supply Power Supply 10 VREFA+ Positive voltage reference input for ADC Analog Input 11 VREFIN Voltage reference input for Bias Resistor Analog Input 12 BOUT Voltage output for Bch. OpAmp Analog Output 13 BIN- Negative voltage input for Bch. OpAmp Analog Input 14 BIN+ Positive voltage input for Bch. OpAmp Analog Input 15 SWS Switch Source input / output Switch Input / Output 16 SWD Switch Drain input / output Switch Input / Output 17 AIN+ Positive voltage input for Ach. OpAmp Analog Input 18 AIN- Negative voltage input for Ach. OpAmp Analog Input 19 AOUT Voltage output for Ach. OpAmp Analog Output 20 AUXIN- Auxiliary negative input Analog Input 21 AUXIN+ Auxiliary positive input Analog Input Negative voltage reference input for ADC 22 VREFA- Analog Input (connect to GND, is recommended) 23 GND GND GND 24 RDYB RDYB output / GPIO Digital Input / Output PAD EXPPAD Exposed PAD on backside (connect to GND) GND Ver.3 - 2 -