MM1217

MITSUMI Flame Detection Amplifier MM1217 Flame Detection Amplifier Monolithic IC MM1217 Outline This IC is comprised of an operation amplifier, a comparator, and a reference power source. It is worthy of note that the input offset voltage and the input offset voltage temperature drift of this operation amplifier are one digit less than those of conventional products regardless of the single power supply. Formerly, offset voltage adjustment was required for flame detection using a thermocouple on gas appliances, but with this IC adjustment is not required. Due to the single power supply, low current consumption, and low offset voltage, two batteries can be used for operation, making it appropriate for equipment that amplifies the very small signal of portable equipment. Features General 1. Power supply voltage (single batteries) 2. Current consumption 3. Power supply line elimination ratio Amplifier section 1. Low input offset voltage 2. Low input offset voltage drift (-20°C~+75°C) 3. Input offset current 4. Input bias current 5. Gain (Open roop) Comparator Section 1. Input offset voltage 2. Low input offset voltage drift (-20°C~+75°C) 3. Input bias current 4. Output sink current Reference Voltage Section 1. Reference voltag 2. Reference voltage temperature characteristics 3. Output current VCC=1.8V~6V (It is available to operate by two dry cell batteries.) 0.1mA typ. 60dB typ. ±0.1mV typ. ±1.0µV/°C typ. 1nA typ. 50nA typ. 100dB typ. ±1.0mV typ. ±10µV/°C typ. ±25nA typ. 5mA min. 1.27V±0.05V ±100ppm/°C typ. 0.3mA min. Package SOP-8C (MM1217XF) SIP-9A (MM1217XS) Applications 1. Gas burners 2. Instantaneous gas water heaters MITSUMI Flame Detection Amplifier MM1217 Pin Assignment MM1217XF Pin No. 1 1 2 3 4 2 3 SOP-8C MM1217XS 4 5 6 123456789 SIP-9A 7 8 9 Pin Function MM1217XF AIN+ AINAOUT GND COMPINVS COMPOUT VCC MM1217XS AIN+ AINAOUT COMPIN+ GND COMPINVS COMPOUT VCC 8 7 6 5 Pin Function Pin No. (SOP-8C) Internal Equivalent Circuit Pin No. Pin Function Internal Equivalent Circuit Pin Function 1 AIN+ 5 COMPIN- 2 AIN- 6 VS 3 AOUT 7 COMPOUT MITSUMI Flame Detection Amplifier MM1217 Block Diagram MM1217XF MM1217XS Absolute Maximum Ratings Item Storage temperature Operating temperature Power supply voltage Input voltage (Ta=25°C) Symbol TSTG TOPR VCC max. VIN Pd Specification -40~+125 -20~+75 -0.3~+10 -0.3~+10 MM1217XF MM1217XS 300 470 Units °C °C V V mW Allowable power dissipation Electrical Characteristics Item Current consumption (Unless otherwise specified Ta=25°C, VCC=3V, VIN=0V) Symbol ICC IOVS1 VS1 VS1 PSRR VCC VI VIOA VIOA IIOA IBA GV IOA VOA RL=100kΩ VIN=10mV, VO1=0.5V VIN=-5~25mV RL=10kΩ 80 0.5 0.01 VCC -1.0 f=100Hz 50 1.8 -0.2 0.3 1.22 1.27 ±100 60 3.0 6.0 0.3 1.32 Measurement Conditions Min. Typ. Max. Units 0.1 0.15 mA mA V ppm/°C dB V V Reference voltage output current Reference voltage Reference voltage temperature drift Power supply line elimination ratio Power supply voltage range Input voltage range Input offset voltage Input offset voltage temperature drift Amplifier section Input offset current Input bias current Gain Output current Output voltage ±0.1 ±0.35 mV ±1.0 1 50 100 ±3.0 µV/°C 10 150 nA nA dB mA V MITSUMI Flame Detection Amplifier MM1217 Electrical Characteristics Item Input offset voltage Input offset voltage Comparator Section temperature drift Input bias current Output sink current Output leak current Unless otherwise specified (Ta=25°C, VCC=3V, VIN=0V) Symbol VIOC VIOC IBC ISINK ILC ISAT Measurement Conditions VIN=-5mV VIN=-5mV VIN=-5mV VIN=10mV, VO2=0.4V VO2=VCC+1V VIN=10mV, ISINK=5mA 200 5 0.2 400 Min. Typ. Max. Units ±1.0 ±10 25 ±3.5 mV ±30 µV/°C 75 nA mA µA mV Output saturation voltage Note 1 : Amplifier output ··· emitter-follower (pull-down resistance 22kΩ) Note 2 : Comparator output ··· open collector Application Circuits Flame detection circuit using a thermocouple (single power source) Note : Use a gain range of 20dB-50dB in the amplifier section (40dB recommended) . Also, insert the capacitor between output 3 and GND instead of parallel to R2 in order to eliminate noise from the input. Please note that use of the equipment under different conditions will cause vibration.