MITSUMI MM1217

Flame Detection Amplifier MM1217
MITSUMI
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
VCC=1.8V~6V
(It is available to operate by two dry cell batteries.)
0.1mA typ.
60dB typ.
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)
±0.1mV typ.
±1.0µV/°C typ.
1nA typ.
50nA typ.
100dB typ.
Comparator Section
1. Input offset voltage
2. Low input offset voltage drift (-20°C~+75°C)
3. Input bias current
4. Output sink current
±1.0mV typ.
±10µV/°C typ.
±25nA typ.
5mA min.
Reference Voltage Section
1. Reference voltag
2. Reference voltage temperature characteristics
3. Output current
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
Flame Detection Amplifier MM1217
MITSUMI
Pin Assignment
MM1217XF
8
7
1
2
6
3
5
4
SOP-8C
MM1217XS
1 2 3 4 5 6 7 8 9
SIP-9A
Pin Function
Pin Function
Pin No.
MM1217XF
MM1217XS
1
AIN+
AIN+
2
AIN-
AIN-
3
AOUT
AOUT
4
GND
COMPIN+
5
COMPIN-
GND
6
VS
COMPIN-
7
COMPOUT
VS
8
VCC
COMPOUT
9
-
VCC
(SOP-8C)
Pin No.
Pin Function
Internal Equivalent Circuit Pin No.
Pin Function
1
AIN+
5
COMPIN-
2
AIN-
6
VS
3
AOUT
7
COMPOUT
Internal Equivalent Circuit
Flame Detection Amplifier MM1217
MITSUMI
Block Diagram
MM1217XF
MM1217XS
Absolute Maximum Ratings
(Ta=25°C)
Item
Symbol
Specification
Units
Storage temperature
TSTG
-40~+125
°C
Operating temperature
TOPR
-20~+75
°C
Power supply voltage
VCC max.
-0.3~+10
V
Input voltage
VIN
-0.3~+10
V
Allowable power dissipation
Pd
Electrical Characteristics
MM1217XF
300
MM1217XS
470
mW
(Unless otherwise specified Ta=25°C, VCC=3V, VIN=0V)
Item
Symbol
Current consumption
ICC
Reference voltage output current
IOVS1
0.3
Reference voltage
VS1
1.22
Reference voltage temperature drift
Measurement Conditions
Min. Typ. Max. Units
0.1
VS1
mA
1.27
1.32
V
ppm/°C
50
60
dB
3.0
PSRR
Power supply voltage range
VCC
1.8
Input voltage range
VI
-0.2
Input offset voltage
VIOA
temperature drift
mA
±100
Power supply line elimination ratio
Input offset voltage
f=100Hz
0.15
6.0
V
0.3
V
±0.1 ±0.35 mV
VIOA
±1.0
±3.0 µV/°C
Amplifier
Input offset current
IIOA
1
10
nA
section
Input bias current
IBA
50
150
nA
Gain
GV
RL=100kΩ
80
Output current
IOA
VIN=10mV, VO1=0.5V
0.5
Output voltage
VOA
VIN=-5~25mV
RL=10kΩ
0.01
100
dB
mA
VCC
-1.0
V
Flame Detection Amplifier MM1217
MITSUMI
Electrical Characteristics
Unless otherwise specified (Ta=25°C, VCC=3V, VIN=0V)
Item
Symbol
Measurement Conditions
VIOC
VIN=-5mV
±1.0
±3.5
VIOC
VIN=-5mV
±10
±30 µV/°C
Input bias current
IBC
VIN=-5mV
25
75
Output sink current
ISINK
VIN=10mV, VO2=0.4V
Output leak current
ILC
VO2=VCC+1V
Output saturation voltage
ISAT
VIN=10mV, ISINK=5mA
Input offset voltage
Input offset voltage
Comparator
Section
temperature drift
Min. Typ. Max. Units
5
mV
nA
mA
200
0.2
µA
400
mV
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.