LED driver built-in AFEICs
for NDIR Gas Sensing

LED Driver with Built-in AFE (analog front end) IC
Optimized for NDIR Type Gas Sensor

AK9721AE

The AK9721AE provides a signal processing solution for NDIR type gas sensor applications by combining AKM's infrared light emitting/receiving element and an external MCU. The light emitting element (IR - LED) driver is a programmable constant current circuit, and it is controlled optimally according to the optical path length of the gas sensor. The signal of the light receiving element (IR sensor) is amplified by a programmable gain amplifier and then AD converted in 24-bit resolution. Settings of each block are done by the external MCU via the I2C bus.

● Programmable change of AFE gain and constant current driving condition of light-emitting diode

● Low current consumption
Typ. 8.1μA (Integration time:100μs, Measurement time: 149ms)

● Small plastic package
16-pin QFN (3.0mm x 3.0mm x 0.7mm)

● Automotive grade: AK9723AD

Lineup

LED driver built-in AFEICs for NDIR Gas Sensing

Part Number
Part Status
LED Drive Current
[mA]
ADC Resolution
[bit]
Power Supply 
Voltage (MIN.)
[V]
Power Supply 
Voltage (TYP.)
[V]
Power Supply 
Voltage (MAX.)
[V]
Package Size
[mm]
Other
Operating Temperature [℃]
Device Package
Number of Pins
AK9723AJ
NEW
28 - 121 Programmable (3mA Step)
13
2.7

                                
3.6
4.0 x 4.0 x 0.7

                                
-40 to 85
HWQFN
16
AK9723AD
MP
28 -121 Programmable (3mA Step)
13
2.7

                                
3.6
4.0 x 4.0 x 0.7
Automotive grade
-40 to 90
HWQFN
16
AK9721AE
MP
28 - 121 Programmable (3mA Step)
24
2.7

                                
3.6
3.0 x 3.0 x 0.7

                                
-40 to 90
HWQFN
16
AK9724AE
NEW
28 - 121 Programmable (3mA Step)
13
2.7

                                
3.6
3.0 x 3.0 x 0.7

                                
-40 to 90
HWQFN
16