News Release

- New Product Information -


AKM releases a 16-bit 1.1MHz analog front end IC with PGA, the AK9242 accomplishes high resolution for small industrial motor systems

Product Name
Product Category:
Industrial LSI> Industrial AFEs&ADCs
AK9242NK: 16-bit 1.1MHz 2ch Industrial AFE
(TIA[*1] / Instrumentation Amplifier Selectable, Integrated PGA [*2],
Offset / Gain / Phase Compensation Functions, Polar Coordinate Output Format)

[*1] TIA: Trans Impedance Amplifier
[*2] PGA: Programmable Gain Amplifier

Motor Control Encoders, Current Meters, Other Small Meters


Recently, the increasing popularity of robotic applications has driven demand to minimize PCB size, and thus shrink motor size.
Asahi Kasei Microdevices Corporation, (AKM), has now released the AK9242NK, a high-resolution analog front end, (AFE), with A/D converter. It includes various calculation functions and circuits such as the added PGA. The AK9242NK also has an instrumentation amplifier and TIA, enabling the selection of magnetic or optical encoder inputs. Input range can be changed according to the system with the integrated PGAs. The AK9242NK is housed in a small 4mm x 4mm QFN package. The AK9242NK is suitable for a compact, high accuracy, and versatile systems. In addition, AKM has made available the AK9240NK, a 12-bit version of the AK9242NK. The AK9240NK is packaged in an ultra-small 3mm x 3mm QFN package. A 14-bit version, the AK9243NK, is under development.


● TIA / Instrumentation Amplifier

The AK9242NK, AK9243NK, AK9240NK integrates an instrumentation amplifier, enabling to connect a voltage output sensor directly. A current output sensor can also be connected directly since the AK9242NK, AK9243NK, AK9240NK has trans impedance amplifiers (TIA). This reduces analog circuit design time.

Figure 1. General Photo-IC
Figure 2. AK9242NK, AK9243NK
Figure 3. AK9240NK

[*3] APC: Automatic Power Control

● Integrated PGA

The AK9242NK, AK9243NK, AK9240NK has PGAs and the input range can be changed according to the systems. The specified characteristics in the datasheet are with a high gain setting, so the noise characteristics of the system can be easily improved.

● Small Package

The AK9242NK, AK9243NK adopts a 24-pin 4mm x 4mm small QFN package.

● Offset / Gain / Phase Adjustment Function

Offset, gain, and phase adjustments for the converted signal are available for each channel independently with the AK9242NK, AK9243NK minimizing the need for external processing.

● Polar Coordinate Output Function

The AK9242NK, AK9243NK is capable of a polar coordinate output, (angle, "θ", moving radius, "r"), when cosine and sine waves are input to CH0 and CH1, respectively. This results in simultaneous conversion of the input signals of CH0 and CH1. At minimum, it takes 3μsec to output the data after sampling, which includes angle calculation.

Figure 4. Relationship of Polar Coordinates and Each Channel Input
Figure 5. Polar Coordinates with Ideal Full Inputs


Product Name AK9242NK
ZDS[*4] A/D Converter
ZDS A/D Converter
SAR A/D Converter
Sampling Rate1.1 MSPS1.1 MSPS1.0 MSPS
CH Number2 ch2 ch2 ch
DNL (min.~max.)-1.0 ~ +2.0 LSB-1.0 ~ +1.0 LSB -1.0 ~ +1.0 LSB
INL (min.~max.)-8.0 ~ +8.0 LSB-2.0 ~ +2.0 LSB -1.25 ~ +1.25 LSB
S/(N+S) (typ.)82dB80dB71dB
S/N (typ.)82dB80dB72dB
THD (typ.)-94dB-94dB-80dB
Integrated Parts & FunctionsCurrent / Voltage Input Selectable
2 steps Band Limiting Filter
Integrated PGA
Polar Coordinate Output Format
Digital Offset / Gain / Phase Error Compensation
0ch / 1ch Serial Output Mode
Current / Voltage Input Selectable
2 steps Band Limiting Filter
Integrated PGA
LED Driver/
Automatic Power Control Circuit[*5]
Power SupplyVDD: 4.2 to 5.5V
DRVDD: 2.7 to 5.5V
VDD: 2.7 to 5.5V
DRVDD: 2.7 to 5.5V
Current Consumption (typ.)104mA17mA
Operation Temperature-40 to 105°C
Package24-pin QFN 4 x 4mm
(pin pitch 0.5mm)
20-pin QFN 3 x 3mm
(pin pitch 0.5mm)
ScheduleSample Available-CY2018/Q3Available
Mass ProductAvailableCY2018/Q4CY2018/Q1
[*4] ZDS: Zero Latency Delta Sigma ADC
[*5] LED Driver / Automatic Power Control Circuit

The AK9240NK has an LED driver for optical systems. LEDs can be connected directly. Signal amplitude variations caused by temperature characteristics, length of optical path and age deterioration of LEDs can be suppressed with automatic power control. APC function is only available with TIA.

* Information on this page is current on the date of press release.
* AKM is trademark of Asahi Kasei Microdevices Corporation in Japan, Europe and the United States.
* Appellations, company names and product names on this page are trademarks or registered trademarks of respective companies.

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