AK9240NK

Analog To Digital Converters (ADC) Overview

The AK9240NK is an Analog Front End (AFE) featuring dual 12-bit, 1MSPS SAR ADCs. It integrates a programmable gain amplifier (PGA) supporting selectable current or voltage input ranges, an LED driver with auto power control, and low-pass filters. The device operates on a 2.7V to 5.5V supply with typical power consumption of 17mA at 1MSPS. Key performance metrics include ±1.25LSB maximum INL, ±1.0LSB maximum DNL, and 71dB S/(N+D) at 10kHz input. It is housed in a compact 3mm x 3mm 20-pin QFN package.

Analog To Digital Converters (ADC) Feature Summary

• Dual simultaneous sampling 12-bit SAR ADCs with 1MSPS data rate
• Integrated PGA with selectable current/voltage input modes and adjustable gain
• Built-in LED driver with Auto Power Control (APC) and multiple operational modes
• Low noise performance: 71dB S/(N+D) typical at 10kHz input frequency

Analog To Digital Converters (ADC) Applications

• Compact optical encoders
• High-resolution position sensing systems
• Industrial automation sensors requiring integrated signal conditioning

Analog To Digital Converters (ADC) Procurement Notes

Verify the specific suffix 'NK' against the manufacturer's ordering guide to confirm package type and tape/reel specifications. Ensure compatibility with the required operating temperature range of -40°C to +105°C for industrial applications. Confirm that the 20-pin QFN footprint matches the design layout constraints.

Analog To Digital Converters (ADC) Selection Notes

Select this component when dual-channel simultaneous sampling is required within a single AFE package. The integrated LED driver simplifies designs for optical sensors by eliminating external drive circuitry. Consider the PGA gain settings and input mode (current vs. voltage) to match the sensor output characteristics directly to the ADC input range.

Analog To Digital Converters (ADC) Part Context

The AK9240 series is designed as a complete analog front-end solution, reducing board space and component count. The AK9240NK variant specifically denotes the 20-pin QFN package configuration. It consolidates amplification, filtering, conversion, and LED driving functions into one IC, targeting space-constrained embedded systems.

Analog To Digital Converters (ADC) Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Evaluate alternatives based on matching 12-bit resolution, 1MSPS speed, dual-channel architecture, and compatible QFN-20 packaging.

Analog To Digital Converters (ADC) FAQ

What is the maximum sampling rate of the AK9240NK?

The AK9240NK supports a maximum sampling rate of 1MSPS (1 million samples per second) for each of its two ADC channels.

Can the AK9240NK handle both current and voltage inputs?

Yes, the device features a programmable gain amplifier (PGA) that allows selection between current input mode and voltage input mode via register settings.

What is the purpose of the LEDREF pin?

The LEDREF pin serves as the reference voltage input for the integrated LED driver, particularly in APC (Auto Power Control) mode, where it helps regulate the LED drive current.