AK9822M

Digital To Analog Converters Overview

The AK9822M is a CMOS integrated circuit featuring an 8-bit, 2-channel digital-to-analog converter (DAC) with on-chip output buffer amplifiers and a non-volatile EEPROM memory section. The device stores input digital data for each DAC channel within the EEPROM, allowing it to retain settings during power loss. It operates with a wide VCC range of 1.8V to 5.5V for the EEPROM section and 2.7V to 5.5V for the DAC section. The component utilizes a serial interface compatible with one-chip microcomputers and includes features such as write protection, power-down modes, and an auto-read function upon power-up.

Digital To Analog Converters Feature Summary

• Integrated 128-word x 16-bit non-volatile CMOS EEPROM for persistent data storage
• Dual-channel 8-bit DAC with ±1.0 LSB DNL and ±1.5 LSB linearity error
• On-chip output buffer amplifiers supporting GND to VCC voltage ranges
• Serial communication interface with WRITE protection and Power Down functions

Digital To Analog Converters Applications

• Circuit adjustments for consumer equipment
• Circuit adjustments for industrial equipment
• Replacement for mechanical trimmers in calibration circuits

Digital To Analog Converters Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm the package type and temperature rating. The datasheet indicates the AK9822M corresponds to the -40°C to +85°C operating range in an 8-pin SSOP package. Ensure that the supply voltage requirements align with the distinct thresholds for the EEPROM (1.8V minimum) and DAC (2.7V minimum) sections before procurement.

Digital To Analog Converters Selection Notes

Select this component when a compact solution is required to replace mechanical potentiometers or trimmers in applications needing calibrated analog outputs. The dual-channel architecture allows independent control of two analog signals from a single serial interface. Consider the power consumption specifications, particularly the standby current of 1.0 µA in power-down mode, if battery life or low-power operation is a critical design constraint.

Digital To Analog Converters Part Context

The AK9822M belongs to the AK9822 series manufactured by Asahi Kasei Microdevices (AKM). It is designed as a general-purpose mixed-signal IC combining non-volatile memory with analog conversion capabilities. The 'M' suffix typically denotes the commercial temperature grade (-40°C to +85°C) and the specific SSOP-8 packaging configuration as listed in the manufacturer's ordering guide.

Digital To Analog Converters Replacement Considerations

When replacing this component, ensure the substitute supports the same 8-bit resolution and dual-channel architecture. Verify compatibility with the existing serial protocol (3-line negative clock synchronous interface) and check that the replacement offers similar write protection and power-down functionalities. Physical pinout compatibility with the 8-pin SSOP package must also be confirmed.

Digital To Analog Converters FAQ

How does the AUTO READ function operate upon power-up?

When VCC is applied and the CS pin is held low, the AK9822 automatically reads the content of the EEPROM and sets the outputs of the two DAC channels within 2ms. This function executes only once after power application.

What is the difference between the WRITE enable and disable states?

In the WRITE disable state, the WRITE instruction is invalid and ignored. The device powers up in this state. It transitions to the WRITE enable state only after receiving the WREN instruction, remaining enabled until WRDS is executed or power is removed.

How are the DAC outputs controlled via the CALL instruction?

The CALL instruction sets the DAC outputs using data from general purpose memory addresses 1 through 127. The upper 8 bits of the specified address set AO0, and the lower 8 bits set AO1. This instruction cannot be executed in power-down mode.