AD7569BQ

Series:	LC²MOS
Packaging:	Tube
Part Status:	Active
Applications:	Analog I/O
Interface:	Bus
Voltage - Supply:	4.75 V ~ 5.25 V
Package / Case:	24-CDIP (0.300", 7.62mm)
Supplier Device Package:	24-CDIP
Mounting Type:	Through Hole
Base Part Number:	AD7569

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AD7569BQ Application Field and Working Principle

The AD7569BQ is a 9-bit nonlinear sigma delta digital-to-analog converter (DAC) designed with a focusing on performance and versatility. It supports current or voltage output levels with resistor-programmed ranges. This makes the AD7569BQ an ideal device for industrial and high-level automation applications that require a combination of accuracy, speed, and low current consumption.The AD7569BQ has a wide range of applications, from power conversion to signal conditioning, instrumentation, and several other industrial applications as well. Its versatile design makes it an ideal DAC for systems that require high performance, small size, low power consumption, and high flexibility.

Input Structure

The AD7569BQ accepts 8-bit parallel data, as well as Serial Peripheral Interface (SPI) and Inter-Integrated Circuit (I2C). It supports both single-ended and differential input structures. It has a 9-bit resolution which enables the system to achieve higher accuracy than traditional DACs with a lower resolution. Additionally, it has sampling and consolidation features that enables multiple 8-bit words to be aggregated and stored for batch conversion that is essential for many industrial applications.

Output Structure

The AD7569BQ has two outputs, either a current or voltage-mode output configuration. The current-mode output structure includes two pins, VCOM and VOUT. VCOM is the common output between the two and VOUT is the programmable output that is connected to the output voltage or output current. The voltage-mode output structure is designed to provide an adjustable reference voltage, VREF, which is connected to an external resistor ladder to provide a scaling factor to the output. This allows the user to program the output within a certain range.

Function Blocks

The AD7569BQ has several functional blocks which are used to provide the desired behavior. It has an input register, control block, reference voltage generator, digital-to-analog converter, consolidation register, and output amplifier. The input register is used to store 8-bit words for batch conversions. The control block is responsible for setting up the operating mode and settings for the DAC. The reference voltage generator provides the voltage required for the voltage output configuration. The digital-to-analog converter is responsible for converting the incoming digital data into an analog voltage or current output. The consolidation register is used for aggregating multiple 8-bit words for batch conversions. The output amplifier is the last functional block in the DAC and is responsible for driving the analog output signal.

Working Principle

The AD7569BQ converts digital data into an analog signal through a sigma-delta modulation process. It first converts the 8-bit input data into a 2’s complement 9-bit code using the input register block and then converts the 9-bit code into a variable voltage or current output using the digital-to-analog converter block. The output signal is then amplified using the output amplifier. The consolidated register is used to aggregate multiple 8-bit words to allow for batch conversions.

Conclusion

The AD7569BQ is a versatile 9-bit nonlinear sigma delta digital-to-analog converter (DAC) designed to meet the requirements of a wide range of applications from industrial and high-level automation applications. Its input structure supports 8-bit parallel data, SPI, and I2C while its output can be configured as either a current or voltage-mode output. Its functional blocks include an input register, control block, reference voltage generator, digital-to-analog converter, consolidation register, and output amplifier. The AD7569BQ converts digital data into an analog signal through a sigma-delta modulation process that is enabled by the functional blocks.

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