AD7228LPZ

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The AD7228LPZ, a device from Analog Devices that falls in the category of Data Acquisition - Digital To Analog Converters (DACs), is an eight channel, 25-bit DAC that operates with a wide voltage range (1.7V to 5.5V). It is used to convert digital signals into analog voltages. With an on-chip temperature range of -40C to +125C, the AD7228LPZ is often used in applications that require extreme temperature operation.

The AD7228LPZ is a low powered device with a minimum current draw of 5 mA. It features an SPI™-compatible Serial Peripheral Interface (SPI) that can be used to configure the device and transfer data from the digital control unit to the DAC. Moreover, it supports power-saving modes that reduce total power consumption.

The application field of the AD7228LPZ can vary from consumer electronics, automotive, industrial automation, medical instruments, instrumentation and more. Industrial automation equipment such as Programmable Logic Controllers (PLCs) and Frequency Converters may require the use of DACs, and the AD7228LPZ would be an ideal choice.

The working principle of the AD7228LPZ is simple. The digital data is sent to the input of the sequencer. Depending on the input, the control logic configures the data path to the spark logic. The spark logic then services the converters, charging the G1 and G0 capacitors. After the capacitors settle the output is given.

The two G1 and G0 capacitors represent the two ports of the resistor ladder. The value of the G1 capacitor determines how close the output voltage will be to the reference voltage. The G0 capacitor is linked to the output source because when a charge is applied to it, it influences the output. If a constant voltage from the reference source is used, then the G0 should be tied to it besides the signal.

The output voltage of the converter is determined by the number of bits the data has. The device uses the charge redistribution technique, meaning the current flows through the resistor ladder, through the G1 and G0 capacitors, then to ground. The voltage is then determined by which capacitors have accumulated charge and by the size of the converter bits.

In conclusion, DACs are used in applications where a digital signal needs to be converted into an analogue voltage. The AD7228LPZ is an eight-channel, Voltage Output, 25-bit DAC operating with a wide voltage range (1.7 V to 5.5 V) and a low power consumption with a single supply of 5 mA; which makes it suitable for applications that require extreme temperature operation. The AD7228LPZ works according to the charge-redistribution technique and the voltage is determined by the number of bits of data sent to it.

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