Digital to Analog Converters are essential to the electronics market. They are used in almost every piece of electronic equipment which involves interaction with an external world. Whether it be mere LED blinking (LED dimming) or complex voice translators, DACs are important. DAC7715 provides a four-channel output and takes 12-bit serial input. It has a good resolution of 12-bits and can sink up to 5 mA of current. It contains a selectable Reset that combines with asynchronous clear registers and sets them to either zero-scale or midscale. For protection purposes, it has an ESD protection circuit.
The pinout of the DAC7715 Digital to Analog Converter IC is shown below:
Features of DAC0832
- The controller or any low voltage device can supply the DAC0832 with 8-bit digital data.
- The DAC0832 may be run with the one power supply.
- No specific gadget is needed to interact with a microcontroller. It might be fastened directly.
- You can use a logic gate to control the DAC0832. It is not reliant on a microprocessor or microcontroller of any kind.
- With DAC0832, every CMOS and TTL device is compatible.
- It can be used for voltage switching.
- Both SOIC and PLCC with all 20 pins are available packaging options.
- The DAC can function with 10 voltage references.
- Only full scale and zero adjustment are used to specify its linearity. For straight-line fit, it is not the finest.
- The interchangeability and complete compatibility of DAC0832
Specifications of DAC
- It has 1us of current settling time.
- It has a voltage range of 5 – 15 DC Volts.
- DAC0832 has a low power consumption range of 20mW.
- Maximum power dissipation of DAC is 500mW
- The operating temperature of DAC is 0 to +75 degrees centigrade.
- It only works with 8-bit digital input data.
How to generate an analog signal with DAC0832
It comes in two different packages, each with 20 pins: SOIC and PLCC.
The internal structure of DAC0832 is straightforward. An AND gate and a NAND gate in the DAC regulate the input register, which has received the 8-bit data. Three input signals—CS, WR1, and ILE—will be provided to the AND & NAND gate combination. Data is transferred from the input register to the 8-bit DAC register when CS and WR1 become LOW and ILE becomes HIGH. Data is controlled by a NAND gate, which receives input from two pins, WR2 and XFER, after being transferred into the DAC register.
Data in the DAC Register can be replaced with information from the preceding input register and then sent to the DAC Converter. The data in a DAC converter will be split into two outputs. The output is going to be called the current output. The output will be in the form of a current, which will then be converted to a voltage using a TTL circuit and an RFB pin.
Working of DAC0832
All 5 control pins must be under our control for the DAC to function properly. To activate the DAC, the Pin ILE must be HIGH and the CS, WR1, WR2, and XFER control pins must all be LOW. To specify the maximum output and input voltages, the power will be connected to the VREF pin. The voltages must then be converted to current using an OP-AMP circuit. The circuit we’ll use is shown here.
The DC0832 will be connected to the output pin that is connected to the LM358 OP AMP. A 60-ohm resistor will be used to link the Output to the RFB pin. The resistor’s value will vary depending on the circuit. The power supplied on VREF will be equal to the output voltage. In VREF, the MAX output voltage is described. The OPAMP will also convert voltage to current. Because it will also raise the voltage level at the OP-output AMP’s pin, the resistor will be used to measure the voltages precisely. The VCC pin will receive the voltage, and the GN pin will receive ground. Except for ILE, the Controls pin will be grounded.
Example to convert digital into analog with DAC0832
As an example, we will convert the digital signal to voltages. The digital signal will be input through the digital pins in 8-bits and they will give the output in voltage which will be detectable through any dc voltmeter. The lowest input value on digital pins will be “00000000” and the maximum input value will be “11111111”.
Converting low logic to analog low signal
When we provide the lowest value as an input, it will change the value to 0, but when we provide the highest value as an input, the output will be the highest voltages of the VREF pins. The data will be regarded as having the maximum output because all pins are HIGH. Because IC cannot comprehend how to translate binary to analogue data, it will provide us with the output by taking VREF into account. Create the following circuit in your proteus programme to accomplish this.
Converting digital high logic to analog high signal
To make the circuit above understandable for all types of microcontrollers, logic gates will be used. The output is 0V when low logic is applied to all digital pins. Now try setting all digital pins to HIGH.
You may notice that when we apply all HIGH logics then output is 5 volts, which is equal to VREF voltages. The output voltages were more than 5V due to the use of OP-AMP conversion. To make it perfect a 60-ohm resistor is used to make the output equal to 5Volt. The size of the resistor will be dependent every time on the power of OP AMP. The value of voltages varies for different powers. The output of multiple DAC0832 can be used for multiple outputs. Then we will need to control the CS pin to make the usage of specific IC at a specific time.
DAC0832 Proteus Simulation
In this simulation, we give a digital input signal with 74LS393 counter and you can see the analog output on digital dc voltmeter.