The DAC0800 series are monolithic 8-bit high-speed current-output digital-to-analog converters (DAC) featuring typical settling times of 100 ns. The DAC0800 series also features high compliance complementary current outputs to allow differential output voltages of 20 Vp-p with simple resistor loads as shown in Figure below
Features of DAC0800
• Fast settling output current: 100 ns
• Full scale error: ±1 LSB
• Nonlinearity over temperature: ±0.1%
• Full scale current drift: ±10 ppm/°C
• High output compliance: −10V to +18V
• Complementary current outputs
• Interface directly with TTL, CMOS, PMOS and others
• 2 quadrant wide range multiplying capability
• Wide power supply range: ±4.5V to ±18V
• Low power consumption: 33 mW at ±5V
• Low cost
analog voltage get amplified and isolated from the controller circuit hence the Opamp circuit is used to provide the compatibility with the alarming device. In our circuit we have used a speaker as an alarming device which is operable on 5V.
We have used the DAC to convert the digital data coming from the micro-controller to an analog alarming device, this is done by using an opamp 741 at the output of DAC so that the
analog voltage get amplified and isolated from the controller circuit hence the Opamp circuit is used to provide the compatibility with the alarming device. In our circuit we have used a speaker as an alarming device which is operable on 5V.
The DAC0800 provides high speed digital to analog conversion. When very low conversion rates can be used, another method of digital to analog conversion may suffice. Consider a square wave which is input to a low pass filter, whose cutoff frequency is far below the repetition rate of the square wave. From Fourier analysis, only the average value of the square wave should pass through the filter. By varying the duty cycle for the square wave, the average value o f the wave can be changed. Therefore, a low pass filter and the output compare functions can be used together to form a simple D/A converter for slowly varying signals.
Write a program that uses the low pass filter in Figure 2 as a D/A converter. Accept a voltage, between 0V and 5.0V, and use a 10KHz wave with variable duty cycle to produce the proper output voltage. The output compare functions should be used to generate the square wave. Measure Rref with an ohmmeter. Connect the circuit in Figure 1. Measure the voltage dropped across Vref and calculate IFS. Run the program for several voltages and analyze the results.
This is DAC0800 introduction .
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Features of DAC0800
• Fast settling output current: 100 ns
• Full scale error: ±1 LSB
• Nonlinearity over temperature: ±0.1%
• Full scale current drift: ±10 ppm/°C
• High output compliance: −10V to +18V
• Complementary current outputs
• Interface directly with TTL, CMOS, PMOS and others
• 2 quadrant wide range multiplying capability
• Wide power supply range: ±4.5V to ±18V
• Low power consumption: 33 mW at ±5V
• Low cost
analog voltage get amplified and isolated from the controller circuit hence the Opamp circuit is used to provide the compatibility with the alarming device. In our circuit we have used a speaker as an alarming device which is operable on 5V.
We have used the DAC to convert the digital data coming from the micro-controller to an analog alarming device, this is done by using an opamp 741 at the output of DAC so that the
The DAC0800 provides high speed digital to analog conversion. When very low conversion rates can be used, another method of digital to analog conversion may suffice. Consider a square wave which is input to a low pass filter, whose cutoff frequency is far below the repetition rate of the square wave. From Fourier analysis, only the average value of the square wave should pass through the filter. By varying the duty cycle for the square wave, the average value o f the wave can be changed. Therefore, a low pass filter and the output compare functions can be used together to form a simple D/A converter for slowly varying signals.
Write a program that uses the low pass filter in Figure 2 as a D/A converter. Accept a voltage, between 0V and 5.0V, and use a 10KHz wave with variable duty cycle to produce the proper output voltage. The output compare functions should be used to generate the square wave. Measure Rref with an ohmmeter. Connect the circuit in Figure 1. Measure the voltage dropped across Vref and calculate IFS. Run the program for several voltages and analyze the results.
This is DAC0800 introduction .
BACK to Content Page
. Next Page
. Previous Page
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