06-09-2012, 04:55 PM
Interfacing to the Analog World
Analog World.ppt (Size: 3.98 MB / Downloads: 46)
Objectives
You should be able to:
Perform the basic calculations involved in the analysis of operational amplifier circuits.
Explain the operation of binary-weighted and R/2R digital-to-analog converters.
Make the external connections to a digital-to-analog IC to convert a numeric binary string into a proportional analog voltage.
Successive-Approximation Analog-to-Digital Conversion
Most used in modern ADC ICs
Converter circuit is similar to counter-ramp
Uses successive approximation register to quickly narrow in on the analog value
Result is a much faster conversion when compared to the counter-ramp method
Integrated-Circuit Analog-to-Digital Converters
ADC 0804
Successive-approximation
Two analog inputs for differential measurements
Internal clock (determined by external R and C)
Operation similar to NE5034
Analog and digital ground are both provided
Summary
Any analog quantity can be represented by a binary number. Longer binary numbers provide higher resolution, which gives a more accurate representation of the analog quantity.
The binary-weighted D/A converter is the simplest to construct, but it has practical limitations in resolution (number of input bits).
Operational amplifiers are important building blocks in analog-to-digital (A/D) and digital-to-analog (D/A) converters. They provide a means for summing currents at the input and converting a current to a voltage at the output of converter circuits.
The R/2R ladder D/A converter uses only two different resistor values, no matter how many binary input bits are included. This allows for very high resolution and ease of fabrication in integrated-circuit form.
Analog World.ppt (Size: 3.98 MB / Downloads: 46)
Objectives
You should be able to:
Perform the basic calculations involved in the analysis of operational amplifier circuits.
Explain the operation of binary-weighted and R/2R digital-to-analog converters.
Make the external connections to a digital-to-analog IC to convert a numeric binary string into a proportional analog voltage.
Successive-Approximation Analog-to-Digital Conversion
Most used in modern ADC ICs
Converter circuit is similar to counter-ramp
Uses successive approximation register to quickly narrow in on the analog value
Result is a much faster conversion when compared to the counter-ramp method
Integrated-Circuit Analog-to-Digital Converters
ADC 0804
Successive-approximation
Two analog inputs for differential measurements
Internal clock (determined by external R and C)
Operation similar to NE5034
Analog and digital ground are both provided
Summary
Any analog quantity can be represented by a binary number. Longer binary numbers provide higher resolution, which gives a more accurate representation of the analog quantity.
The binary-weighted D/A converter is the simplest to construct, but it has practical limitations in resolution (number of input bits).
Operational amplifiers are important building blocks in analog-to-digital (A/D) and digital-to-analog (D/A) converters. They provide a means for summing currents at the input and converting a current to a voltage at the output of converter circuits.
The R/2R ladder D/A converter uses only two different resistor values, no matter how many binary input bits are included. This allows for very high resolution and ease of fabrication in integrated-circuit form.