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Computer Controlled Teaching Unit for the Study of Analog/Digital and Digital/Analog Converters


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Used for the Study of Analog/Digital and Digital/Analog Converters. It covers the basic principles about analog to digital converters and digital to analog converters, and allows to displaying the results on the computer.

1.      CADDA. Unit:

Metallic box.

Diagram in the front panel with similar distribution to the elements in the real unit.

In this unit, the elements are separated in two parts: lefthand part for analog to digital conversions, and right

hand part for digital to analog conversions.

Analog/Digital converter board. Digital/Analog converter board.

Signal generator board, with 100 to 330 mF capacitors, 10 to 50K potentiometers and 1 to 100K resistors.

Female and male connectors, interconnections.

Power supply.

LPF-Low Pass Filter: 2nd order low pass filter, needed to convert analog signals to digital.

Adding: this module makes sum of two analog signals.

Sample/Hold: this module holds the signal during the conversion. The input is E, and the output is S. The digital S/H

control input defines the operation mode: hold or sample.

Comparator: inputs E+ and E- are compared, and give the result in the digital output S: if E+>E-, S will be at

high level. The gate OR inverts the input IN, to finally give the result of bit operation OUT=S+NOT (IN).

Clock: this module generates two digital clocks, CLK1 (245 Hz) and CLK2 (250 kHz).

Analog switch: by the control input C, two connections can be switched to a common point. If C='0', pin 0 is connected

at common pin. Also, pin 1 is connected to common point. In this way, we can select one or other analog signal.

Ramp: this module generates a ramp, after reset pulse.

A/D control: this module generates the digital commands needed to carry out the A/D practice selected by the PC.

D/A: this module includes an integrated digital to analog converter. The conversion is quasi instantaneous (85 ns). The

factor of conversion can be modified by the potentiometer. Analog output is S, and digital inputs, Most Significant Bit

(MSB) to Least Significant Bit (LSB), can be controlled by PC.

A/D: this module contains an integrated analog to digital converter. The chip used, with track and hold included,

is useful: by putting a digital negative transition at pin CONV, the analog signal E is internally sampled

and converted, in 660ns. During conversion time, EOC takes high state, but becames low at end of

conversion. At this time, PC can read output port, MSB to LSB.

Counter: this module is a 8 bit reversible and clocked counter.

Waveform generator: this module delivers different voltages needed by unit.

D/C: Two continuous voltage output: `-5V´ and `+5V.´ Two adjustable voltage output: `variable´-`5V´, and `5V´,

everyone with its potentiometer to adjust voltage by 0 to -5.5V for first, and by 0 to 5.5V for second.

AC: three different waveform: sine, triangular and square, adjustable in frequency and width.

Analog switches: 8 analog switches. All are managed by a PC.

Weighted resistors: 8 resistances are connected to a common point. They are weighted as binary code, with R=1KW

as initial value.

D/A: same module than described before “D/A”.

Analog input and output for PC.

Serial lock 1: module based on an adding inverter, but became an analog memory by included commuting switch.

Adding: same module as previously described ”Adding”.

Serial lock 2: same module than serial lock 1, but based only on an inverter.

R/2R: stair of resistance R/2R.

Potentiometer: a single potentiometer, variable from 0 to 10 K .

D/A control: this module generates the digital commands needed to realise D/A practice selected by PC.

Operational amplifier: a simple powered operational amplifier.

Two capacities of 100nF with common connection.

Sample/Hold: same module as previously described “Sample/Hold”.

Control Interface.

2.        DAB. Data Acquisition Board:

PCI Data acquisition board (National Instruments) to be placed in a computer slot. Bus PCI.

Analog input: Channels= 16 single-ended or 8 differential. Resolution=16 bits, 1 in 65536.

Sampling rate up to: 250 KS/s (Kilo samples per second). Input range (V)= 10V.

Data transfers=DMA, interrupts, programmed I/0. Number of DMA channels=6.

Analog output:Channels=2. Resolution=16 bits, 1 in 65536. Maximum output rate up to: 833 KS/s.

Output range(V)= 10V. Data transfers=DMA, interrupts, programmed I/0.

Digital Input/Output: Channels=24 inputs/outputs. D0 or DI Sample Clock frequency: 0 to 1 MHz.

Timing: Counter/timers=2. Resolution: Counter/timers: 32 bits.

3.        CADDA/CCSOF. Computer Control+Data Acquisition+Data Management Software:

Compatible with all actual Windows operating systems. Graphic and intuitive simulation of the process in screen. Compatible with the industry standards.

Registration and visualization of all process variables in an automatic and simultaneously way.

Flexible open and multicontrol software, developed with actual windows graphic systems, acting simultaneously  on all process parameters. Management, processing, comparison and storage of data. Sampling velocity up to 250,000 data per second. Comparative analysis of the obtained data, after to the process and modification of the conditions during the process.

4.        Cables and Accessories, for normal operation.

5.        Manuals:

This unit is supplied with 8 manuals: Required Services, Assembly and Installation, Interface and Control Software, Starting-up, Safety, Maintenance, Calibration &Practices Manuals.