Page 256 - DCAP108_DIGITAL_CIRCUITS_AND_LOGIC_DESIGNS

Unit 12: A/D and D/A Converters

Sentrix tracking units are typically worn under users’ uniforms, and are ruggedized to Notes
withstand high body heat and environmental temperature. Where the performance of
competing sensors is compromised under these conditions, ADI’s ADIS16365 inertial sensors
are designed to sustain consistent operation in temperatures up to 105 degrees.
ADI’s integration of multiple axis of accelerometer and gyroscope in a single package enabled
TRX’s design team to conserve valuable board space and achieve a highly compact form
factor so as not to impede users’ agility in the field. ADIS16365 inertial sensors also help to
minimize power consumption, ensuring that users can work a full 8+ hour shift between
systems re-charges.

Questions:
1. Explain the working of Sentrix tracking system.
2. What do you understand by Global Positioning System (GPS) technology?

Self Assessment

Choose the correct answer:
6. Process of converting an analog voltage into an equivalent digital signal is known as................
(a) analog-to-digital (A/D) (b) digital-to-analog (D/A)
(c) Both (d) None of these
7. The simultaneous method of A/D conversion is based on the use of a number of .............
(a) single circuit (b) complete circuit
(c) integrator circuit (d) comparator circuit
8. If you pay close attention, you will see that it is very similar to a ramp counter ADC.

(a) True (b) False
9. Flash converter is called the ..............
(a) single-slope (b) parallel A/D converter
(c) A/D converter (d) dual-slope
10. Signals in the real world are .............
(a) serial (b) parallel
(c) digital (d) analog

12.14 Summary

• Resistive divider that performs these functions is resistors R0, R1 and R2 form the divider
network resistance RL represents the load to which the dividers connected and is considered
to be large enough that it does not load the divider network.
• The total resistance looking out toward the 20 input is also 2R; these two resistors can be
combined to form an equivalent resistor of value R.
• The steady-state accuracy test involves setting a known digital number in the input register,
measuring the analog output with an accurate meter, and comparing with the theoretical
value
• D/A converter is primarily a function of the accuracy of the precision resistors used in the
ladder and the precision of the reference voltage supply used. Accuracy is a measure of
how close the actual output voltage is to the theoretical output value.

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