The XR is a monolithic function generator integrated circuit capable of producing high quality sine, square, triangle, ramp, and pulse waveforms. This laboratory exercise will use the XR monolithic IC function generator. The manufacturer’s data sheet to analyze the requirements to set the frequency . The low-cost IC XR provides a very simple function generator with only a few external components. XR data sheet provides complete basic circuit for a.
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The XR has some interesting features that illustrate some of the topics mentioned in this page, so let’s examine this chip.
XR2206 Function Generator
Headphone amplifier is small enough to fit in Altoids tin box, and thanks to low power consumption may datashret supplied from a single 9V battery. All required circuit details are shown in the datasheet.
Feed Y and the XR with a triangle wave, and X by the rectified voltage across the tuned circuit. Pins 7 and 8 are held at 3 V, and more than 3 mA should not be drawn from them, so 1k is the minimum timing resistor. The output can be buffered to adjust its DC component and signal amplitude.
It’s small, power efficient, yet customizable through onboard 2 x 7 perfboard that can be used for connecting various sensors and connectors.
The capacitor C and the power to determine the frequency at pin 7. The actual sample structure differs in some xr206 from the data sheet. The circuit includes an auto ranging as well as reset switch and produces very accurate and stable readings. It is an irreplaceable tool for troubleshooting and repairing electronic equipment by determining performance and health of electrolytic capacitors. R is rx2206 normal timing resisor, while RC handles the xxr2206 current.
With the frequency-determining capacitor of 0. I found 10k and 0. Modulating the frequency with an external dataxheet has quite a few applications. Although this is an analogue IC, this project just made it into the Arduino section of my website because it uses an ATmega as a frequency counter and to drive an 8-digit 0.
The output was centered on 6. With a pot of 2 megohms and a fixed resistor of 1 kOhm variation gives a ratio of 1 to and may include a range of 10 Hz to 20 kHz sweep. Reducing R to 2k gave an ideal 20 ms period, or 50 Hz. The proper adjustment of these controls is necessary for a good-looking sine wave.
Function Generator with XR2206
The amplitude setting at pin 3 is connected with fixed resistors, so the output voltage is always the same. But there are some points that could improve it take to build an almost professional function generator. Headphone amplifier is small enough to fit in Altoids tin box, and thanks to low power consumption may be supplied from a single 9V battery.
Frequency can be varied by a range switch and xt2206 potentiometer, so that one could make a fairly useful function generator based on this chip, at low cost. It can be connected to any type of stereo dtaasheet source such dr2206 iPod, Computer, Laptop, CD Player, Walkman, Television, Satellite Receiver, Tape Deck or other stereo system to transmit stereo datassheet with excellent clarity throughout your home, office, yard or camp ground.
It can be connected to any type of stereo audio source such as iPod, Computer, Laptop, CD Player, Walkman, Television, Satellite Receiver, Tape Deck or other stereo system to transmit stereo sound with excellent clarity throughout your home, office, yard or camp ground.
XR Datasheet(PDF) – Exar Corporation
XR data sheet provides complete basic circuit for a simple function generator. I used modulation at 1. This gives easy frequency-shift keying FSK by a logic input to pin 9. FM would also be good catasheet testing a phase-locked loop. Arduino Prototype uses all standard through-hole components for easy construction, two of which are hidden underneath IC socket.
The frequency is set by a capacitor, in the range 0. Use a buffered potentiometer to test the dependence of frequency on VC.
Frequency control The frequency range is controlled with the timing capacitor connected between pins 5 and 6 of the XR and the timing resistors VR1, VR2 and R2 conencted in series between pin 7 and v. It can produce a triangle wave, but this is really just a step towards the sine wave, and is seldom required.
When pin 9 is open or above 2 V, the resistor called R1 is used. Although I’ve seen circuits and even commercial project kits claiming several Dataseet frequency range, in satasheet I think somewhere around kHz or kHz maximum frequency is more realistic for these ICs while still maintaining a reasonably low-distortion sine waveform.
With the component values shown above, the overlapping frequency ranges are shown in the following table: Although neither chip is in current production, both are still widely available – either as old stock or, perhaps, as ‘clones’. The overlapping of the ranges isn’t ideal but it hasn’t proven to be a problem in practice. Instead of the sine wave output is obtained after opening of S1 a triangular output wave.
The frequency is changed by using a variable resistor. The DC bias at this input is necessary, and the signal amplitude must be properly adjusted. One could make a small AM radio transmitter with this chip for use over short distances. If the applied voltage V is 3. The kHz signal could be picked up on an AM radio at the expected frequency, and the modulation heard.
On the board, the outputs of the circuit were placed in small wire loops, where the signals can be picked up directly with alligator clips. One is displaying frequency response on the scope–you might try this with a parallel resonant circuit.
In any case, do not exceed 3 mA from pin 7 or 8.