Piezo-electric device cut at a specific resonance frequency, mostly used in oscillators.

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1answer
47 views

how to select capacitor for a crystal oscillator

Here is a 32 MHz crystal from one of TI's reference design The BOM list defines the crystal as ...
1
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2answers
74 views

Is the value of XTAL load capacitors for ATmega328p @ 16MHz critical?

I'm going to try to assemble an MCU-based circuit using an ATmega328P-PU (Arduino UNO stripped down to essential parts as in this tutorial). I've skimmed over a lot of posts on EE.SE about load ...
16
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3answers
2k views

How does a Crystal work?

Specifically, a 2pin and 4pin quartz crystal oscillator. What I know: current is applied and the crystal oscillates in order to provide an oscillating signal. What I want to know: How does the ...
-1
votes
1answer
59 views

Improper functioning of Timer1 in pic18

I'm using pic18f controller and i am supposed to get a delay of 1 sec.I'm using an external crystal of 16mhz and this is the configuration bits that i have used in it.I have configured the timer1 and ...
1
vote
2answers
92 views

Can I share a crystal between two AT89S52? Is this method correct?

I have a project which I will need two 8051 microcontroller on a board. I want to reduce its size and cost, so I tried to use one crystal for two microcontroller, but just connect them parallel ...
2
votes
4answers
120 views

Electrostatic charge changes crystal frequency

What are the reasons of this undesired effect: I have a PIC with RTC (Real time clock) connected to an external 32.768kHz crystal for auto-calibration (according to PIC Manual handbook). The crystal ...
0
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0answers
41 views

Can you identify immersionRC transmitter crystal?

Please identify this crystal. It's from immersionRC 600mW video transmitter. Labeled S80003H. I have another one labeled S80009F from same brand transmitter 100mW, they are same, whats difference?
1
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1answer
52 views

If I'm using an RTC and ATMega328p (arduino UNO chip), do I need two crystals?

If I'm using an RTC that requires an external crystal, do I need a second external crystal for my ATMega328p? Or can the two share? What is standard practice for this kind of thing? I'm making a ...
0
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2answers
41 views

Crystal <--> CPLD interface

Could someone advise me on what would be a good practice to interface the CoolRunnerXC2C256 with an external clock? I wish to use KC5032A20 crystal and have it to drive global clock GCK2 (pin 38). ...
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1answer
60 views

Proper oscillator for CPLD

I plan to use KC5032A40 as a clock source for CoolRunnerXPLA3 256. I power it with 3.3V and interface it as suggested: I perform the measurement at the Test Point and do not add any CL capacitance, ...
4
votes
2answers
90 views

Why use asymmetrical capacitor values for crystal?

Are there any circumstances where you would want asymetrical load capacitors on a crystal? I came across this schematic in the documentation for an NXP UART. It looks just wrong to me. Can anyone tell ...
3
votes
1answer
212 views

Crystal oscillator wave shape?

I hooked up a crystal oscillator (4 pins) to Vcc + Gnd and observed the generated waveform using my scope. I think everyone will agree the waveform shown is very distorted and I am not sure why. Any ...
0
votes
1answer
94 views

Correct 4-pin Oscillator connections

I'm looking for the correct way to connect a 4-pin oscillator to a PIC24F. I have seen diagrams like the one below, but it seems that this connection is only for crystals and not crystal oscillators. ...
4
votes
2answers
411 views

What components are needed for a 20MHz square wave clock?

I would like to create a 20Mhz clock that generates a square wave for the home-brew Z80 computer I' making. I already have several 20MHz crystal oscillators but am at a loss when it comes to circuit ...
2
votes
0answers
46 views

Identifying Crystal Resonator Case Marking ('T' in a Diamond)

I have been trying for several hours to identify the manufacturer of a quartz resonator. There is a marking of a 'T' in a rhombus, like so: Does anybody know who's mark this is? I know that I've ...
6
votes
1answer
455 views

Choice of solder influencing quartz crystal?

I had problems with DS1307 based real time clocks, the culprit seems to be the solder we used. Let me explain. We were using an Adafruit DS1307 based RTC I2C ...
1
vote
1answer
73 views

Does the LPC1343 MCU need an external clock for USB operation?

I am trying to design a board using the LPC1343: http://www.nxp.com/documents/data_sheet/LPC1311_13_42_43.pdf I would like to be able to use its on-board USB bootloader to program it. My question is ...
0
votes
0answers
108 views

How to use a crystal oscillator

I am trying to use a crystal oscillator as a clock signal for the PWMCLK input of a LED driver chip (TC62D723FNG) I have a FOX 1813-0245 8926 25.00000 MHz crystal oscillator I picked up at a local ...
6
votes
1answer
155 views

PCB layout for 8-16MHz crystal very near WiFi module AND small DC motor

I'm designing an "Internet of Things" appliance where space and layout are constrained by mechanical and cost requirements. The main processor is a PIC18 and its crystal (probably 8MHz, maybe 16) is ...
1
vote
3answers
113 views

Load Resistor across Crystal

What is the purpose of using a 1M Ohm resistor across crystal pins? Please refer to the image for clarity. The crystal serves as the clock source for an USB Hub device(LAN9512). There is nothing ...
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votes
1answer
79 views

Will a 5V crystal oscillator oscillate with a 3.3V supply?

My question is in the title. I was looking for a component, but I can only find it with 5V. There is no data sheet provided so my question is in general: Will a 5V crystal oscillator oscillate with a ...
0
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0answers
59 views

Crystal oscillator output impedance

I want to build a varactor frequency tripler (from 80 to 240 MHz). Can't find XO output impedance for an input matching network. I would appreciate any advice on this matter.
5
votes
2answers
777 views

How to test a crystal resonator in board?

I have 2 quartz crystal resonators in my pcb board: 32.768 kHz & 20 MHz. They are connected to a Freescale MC12311 transceiver IC, which has an HCS08 micro-controller embedded in it. I want to ...
6
votes
3answers
507 views

How does this wireless transceiver work?

While messing with Arduino I came across this wireless transceiver. As a newbie in all this stuff, it's written that it operates at 2.4 GHz, so the transmitter crystal and receiver crystal must ...
0
votes
0answers
45 views

Can any one tell me the purpose of those two capacitors at the both end of XTAL1 and XTAL2 connected to crystal oscillator? [duplicate]

How does those two c2 and c1 capacitor affect clock input spectrum? What would happen if those two capacitors were not there? Are they mandatory to have?
0
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0answers
57 views

Difference between 3.3V half-size DIP oscillator and Full size DIP oscillator

I have often heard oscillators with 3.3V half-size DIP oscillator with 4 pins and Full-size DIP oscillator with 8 pins. Why would someone want to use half-size DIP or full size DIP?
0
votes
1answer
91 views

Any good suggestions for Basys2 optional oscillator 50 MHz or 100 MHz? [closed]

I want to get the optional stable oscillator for the Basys-2 but don't know which would be the best choice for 50 MHz and 100 MHz? Has anyone bought and used any? If so, what is the part number?
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0answers
55 views

Frequency modulation occurs not in an expected way

I've built this oscillator. Then I gave it a DC bias and connected an mp3 player. Result: I have local fm-stations muted at 90MHz, 90.75MHz and 89.25MHz. However, at 90MHz an mp3 music is very ...
2
votes
2answers
74 views

How does spread spectrum VCXO (voltage controlled oscillator improve EMI on your board?

I have seen people adding spread spectrum voltage controlled oscillator to EMI on the board, How is EMI affected by single spectrum crystal and with spread spectrum crystal.
1
vote
1answer
106 views

Crystals as RLC circuit? How?

What gives the crystal oscillator a property of Inductor? How does energy transformation between electrical field and mechanical stress and strain makes oscillator work like a Inductor? I know how ...
0
votes
1answer
105 views

ATtiny2313 accidental wrong fuse settings with crystal

I wanted to add external 12.000 MHz crystal to ATtiny2313. I connected it (both crystal pins to ground using 0.1μF capacitor) and flashed fuse bits. ...
0
votes
1answer
96 views

PIC:how can we operate PIC24FJ256GB106 controller to 32MHz internal frequency?

I am using below configuration bits for 32MHz internal frequency. _CONFIG2(IESO_OFF & FCKSM_CSECME & OSCIOFNC_ON & POSCMOD_NONE & FNOSC_FRCPLL) I know that FNOSC_FRCPLL give me ...
0
votes
1answer
117 views

Designing an Oscillator

I'm tired of having to resort to Google to find every single oscillator design. I would usually just try to search for a circuit using the same frequency crystal, and try to build that. Right now, I ...
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1answer
269 views

Determine polarity of crystal oscillator [closed]

A two-pinned 13.824 MHz crystal oscillator broke away from the pads on a PCB board. One pad is labeled + and the other is GND. Do two-pin crystal oscillators have specific polarity?
0
votes
1answer
77 views

What's the function the network outside a crystal oscillator connected to an IC?

Take a look at this: Then general network is commonly seen when connecting an oscillator to an IC. What is the purpose of this network? Is there an article I can read on it?
6
votes
1answer
142 views

Crystal oscillator in schematics

What the numbers 1 and 2 mean next to Crystal oscillator in hardware schematics? I tried to search online and went through about 20 lists with component symbols, but non had the numbers nor ...
5
votes
3answers
395 views

crystal oscillators connected in parallel

why there are two crystal oscillators connected in parallel in the circuit above? i am familiar with the configuration of Q2( look at the schematic) but what is the purpose of Q3? do i really need ...
4
votes
1answer
257 views

Crystal, PCB Layout

I've completed a few circuit board layouts before, however this is my first time doing a layout with a oscillator/MCU. After doing some reading (via this site and datasheets) I've come up with the ...
2
votes
1answer
70 views

Understanding crystal resonator symbols - which one is 24Mhz?

So, I'm in need of a 24MHz crystal to drive an AVR microcontroller. I've got some crystals that I've desoldered off some old, useless equipment. I've found three crystals that have '24' on their ...
7
votes
1answer
232 views

Radio Transmitter using Crystal Oscilliator

I am on the mission to control my RC car using arduino. The simplest way I thought of doing this is to add arduino outputs into the transmitter. Long story short I wanted to learn more about how these ...
2
votes
1answer
163 views

Using UART clock 3.6864 Mhz for a microcontroller

I want to use a 3.6864 MHz external oscillator to clock my ATMEGA328p to ensure 'error free' serial communication. When I looked at this page, I see that 3.68464MHz is also represented as 2*1.8432 ...
0
votes
4answers
600 views

Run an atmega328 only using an 16Mhz crystal without caps

Can you run an ATmega328 only using an 16Mhz crystal, so without the capacitors?
5
votes
2answers
208 views

Can a wrong crystal oscilator capacitor burn the MCU?

Short story: I am using an Atmel AT32UC3C2512C MCU and I selected a 20MHz crystal oscillator for it and two NP0 10pF capacitors. I was in doubt between 10pF, 15pF or 22pF, so I decided to start with ...
18
votes
1answer
565 views

What effect does selecting the wrong load capacitance for a crystal have?

I've seen questions such as this one and this one that talk about selecting capacitors that, in series, match up as closely as possible to the load capacitance of the crystal. What effect does ...
2
votes
1answer
103 views

4-pin quartz resonators - shall the 2 ground pins be connected to ground plane of the pcb?

I am about to use a 8MHz quartz resonator that has 4 pins (http://datasheet.octopart.com/LF-XTAL026380.-IQD-Frequency-Products-datasheet-6993.pdf): pin 1 and 3 are connected to resonator while pins 2 ...
2
votes
1answer
141 views

Why do the satellite manufacturing companies themselves make their crystals?

Yesterday, I saw this documentary>How To Build A Satellite(look this intervals->27:29 - 30:16) and after see it, I had a question but I couldn't find any answer for it. my question is this: Why do ...
4
votes
1answer
131 views

Chosing XTAL Capacitors for Microcontroller

I am trying to chose the parallel capacitors for the crystal on my micro-controller. The crystal is a 9.6MHz quartz crystal (chosen because 9.6MHz is good for UART communication). Going through the ...
3
votes
2answers
531 views

How is Crystal Oscillator implemented in digital circuit to generate clock frequency. What part of crystal oscillator makes the clock signal?

How is Crystal Oscillator implemented in digital circuit to generate clock frequency? What part of crystal oscillator makes the clock signal? I know the fact that crystals has its resonating ...
6
votes
4answers
1k views

How can I measure the frequency of a watch crystal using my oscilloscope?

I am trying to measure the frequency of a 32.768 kHz watch crystal which is connected to my AVR MCU. This is so that I can fine-tune the crystal's capacitor values to get a correct frequency. However, ...
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0answers
153 views

NE602 local oscillator

I'm making experiments with simple SA602 (formerly NE602) chip to educate myself build radio circuits. I started with local oscillator circuit. I used a 10 Mhz crystal. It oscillates at that ...