Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [tcxo]

15 questions
4
votes
2 answers

Generating a 1pps signal with ~0.1ppm accuracy

Firstly I just want to say I have next to 0 electronics knowledge so if I say something dumb I apologize. I am wanting to make a device which outputs a 1 pps square wave signal that is highly accurate over the course of 60 mins. I don't want the…
Lachlan
  • 43
  • 6
4
votes
1 answer

Crystal vs External Clock Source

In general (and maybe this is impossible to answer "generally"), is it possible to supply an external clock source to a microprocessor that supports a directly-connected crystal (and a pair of small caps)? Specifically, I'm looking at an ESP32,…
eric
  • 351
  • 3
  • 13
2
votes
2 answers

Issue for TCXO through frequency multiplier (PLL) for STM32 I2S signal

I try to use TCXO (KT7050A24576KAW33TAD) at 24.576 MHz through frequency multiplier (PLL) x4 (NB3N511DG) to clock the I2S bus (SAI domain) at 98.304 MHz on a MCU (STM32L4R5VIT6). Signals are not what I expected. Can someone help me to understand…
rom1nux
  • 498
  • 3
  • 18
2
votes
1 answer

Can the output of a TCXO drive a LPC1114 uC?

Is it possible to drive the on-chip oscillator of LPC1114FN28 using the clock output of a FOX924B TCXO? The Datasheet of the uC indicates that a 100 pF cap needs to be put between the oscillator and the XTALIN pin with an additional cap connected to…
Abhishek
  • 409
  • 5
  • 11
1
vote
2 answers

DS3231 Precision Set Time

How does one set the DS3231 with microsecond precision? I2C doesn't really seem to lend itself to precision. My guess is that the RST pin is used, but I can't seem to decipher spec PDF's description of it. And it too seems like it might imprecise if…
NewEndian
  • 111
  • 2
1
vote
1 answer

Measuring Allan Variance

I have some microcontrollers with TCXO's where I wish to measure their frequency stability using Allan variance (from say 1ms to 10s). However, my measurement equipment is limited. I have access to a 10 Mhz Rb source, a nice oscilloscope (sadly…
user3120921
  • 31
  • 3
0
votes
0 answers

TCXO output load

I’m using a 40 MHz TCXO to drive the clock input of an A/D chip. The output of the TCXO is DC coupled 1.8 V LVCMOS and it is specified in the TCXO datasheet that the output load is 10 pF // 10 kOhm. The clock input of the A/D should be AC coupled…
user345919
  • 1
0
votes
2 answers

TCXOs implications of use with Vcc over-voltage?

I'm looking at one of a stocked TCXO that suits the frequency and other system specifications like package etc, namely the 589R130X2C, except for the recommended Vcc of +3.0V for this part. I'm tempted to say it probably should work with a +3.3V…
citizen
  • 2,241
  • 7
  • 16
0
votes
1 answer

Connecting a TCXO to logic buffer

I am trying to connect the O/P from TCXO (FOX Electronics FOX924B. 20 MHz, 2.5 PPM, 3.3 V supply, Output HCMOS VOL = 0.5 V and VOH = 80% of VDD) to 74HC240 buffer, which I am also running at 3.3 V. I am not getting anything at the output of the…
Ashok Das
  • 33
  • 6
0
votes
3 answers

How to limit the output voltage of a TCXO?

I am using an SiT1552 MEMS TCXO providing 32.768 kHz. It will be sourcing two ICs: a microcontroller and a DA14580 Bluetooth Low Energy transceiver. The ICs and TCXO are all powered by 3.3V. The TCXO output is the standard 10%-90% LVCMOS voltage…
bitsmack
  • 16,747
  • 9
  • 52
  • 108
0
votes
0 answers

TCXO specification ambiguity

I am going through datasheet of TXKTPCSANF-32.000000. I require a clipped sine-wave TCXO with 1.8 Vpp maximum. However, the datasheet of the TCXO doesn't state the maximum Vpp. They have mentioned 0.8Vpp as minimum. Find the screenshot of the…
abhiarora
  • 952
  • 1
  • 12
  • 32
0
votes
2 answers

TCXO output load, and shaping circuit

I'm looking at the following datasheet for an accurate TCXO: TG2016SBN It gives values for Rload and Cload, and AC coupling cap - which I've incorporated into a clock pulsing circuit. Will a simple comparator (with a bit of hysteris) be enough to…
Wes
  • 51
  • 3
0
votes
3 answers

Calibrating a TCXO

I'm looking at using the si5351 in a signal generator. It will use a TCXO for improved stability, but I'd still like to calibrate it occasionally. To that end, one of the clock outputs will be set to 10MHz. When calibrating, I will connect an…
Alan Campbell
  • 1,019
  • 6
  • 10
-1
votes
0 answers

5V supply voltage IC for (VC)TCXO

Can you recommend an IC for TCXO with support for supply voltage up to 5 V? I found one option, but it will take a very long time to produce. https://www.mas-oy.com/wp-content/uploads/2017/09/DA6279D8_001.pdf Can you advise something?
Ignat Bronikov
  • 1
-2
votes
2 answers

TCXO Frequencies below 10MHz

why are there no TCXOs for 8MHz? Does this not work technically or are they not used at that frequency? The lowest I can find is 10Mhz. Thank you.
Uncle_Drew
  • 1