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Description: The DS1077 is a dual-output, programmable, oscillator requiring no external components for operation. The DS1077 can be used as a processor-controlled frequency synthesizer or as a standalone oscillator. The two synchronous output operating frequencies are user-adjustable in submultiples of the master frequency through the use of two on-chip programmable prescalers and a divider. The specific output frequencies chosen are stored in non-volatile (EEPROM) memory. The DS1077 defaults to these values upon power-up.

The DS1077 features a 2-wire serial interface that allows in-circuit on-the-fly programming of the programmable prescalers (P0 & P1) and divider (N) with the desired values being stored in NV (EEPROM) memory. Design changes can be accommodated in-circuit on-the-fly by simply programming different values into the device (or reprogramming previously programmed devices). Alternatively, for fixed frequency applications, previously programmed devices can be used and no connection to the serial interface is required.

Features:


  • Processor-controlled or standalone solidstate oscillator
  • Frequency changes on-the-fly
  • Dual low-jitter, synchronous fixed frequency outputs
  • 2-wire serial interface (I2C)
  • Frequency outputs 16.2kHz to 133MHz
  • ?0.5% variation over temp (+25?C to +70?C)
  • ?0.5% initial tolerance
  • Nonvolatile (NV) setting storage
  • Single 5V supply
  • No external component
  • Power-down mod
  • Synchronous output gatin

Documents:

Comments 30 comments

  • Looks pretty cool, but the frequency range you spec doesn’t quite match the data sheet. The DS1077-133 you have pictured ranges from 133 MHz down to 16.2 kHz, not 8.1 kHz. If you need to go down to 8.1 kHz, the data sheet seems to show that you would need the DS1077-66 version.

  • Just curious if anyone has tried using this at the high frequencies to produce square wave? I also am getting more of a sine wave looking waveform at around 20MHz. I was hoping to get around 30MHz with clean square wave so I’m guessing I’ll need to use this clock with some other circuitry. I was thinking high gain opamp and clipping the output with zeners for a 0-3.3V range. Anyone try anything similar (or different in implementation to get clean results)?

    Perhaps, a different chip is in need??

  • I don’t know if I’m being a bit stupid but I can’t find the typical rise and fall time on the datasheet. I need a programmable oscillator that has a rise and fall time of between 2 and 5 nano seconds, does anyone know if this will do this?

    Cheers

  • I’m looking for an oscillator to do 16.9344MHz. The closest speed the Frequency Calculator from Maxim gives me is 16.66MHz. Is that close enough? If not, could someone link me one that I could use?

    • Only you can determine what you can use. Do you want SMT, or through hole? Do you want high accuracy, or do you prefer to save some pennies? How much temperature drift can you withstand?
      Start here: http://search.digikey.com/us/en/cat/crystals-and-oscillators/crystals/852333?k=Crystal%2016.9344MHZ

  • I’m wondering if this can be used as an external oscillator for a uC. My application requires an accurate timebase, won’t experience any significant temperature fluctuations, and will undergo MASSIVE accelerations (too great for quarts crystals to survive). I don’t have any clue as to how uC’s run crystals so I’m not sure how this would work…

    • A rocket?
      Look at the uC datasheet, and you should see a CLK input line near the XTAL pins.

  • one thing im dieing 2 find is a pwm controller because im having trouble generating a pwm signal @ 25khz off of my arduino to control a 4 pin fan. any1 got any tips?

    • this chip would not do what you want.
      Does it have to be 25Khz? If it can be near it, say 32khz than look here:
      http://www.arduino.cc/playground/Code/PwmFrequency

  • Hi could you confirm that this is the 150mil SO version (DS1077Z), not the 118mil uSOP (DS1077U)?
    It’s implied by the fact that there is an SOIC converter PCB as a related product, but it would be good to confirm this.

  • Hmmmm. I’m thinking PicAxe-controlled QRP beacon/transmitter with band-switching. Especially 10M to 6M bands (28MHz/50MHz).

  • Hmmmm. I’m thinking PicAxe-controlled QRP beacon/transmitter with band-switching. Especially 10M to 6M bands (28MHz/50MHz).

  • EEPROM wears out in in a finite number of writes(under a few million for a lot of chips).
    lol i was just thinking about designing a MCU of this that ran at audio frequencies but used multiple wavetables at independent speeds that could be mixed, all under serial control.

    • As described in the data sheet, you can control whether or not the EEPROM is written to. So if you’re going to use this for frequency hopping, turn that off.

  • I’m guessing this produces a square wave? Does anyone know if it can produce a sine wave? I know you can get that by filtering the square wave but I’d like to be able to still use the full range.
    Also, does anyone know if there is a limit to the number of writes it can handle? What I’m actually wondering is if this could be the basis of a cheap (too good to be true) VFO.

    • This one produces a square wave. This explains why DDS chips cost way more :p

      • It’s relatively easy to get a sine out of a square wave. Simply add a low-pass filter with the 3db point near the frequency you want out of it. Just make sure that you check the harmonics!

    • Not sure about the write limits, probably higher than you need to be concerned with though.
      The output has gotta be a square wave. Why else would it use a prescaler?

      • Well, my oscilloscope was showing sine, but there are a few things that could cause it to show a false sine, because of its age.

        • My scope would show a sine at 20Mhz, since it would only be fast enough to show the primary frequency, not the edges. Show a slow frequency and it’ll be square.

    • Im pretty sure its a sine wave.

  • Anyone know if you could use this for building an RFID detector/reader for various different frequencies of tags?

  • A recent Instructable contains lots of helpful material on the I2C Bus along with drivers and example code for the ATtiny2313 and the ATmega168. Has all that’s needed to control this chip.
    The Instructable is here:
    http://www.instructables.com/id/I2C_Bus_for_ATtiny_and_ATmega/


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