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Documents ADUC834: What external clocks can be used? Can the PLL be bypassed?
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  • +ADuC812: FAQ
  • +ADUC814: FAQ
  • +ADUC816: FAQ
  • +ADUC824: FAQ
  • +ADuC831: FAQ
  • +ADUC832: FAQ
  • -ADUC834: FAQ
    • The ADuC834 has separate pins for analog and digital power supplies. Can I run from a split supply, for example a 3.3V DVDD and a 5V AVDD?
    • ADUC834: Can I convert a single-ended input voltage by grounding one of primary ADC diff inputs?
    • ADUC834: Can I use analog inputs on Port 1 pins for digital I/0?
    • ADUC834: Do I need external reset generator?
    • ADUC834: Does changing the PLL divider value via the CD bits in PLLCON affect the baud rate?
    • ADUC834: Driving LEDs directly from digital outputs, what pins should I use?
    • ADUC834: How do I configure the UART serial port at 9600/115200 baud?
    • ADUC834: How do I use the on-chip temperature sensor feature of the ADuC834?
    • ADUC834: I am changing ranges and I am seeing much more than 2uV gain mis-match. Why?
    • ADUC834: I want to initiate the serial downloader through the SPI port, how can I do this?
    • ADUC834: Impact of fast logic edges on analog performance
    • ADuC834: Interfacing the ADuC834 to a RTD
    • ADUC834: Is it possible to accidently write to security bits and prevent part entering download mode?
    • ADUC834: Is it possible to switch OFF the internal buffer of primary ADC?
    • ADUC834: Minimum and maximum external voltage references allowed by the ADuC834.
    • ADUC834: Overwriting the ADC factory calibration coefficients
    • ADuC834: pinout decriptions missing for CSP pins 28and 29
    • ADUC834: Should I use the internal voltage reference or an external voltage reference?
    • ADUC834: The reference input is differential. Can I use a single ended reference?
    • ADUC834: Use of PSEN pin on Microcontroller v 8051
    • ADuC834: Values of the internal pull up resistor
    • ADUC834: What are the implications of having unbuffered differential reference inputs?
    • ADUC834: What baud rates can be achieved?
    • ADUC834: What external clocks can be used? Can the PLL be bypassed?
    • ADUC834: What is lowest power consumption configuration for 10 hour sample conversion intervals?
    • ADUC834: What is the minimum time (or ADC cycles) to get a reading if the input is a step?
    • ADUC834: What's the difference between the INL spec and the noise spec on the ADC?
    • ADUC834: Why does ADC effective resolution depend on range and update rate
    • ADUC834: Why is there a different result when using internal voltage ref compared to external 2.5V ref?
    • Why does it take the ADuC834 so long to power on?
  • +ADuC836: FAQ
  • +ADuC83x: FAQ
  • +ADUC841: FAQ
  • +ADuC842: FAQ
  • +ADUC845: FAQ
  • +ADuC847: FAQ
  • +ADUC848: FAQ
  • +ADuC84x: FAQ
  • +ADUC8xx: FAQ
  • +ADUCXX: FAQ

ADUC834: What external clocks can be used? Can the PLL be bypassed?

Q 

What external clocks can be used with the ADuC834? Can the PLL be bypassed?

 

A 

The PLL circuit on the ADuC834 will lock to 384 times the input clock as long
as the clock
frequency is within the frequency range 32.768kHz ± 20%. The ADC incorporates
50Hz and 60Hz
rejection filters which assume a 32.768kHz input frequency. Using an input
clock that differs from
32.768kHz will cause these rejection filters to move.
Although it is possible to use the ADuC834 with an input clock other than
32.768kHz it is
recommended that you use a 32.768kHz clock/crystal to preserve the ADC
functionality.
There is no mode of operation on the ADuC834 that allows the PLL to be
bypassed. Hence the
ADuC834 cannot be driven directly with an oscillator other than 32.768kHz
+/-20%.

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