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ADF5902 Fiches technique(PDF) 34 Page - Analog Devices |
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ADF5902 Fiches technique(HTML) 34 Page - Analog Devices |
34 / 39 page ADF5902 Data Sheet Rev. 0 | Page 34 of 39 FREQUENCY MEASUREMENT PROCEDURE Use the following procedure to measure the output locked frequency of the ADF5902: 1. In Register R3, set the readback control bits (Bits[DB10:DB5]) to 26. 2. Read back the frequency counter value on DOUT and record this value as Frequency 1 (see Figure 3). 3. In Register R7, set the CLK1 bits (Bits[DB23:DB12]) to 1808. 4. In Register R13, set the CLK2 bits (Bits[DB18:DB7]) to 10. 5. In Register R5, set the ramp on bit (Bit DB29) to 0. 6. In Register R13, Set the clock divider mode bits (Bits[DB20:DB19]) to 2. 7. Allow a minimum delay of 428 μs (CLKDIV/fPFD (sec)). 8. In Register R3, set the readback control bits (Bits[DB10:DB5]) to 26. 9. Read back the frequency counter value on DOUT and record this value as Frequency 2. Where Frequency 1 > Frequency 2, Frequency Counter Value Delta = (216 − Frequency 1) + Frequency 2. Where Frequency 2 > Frequency 1, Frequency Counter Value Delta = Frequency 2 − Frequency 1. 10. Calculate the output frequency using the following formula: Output Frequency = (Frequency Counter Value Delta/ CLKDIV) × fPFD × NDIV × 2 where: CLKDIV = ((CLK2 × 212) + CLK1). fPFD = fREF/RDIV. NDIV = INT value + (FRAC value/(225)). 11. Set Register R13 and Register R7 back to the original settings and enable the ramp function in Register R5 if required. WAVEFORM GENERATION The ADF5902 is capable of generating five types of waveforms in the frequency domain: single ramp burst, single triangular burst, single sawtooth burst, continuous sawtooth ramp, and continuous triangular ramp. Figure 43 through Figure 47 show the types of waveforms available. TIME Figure 43. Single Ramp Burst TIME Figure 44. Single Triangular Burst TIME Figure 45. Single Sawtooth Burst TIME Figure 46. Continuous Sawtooth Ramp TIME Figure 47. Continuous Triangular Ramp WAVEFORM DEVIATIONS AND TIMING TIMER fDEV TIME Figure 48. Waveform Timing The key parameters that define a ramp are Frequency deviation Time per step Number of steps |
Numéro de pièce similaire - ADF5902 |
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Description similaire - ADF5902 |
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