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ADF5902 Fiches technique(PDF) 34 Page - Analog Devices

No de pièce ADF5902
Description  24 GHz, ISM Band, Multichannel FMCW Radar Transmitter
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Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
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ADF5902 Fiches technique(HTML) 34 Page - Analog Devices

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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


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