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ADRF6820 データシート(PDF) 5 Page - Analog Devices

部品番号 ADRF6820
部品情報  Internal LO frequency range
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Data Sheet
ADRF6820
Rev. C | Page 5 of 45
SYNTHESIZER/PLL SPECIFICATIONS
VPOS_5V = 5 V, VPOS_3P3 = 3.3 V, ambient temperature (TA) = 25°C, fREF = 153.6 MHz, fREF power = 4 dBm, fPFD = 38.4 MHz, loop filter
bandwidth = 20 kHz, measured at LO output, unless otherwise noted.
Table 3.
Parameter
Test Conditions/Comments
Min
Typ
Max
Unit
PLL REFERENCE
Frequency
12
320
MHz
Amplitude
4
14
dBm
PLL Step Size1
PFD = 30.72 MHz
468.76
Hz
PLL Lock Time2
PFD = 30.72 MHz, charge pump = 500 µA,
loop bandwidth = 40 kHz, antibacklash delay = 0.5 ns,
charge pump bleed current = 78.125 µA down
5
ms
PFD FREQUENCY
24
40
MHz
INTERNAL VCO RANGE
2850
5700
MHz
REFERENCE SPURS
fREF = 153.6 MHz, fPFD = 38.4 MHz, fLO = 1809.6 MHz
fPFD/4
<−100
dBc
fPFD/2
<−100
dBc
fPFD × 1
−90.67
dBc
fPFD × 2
−95
dBc
fPFD × 3
−97
dBc
fPFD × 4
<−100
dBc
fPFD × 5
<−100
dBc
INTEGRATED PHASE NOISE3
1 kHz to 40 MHz integration bandwidth, PFD = 38.4 MHz,
fREF = 153.6 MHz, divide by 4, charge pump = 250 µA,
loop bandwidth = 20 kHz, antibacklash delay = 0 ns,
charge pump bleed current = 46.8 µA down,
LO frequency = 1562.5 MHz
0.6
°rms
CLOSED-LOOP PERFORMANCE
fLO = 1809.6, fREF = 153.6 MHz, fPFD = 38.4 MHz
20 kHz Loop Filter
10 kHz offset
−94.7
dBc/Hz
20 kHz offset
−95.8
dBc/Hz
100 kHz offset
−113
dBc/Hz
200 kHz offset
−122.4
dBc/Hz
600 kHz offset
−136.5
dBc/Hz
1 MHz offset
−141.5
dBc/Hz
10 MHz offset
−153.3
dBc/Hz
40 MHz offset
−154.6
dBc/Hz
1
Minimum PLL step size is a function of PFD. Value shown is based on PFD = 30.72 MHz, LO_DIV = 2, and the formula fPFD/65535 × 2/LO_DIV.
2
Lock time is defined as the time it takes from the end of a register write for a change in frequency to the point where the frequency of the output is within 500 Hz of
the intended frequency.
3
Measured with a nominal device with normal supply and temperature.


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