Datasheet

ADF4350
Rev. A | Page 4 of 32
B Version
Parameter
Min Typ Max
Unit Conditions/Comments
NOISE CHARACTERISTICS
VCO Phase-Noise Performance
6
−89 dBc/Hz 10 kHz offset from 2.2 GHz carrier
−114 dBc/Hz 100 kHz offset from 2.2 GHz carrier
−134 dBc/Hz 1 MHz offset from 2.2 GHz carrier
−148 dBc/Hz 5 MHz offset from 2.2 GHz carrier
−86 dBc/Hz 10 kHz offset from 3.3 GHz carrier
−111 dBc/Hz 100 kHz offset from 3.3 GHz carrier
−134 dBc/Hz 1 MHz offset from 3.3 GHz carrier
−145 dBc/Hz 5 MHz offset from 3.3 GHz carrier
−83 dBc/Hz 10 kHz offset from 4.4 GHz carrier
−110 dBc/Hz 100 kHz offset from 4.4 GHz carrier
−132 dBc/Hz 1 MHz offset from 4.4 GHz carrier
−145 dBc/Hz 5 MHz offset from 4.4 GHz carrier
Normalized Phase Noise Floor
(PN
SYNTH
)
7
−220 dBc/Hz PLL Loop BW = 500 kHz
Normalized 1/f Noise (PN
1_f
)
8
−111 dBc/Hz 10 kHz offset; normalized to 1 GHz
In-Band Phase Noise
9
−97 dBc/Hz 3 kHz offset from 2113.5 MHz carrier
Integrated RMS Jitter
10
0.5 ps
Spurious Signals Due to PFD Frequency −70 dBc
Level of Signal With RF Mute Enabled −40 dBm
1
AC coupling ensures AV
DD
/2 bias.
2
Guaranteed by design. Sample tested to ensure compliance.
3
I
CP
is internally modified to maintain constant loop gain over the frequency range.
4
T
A
= 25°C; AV
DD
= DV
DD
= V
VCO
= 3.3 V; prescaler = 8/9; f
REFIN
= 100 MHz; f
PFD
= 25 MHz; f
RF
= 4.4 GHz.
5
Using 50 Ω resistors to V
VCO
, into a 50 Ω load. Power measured with auxiliary RF output disabled. The current consumption of the auxiliary output is the same as for the
main output.
6
The noise of the VCO is measured in open-loop conditions.
7
The synthesizer phase noise floor is estimated by measuring the in-band phase noise at the output of the VCO and subtracting 20 log N (where N is the N divider
value) and 10 log F
PFD
. PN
SYNTH
= PN
TOT
− 10 log F
PFD
− 20 log N.
8
The PLL phase noise is composed of 1/f (flicker) noise plus the normalized PLL noise floor. The formula for calculating the 1/f noise contribution at an RF frequency, f
RF
,
and at a frequency offset f is given by PN = P
1_f
+ 10log(10 kHz/f) + 20log(f
RF
/1 GHz). Both the normalized phase noise floor and flicker noise are modeled in ADIsimPLL.
9
f
REFIN
= 100 MHz; f
PFD
= 25 MHz; offset frequency = 10 kHz; VCO frequency = 4227 MHz, output divide by two enabled. RF
OUT
= 2113.5 MHz; N = 169; loop BW = 40 kHz,
I
CP
= 313 μA; low noise mode. The noise was measured with an EVAL-ADF4350EB1Z and the Agilent E5052A signal source analyzer.
10
f
REFIN
= 100 MHz; f
PFD
= 25 MHz; VCO frequency = 4400 MHz, RF
OUT
= 4400 MHz; N = 176; loop BW = 40 kHz, I
CP
= 313 μA; low noise mode. The noise was measured with
an EVAL-ADF4350EB1Z and the Agilent E5052A signal source analyzer.