adf4108bruz-rl Analog Devices, Inc., adf4108bruz-rl Datasheet - Page 4

• Manufacturer Part Number: adf4108bruz-rl
• Description: Pll Frequency Synthesizer
• Manufacturer: Analog Devices, Inc.

ADF4108
Parameter
NOISE CHARACTERISTICS
1
2
3
4
5
6
7
8
9
10
11
Operating temperature range (B version) is –40°C to +85°C.
The B chip specifications are given as typical values.
This is the maximum operating frequency of the CMOS counters. The prescaler value should be chosen to ensure that the RF input is divided down to a frequency that
is less than this value.
AV
AC coupling ensures AV
Guaranteed by design. Sample tested to ensure compliance.
T
T
This value can be used to calculate phase noise for any application. Use the formula –219 + 10 log(f
at the VCO output. The value given is the lowest noise mode.
synthesizer (f
HMC506LP4 VCO.
The phase noise is measured with the EVAL-ADF4108EB1 evaluation board, with the Hittite HMC506LP4 VCO. The spectrum analyzer provides the REFIN for the
f
A
A
REFIN
Normalized Phase Noise Floor
Phase Noise Performance
Spurious Signals
= 25°C; AV
= 25°C; AV
DD
7900 MHz Output
7900 MHz Output
= DV
= 10 MHz; f
DD
= 3.3 V.
DD
DD
REFOUT
= DV
= DV
PFD
= 10 MHz @ 0 dBm).
= 1 MHz; f
DD
DD
= 3.3 V; P = 32; RF
= 3.3 V; R = 16,383; A = 63; B = 891; P = 32; RF
DD
/2 bias.
11
11
RF
= 7900 MHz; N = 7900; loop B/W = 50 kHz, VCO = HMC506LP4, spurs are dominated by the leakage current on the tuning port of the
10
9
IN
= 8 GHz, f
B Version
−219
−81
–61
PFD
= 200 kHz, REF
1
B Chips
(Typ)
−219
−81
–61
IN
IN
= 7.0 GHz.
= 10 MHz.
2
Rev. 0 | Page 4 of 20
Unit
dBc/Hz typ
dBc/Hz typ
dBc typ
PFD
Test Conditions/Comments
@ VCO output
@ 1 kHz offset and 1 MHz PFD frequency
@ 1 MHz offset and 1 MHz PFD frequency
) + 20 logN to calculate in-band phase noise performance as seen