Datasheet

ADF4157 Data Sheet
Rev. D | Page 8 of 24
TYPICAL PERFORMANCE CHARACTERISTICS
PFD = 25 MHz, loop bandwidth = 20 kHz, reference = 100 MHz, I
CP
= 313 μA, phase noise measurements taken on the Agilent E5052A
phase noise system.
10
–40
0 9
FREQUENCY (GHz)
POWER (dBm)
5
0
–5
–10
–15
–20
–25
–30
–35
1 2 3 4 5 6 7 8
P = 4/5
P = 8/9
05874-016
Figure 5. RF Input Sensitivity
0
–40
0 500
FREQUENCY (MHz)
POWER (dBm)
–5
–10
–15
–20
–25
–30
–35
100 200 300 400
V
DD
= 3V
05874-017
Figure 6. Reference Input Sensitivity
0
–160
1k 10M
FREQUENCY (Hz)
PHASE NOISE (dBc/Hz)
–20
–40
–60
–80
–100
–120
–140
10k 100k 1M
RF = 5800.25MHz, PFD = 25MHz, N = 232,
FRAC = 335544, FREQUENCY RESOLUTION = 0.74Hz,
20kHz LOOP BW, I
CP
= 313µA, DSB INTEGRATED PHASE
ERROR = 0.97° RMS, PHASE NOISE @ 2kHz = –87dBc/Hz.
05874-018
Figure 7. Phase Noise and Spurs
(Note that the 250 kHz spur is an integer boundary spur; see the Spur
Mechanisms section for more information.)
6.00
5.65
–100 900
TIME (µs)
FREQUENCY (GHz)
5.95
5.90
5.85
5.80
5.75
5.70
0 100 200 300 400 500 600 700 800
CSR OFF
CSR ON
05874-019
Figure 8. Lock Time for 200 MHz Jump from 5705 MHz to 5905 MHz
with CSR On and Off
5.65
5.60
5.95
5.90
5.85
5.80
5.75
5.70
–100 900
T
IME (µs)
FREQUENCY (GHz)
0 100 200 300 400 500 600 700 800
CSR ON
CSR OFF
05874-020
Figure 9. Lock Time for 200 MHz Jump from 5905 MHz to 5705 MHz
with CSR On and Off
6
–6
0 5.0
05874-021
V
CP
(V)
I
CP
(mA)
4
2
0
–2
–4
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
Figure 10. Charge Pump Output Characteristics, Pump Up and Pump Down