ADF4157 AD [Analog Devices], ADF4157 Datasheet - Page 7

• Manufacturer Part Number: ADF4157
• Description: High Resolution 6 GHz Fractional-N Frequency Synthesizer
• Manufacturer: AD [Analog Devices]

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