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ADF4355 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADF4355
Beschreibung Microwave Wideband Synthesizer
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 30 Seiten
ADF4355 Datasheet, Funktion
Data Sheet
Microwave Wideband Synthesizer
with Integrated VCO
ADF4355
FEATURES
GENERAL DESCRIPTION
RF output frequency range: 54 MHz to 6800 MHz
Fractional-N synthesizer and integer-N synthesizer
High resolution 38-bit modulus
Low phase noise, voltage controlled oscillator (VCO)
Programmable divide by 1, 2, 4, 8, 16, 32, or 64 output
Analog and digital power supplies: 3.3 V
Charge pump and VCO power supplies: 5.0 V typical
Logic compatibility: 1.8 V
Programmable dual modulus prescaler of 4/5 or 8/9
Programmable output power level
RF output mute function
3-wire serial interface
Analog and digital lock detect
APPLICATIONS
Wireless infrastructure (W-CDMA, TD-SCDMA, WiMAX, GSM,
PCS, DCS, DECT)
Point to point/point to multipoint microwave links
Satellites/VSATs
Test equipment/instrumentation
Clock generation
The ADF4355 allows implementation of fractional-N or
integer-N phase-locked loop (PLL) frequency synthesizers
when used with an external loop filter and an external reference
frequency. A series of frequency dividers permits operation
from 54 MHz to 6800 MHz.
The ADF4355 has an integrated VCO with a fundamental
output frequency ranging from 3400 MHz to 6800 MHz. In
addition, the VCO frequency is connected to divide by 1, 2, 4, 8,
16, 32, or 64 circuits that allow the user to generate radio frequency
(RF) output frequencies as low as 54 MHz. For applications that
require isolation, the RF output stage can be muted. The mute
function is both pin and software controllable.
Control of all on-chip registers is through a simple 3-wire interface.
The ADF4355 operates with analog and digital power supplies
ranging from 3.15 V to 3.45 V, with charge pump and VCO
supplies from 4.75 V to 5.25 V. The ADF4355 also contains
hardware and software power-down modes.
FUNCTIONAL BLOCK DIAGRAM
CE
AVDD
DVDD
VP
RSET VVCO
VRF
AVDD
REFINA
REFIN B
CLK
DATA
LE
×2
DOUBLER
10-BIT R
COUNTER
÷2
DIVIDER
DATA REGISTER
FUNCTION
LATCH
INTEGER FRACTION MODULUS
REGISTER REGISTER REGISTER
THIRD-ORDER
FRACTIONAL
INTERPOLATOR
N COUNTER
LOCK
DETECT
MULTIPLEXER
CHARGE
PUMP
PHASE
COMPARATOR
VCO
CORE
÷116/2//342//864
OUTPUT
STAGE
OUTPUT
STAGE
MUXOUT
CREG1
CREG2
CPOUT
VTUNE
VREF
VBIAS
VREGVCO
RFOUTA+
RFOUTA–
PDBRF
RFOUTB+
RFOUTB–
AGND
CPGND
AGNDRF
Figure 1.
MULTIPLEXER
SDGND AGNDVCO
ADF4355
Rev. A
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rights of third parties that may result from its use. Specifications subject to change without notice. No
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Tel: 781.329.4700 ©2015–2016 Analog Devices, Inc. All rights reserved.
Technical Support
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ADF4355 Datasheet, Funktion
Data Sheet
ADF4355
TIMING CHARACTERISTICS
AVDD = DVDD =VRF = 3.3 V ± 5%, 4.75 V ≤ VP = VVCO ≤ 5.25 V, AGND = CPGND = AGNDVCO = SDGND = AGNDRF = 0 V, RSET = 5.1 kΩ,
dBm referred to 50 Ω, TA = TMIN to TMAX, unless otherwise noted.
Table 2. Write Timing
Parameter
Limit
fCLK 50
t1 10
t2 5
t3 5
t4 10
t5 10
t6 5
t7 20 or (2/fPFD), whichever is longer
Unit
MHz max
ns min
ns min
ns min
ns min
ns min
ns min
ns min
Description
Serial peripheral interface CLK frequency
LE setup time
DATA to CLK setup time
DATA to CLK hold time
CLK high duration
CLK low duration
CLK to LE setup time
LE pulse width
Write Timing Diagram
CLK
DATA
DB31 (MSB)
t4 t5
t2 t3
DB30
DB3
(CONTROL BIT C4)
DB2
(CONTROL BIT C3)
DB1
(CONTROL BIT C2)
LE
t1
Figure 2. Write Timing Diagram
DB0 (LSB)
(CONTROL BIT C1)
t7
t6
Rev. A | Page 5 of 35

6 Page









ADF4355 pdf, datenblatt
Data Sheet
0.50
RMS JITTER (ps) 1kHz TO 20MHz
0.45 RMS JITTER (ps) 12kHz TO 20MHz
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0
0.8 1.8 2.8 3.8 4.8 5.8 6.8
OUTPUT FREQUENCY (GHz)
Figure 16. RMS Jitter vs. Output Frequency, PFD Frequency = 61.44 MHz,
Loop Filter = 20 kHz
–50
PFD = 15.36MHz
PFD = 30.72MHz
PFD = 61.44MHz
–60
–70
–80
–90
–100
–110
0 1 23 45 67
RFOUTA+/RFOUTA– OUTPUT FREQUENCY (GHz)
Figure 17. PFD Spur Amplitude vs. RFOUTA+/RFOUTA− Output Frequency,
PFD = 15.36 MHz, PFD = 30.72 MHz, PFD = 61.44 MHz, Loop Filter = 20 kHz
–80
–90
–100
–110
–120
–130
–140
–150
–160
1k
10k 100k 1M 10M 100M
FREQUENCY (Hz)
Figure 18. Fractional-N Spur Performance, GSM1800 Band, RFOUTA+ =
1550.2 MHz, REFIN = 122.88 MHz, PFD = 61.44 MHz, Output Divide by 4
Selected, Loop Filter Bandwidth = 20 kHz, Channel Spacing = 20 kHz
ADF4355
–80
–90
–100
–110
–120
–130
–140
–150
–160
1k
10k 100k 1M 10M 100M
FREQUENCY (Hz)
Figure 19. Fractional-N Spur Performance, W-CDMA Band, RFOUTA+ =
2113.5 MHz, REFIN = 122.88 MHz, PFD = 61.44 MHz, Output Divide by 2
Selected, Loop Filter Bandwidth = 20 kHz, Channel Spacing = 20 kHz
–80
–90
–100
–110
–120
–130
–140
–150
–160
1k
10k 100k 1M 10M 100M
FREQUENCY (Hz)
Figure 20. Fractional-N Spur Performance, RFOUTA+ = 2.591 GHz,
REFIN = 122.88 MHz, PFD = 61.44 MHz, Output Divide-by-2 Selected,
Loop Filter Bandwidth = 20 kHz, Channel Spacing = 20 kHz
4.65
4.60
4.55
4.50
4.45
1
4.40
4.35
4.30
4.25
4.20
4.15
–1 0 1 2 3 4
TIME (ms)
Figure 21. Lock Time for 250 MHz Jump from 4150 MHz to 4400 MHz,
Loop Bandwidth = 20 kHz
Rev. A | Page 11 of 35

12 Page





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