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ADRF6704 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADRF6704
Beschreibung 2050 MHz to 3000 MHz Quadrature Modulator
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 36 Seiten
ADRF6704 Datasheet, Funktion
Data Sheet
2050 MHz to 3000 MHz Quadrature Modulator with
2500 MHz to 2900 MHz Frac-N PLL and Integrated VCO
ADRF6704
FEATURES
IQ modulator with integrated fractional-N PLL
Output frequency range: 2050 MHz to 3000 MHz
Internal LO frequency range: 2500 MHz to 2900 MHz
Output P1dB: 12.1 dBm @ 2700 MHz
Output IP3: 27.2 dBm @ 2700 MHz
Noise floor: −158.3 dBm/Hz @ 2700 MHz
Baseband bandwidth: 750 MHz (3 dB)
SPI serial interface for PLL programming
Integrated LDOs and LO buffer
Power supply: 5 V/226 mA
40-lead 6 mm × 6 mm LFCSP
APPLICATIONS
Cellular communications systems
GSM/EDGE, CDMA2000, W-CDMA, TD-SCDMA, LTE
Broadband wireless access systems
Satellite modems
modulator, PLL, and VCO provides for significant board
savings and reduces the BOM and design complexity.
The integrated fractional-N PLL/synthesizer generates a 2× fLO
input to the IQ modulator. The phase detector together with an
external loop filter is used to control the VCO output. The VCO
output is applied to a quadrature divider. To reduce spurious
components, a sigma-delta (Σ-Δ) modulator controls the
programmable PLL divider.
The IQ modulator has wideband differential I and Q inputs,
which support baseband as well as complex IF architectures.
The single-ended modulator output is designed to drive a
50 Ω load impedance and can be disabled.
The ADRF6704 is fabricated using an advanced silicon-
germanium BiCMOS process. It is available in a 40-lead,
exposed-paddle, Pb-free, 6 mm × 6 mm LFCSP package.
Performance is specified from −40°C to +85°C. A lead-free
evaluation board is available.
GENERAL DESCRIPTION
Table 1.
The ADRF6704 provides a quadrature modulator and
synthesizer solution within a small 6 mm × 6 mm footprint
while requiring minimal external components.
The ADRF6704 is designed for RF outputs from 2050 MHz to
3000 MHz. The low phase noise VCO and high performance
quadrature modulator make the ADRF6704 suitable for next
generation communication systems requiring high signal
dynamic range and linearity. The integration of the IQ
Part No.
ADRF6701
ADRF6702
ADRF6703
ADRF6704
Internal LO Range
750 MHz
1150 MHz
1550 MHz
2150 MHz
2100 MHz
2600 MHz
2500 MHz
2900 MHz
IQ Modulator
±3 dB RF Output Range
400 MHz
1250 MHz
1200 MHz
2400 MHz
1550 MHz
2650 MHz
2050 MHz
3000 MHz
VCC7
34
VCC6
29
VCC5
27
FUNCTIONAL BLOCK DIAGRAM
VCC4 VCC3 VCC2 VCC1
22 17
10
1
LOSEL 36
ADRF6704
LON 37
LOP 38
BUFFER
DIVIDER
÷2
40 DECL3
9 DECL2
BUFFER
DATA 12
CLK 13
LE 14
REFIN 6
MUXOUT 8
SPI
INTERFACE
×2
MUX
÷2
÷4
FRACTION
REG
MODULUS
INTEGER
REG
THIRD-ORDER
FRACTIONAL
INTERPOLATOR
N COUNTER
21 TO 123
TEMP
SENSOR
+
PHASE
FREQUENCY
DETECTOR
PRESCALER
÷2
CHARGE PUMP
250µA,
500µA (DEFAULT),
750µA,
1000µA
4 7 11 15 20 21 23 25 28 30 31 35 24
5
GND
NOTES
1. NC = NO CONNECT. DO NOT CONNECT TO THIS PIN.
NC RSET
Figure 1.
2:1
MUX
VCO
CORE
3 39 16 26
CP VTUNE ENOP RFOUT
2 DECL1
÷2
0/90
18 QP
19 QN
32 IN
33 IP
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2011 Analog Devices, Inc. All rights reserved.
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ADRF6704 Datasheet, Funktion
ADRF6704
Data Sheet
TIMING CHARACTERISTICS
Table 3.
Parameter
t1
t2
t3
t4
t5
t6
t7
Limit
20
10
10
25
25
10
20
Unit
ns min
ns min
ns min
ns min
ns min
ns min
ns min
Test Conditions/Comments
LE to CLK 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
CLK
t4 t5
DATA
DB23 (MSB)
LE
t2 t3
DB22
DB2
(CONTROL BIT C3)
DB1
(CONTROL BIT C2)
DB0 (LSB)
(CONTROL BIT C1)
t6
t7
t1
Figure 2. Timing Diagram
Rev. 0 | Page 6 of 36
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ADRF6704 pdf, datenblatt
ADRF6704
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
–130
–140
–150
–160
1
–40°C
+25°C
+85°C
2.5kHz LOOP FILTER
130kHz LOOP FILTER
10 100 1000
10000
OFFSET FREQUENCY (kHz)
100000
Figure 16. Phase Noise vs. Offset Frequency and Temperature,
fLO = 2500 MHz
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
–130
–140
–150
–160
1
–40°C
+25°C
+85°C
2.5kHz LOOP FILTER
130kHz LOOP FILTER
10 100 1000
10000
OFFSET FREQUENCY (kHz)
100000
Figure 17. Phase Noise vs. Offset Frequency and Temperature,
fLO = 2700 MHz
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
–130
–140
–150
–160
1
–40°C
+25°C
+85°C
2.5kHz LOOP FILTER
130kHz LOOP FILTER
10 100 1000
10000
100000
OFFSET FREQUENCY (kHz)
Figure 18. Phase Noise vs. Offset Frequency and Temperature,
fLO = 2900 MHz
Data Sheet
1.0
–40°C
0.9
+25°C
+85°C
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
2500
2550
2600 2650 2700 2750 2800
LO FREQUENCY (MHz)
2850
2900
Figure 19. Integrated Phase Noise vs. LO Frequency
–80
OFFSET = 1kHz
–90
–100
–110
–120
–130
–40°C
+25°C
+85°C
–140
OFFSET = 100kHz
OFFSET = 5MHz
–150
2500
2550
2600 2650 2700 2750 2800
LO FREQUENCY (MHz)
2850
2900
Figure 20. Phase Noise vs. LO Frequency at 1 kHz, 100 kHz, and 5 MHz Offsets
–80 –40°C
+25°C
–90 +85°C
–100
OFFSET = 10kHz
–110
–120
–130
OFFSET = 1MHz
–140
–150
2500 2550 2600 2650 2700 2750 2800 2850 2900
LO FREQUENCY (MHz)
Figure 21. Phase Noise vs. LO Frequency at 10 kHz and 1 MHz Offsets
Rev. 0 | Page 12 of 36
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