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Analog Devices - 1550 MHz to 2650 MHz Quadrature Modulator

Numéro de référence ADRF6703
Description 1550 MHz to 2650 MHz Quadrature Modulator
Fabricant Analog Devices 
Logo Analog Devices 





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ADRF6703 fiche technique
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1550 MHz to 2650 MHz Quadrature Modulator with
2100 MHz to 2600 MHz Frac-N PLL and Integrated VCO
ADRF6703
FEATURES
IQ modulator with integrated fractional-N PLL
RF output frequency range: 1550 MHz to 2650 MHz
Internal LO frequency range: 2100 MHz to 2600 MHz
Output P1dB: 14.2 dBm @ 2140 MHz
Output IP3: 33.2 dBm @ 2140 MHz
Noise floor: −159.6 dBm/Hz @ 2140 MHz
Baseband bandwidth: 750 MHz (3 dB)
SPI serial interface for PLL programming
Integrated LDOs and LO buffer
Power supply: 5 V/240 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
GENERAL DESCRIPTION
The ADRF6703 provides a quadrature modulator and
synthesizer solution within a small 6 mm × 6 mm footprint
while requiring minimal external components.
The ADRF6703 is designed for RF outputs from 1550 MHz to
2650 MHz. The low phase noise VCO and high performance
quadrature modulator make the ADRF6703 suitable for next
generation communication systems requiring high signal
dynamic range and linearity. The integration of the IQ
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 ADRF6703 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.
Table 1.
Part No.
ADRF6702
ADRF6703
Internal LO
Range
1550 MHz
2150 MHz
2100 MHz
2600 MHz
±3 dB RFOUT
Balun Range
1200 MHz
2400 MHz
1550 MHz
2650 MHz
VCC7
34
VCC6
29
VCC5
27
FUNCTIONAL BLOCK DIAGRAM
VCC4 VCC3 VCC2 VCC1
22 17
10
1
LOSEL 36
ADRF6703
LON 37
LOP 38
BUFFER
DIVIDER
÷2
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
0/90
40 DECL3
9 DECL2
2 DECL1
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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