50 MHz to 2 GHz
Quadrature Demodulator
ADL5387
FUNCTIONAL BLOCK DIAGRAM
FEATURES
24
CMRF CMRF RFIP RFIN CMRF VPX
VPB
23
22
21
20
19
Operating RF frequency
50 MHz to 2 GHz
LO input at 2 × fLO
1
2
3
4
5
6
18
VPA
COM
BIAS
VPL
VPL
VPL
100 MHz to 4 GHz
VPB 17
QHI 16
QLO 15
IHI 14
Input IP3: 31 dBm @ 900 MHz
Input IP2: 62 dBm @ 900 MHz
Input P1dB: 13 dBm @ 900 MHz
Noise figure (NF)
12.0 dB @ 140 MHz
14.7 dB @ 900 MHz
Voltage conversion gain > 4 dB
Quadrature demodulation accuracy
Phase accuracy ~0.4°
Amplitude balance ~0.05 dB
Demodulation bandwidth ~240 MHz
Baseband I/Q drive 2 V p-p into 200 Ω
Single 5 V supply
DIVIDE-BY-2
PHASE SPLITTER
ILO 13
CML LOIP LOIN CML CML COM
10 11 12
7
8
9
Figure 1.
APPLICATIONS
QAM/QPSK RF/IF demodulators
W-CDMA/CDMA/CDMA2000/GSM
Microwave point-to-(multi)point radios
Broadband wireless and WiMAX
Broadband CATVs
GENERAL DESCRIPTION
The ADL5387 is a broadband quadrature I/Q demodulator that
covers an RF/IF input frequency range from 50 MHz to 2 GHz.
With a NF = 13.2 dB, IP1dB = 12.7 dBm, and IIP3 = 32 dBm @
450 MHz, the ADL5387 demodulator offers outstanding dynamic
range suitable for the demanding infrastructure direct-conversion
requirements. The differential RF/IF inputs provide a well-
behaved broadband input impedance of 50 Ω and are best
driven from a 1:1 balun for optimum performance.
The fully balanced design minimizes effects from second-order
distortion. The leakage from the LO port to the RF port is
<−70 dBc. Differential dc-offsets at the I and Q outputs are
<10 mV. Both of these factors contribute to the excellent IIP2
specifications > 60 dBm.
The ADL5387 operates off a single 4.75 V to 5.25 V supply. The
supply current is adjustable with an external resistor from the
BIAS pin to ground.
Ultrabroadband operation is achieved with a divide-by-2 method
for local oscillator (LO) quadrature generation. Over a wide
range of LO levels, excellent demodulation accuracy is
achieved with amplitude and phase balances ~0.05 dB and
~0.4°, respectively. The demodulated in-phase (I) and
quadrature (Q) differential outputs are fully buffered and
provide a voltage conversion gain of >4 dB. The buffered
baseband outputs are capable of driving a 2 V p-p differential
signal into 200 Ω.
The ADL5387 is fabricated using the Analog Devices, Inc.
advanced silicon-germanium bipolar process and is available in
a 24-lead exposed paddle LFCSP.
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.
Trademarks and registeredtrademarks arethe property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
www.analog.com
©2007 Analog Devices, Inc. All rights reserved.
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