ADL5387(RevB) 查看數據表（PDF） - Analog Devices
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ADL5387 Datasheet PDF : 28 Pages
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Data Sheet
FEATURES
Operating RF frequency
30 MHz to 2 GHz
LO input at 2 × fLO
60 MHz to 4 GHz
Input IP3: 31 dBm at 900 MHz
Input IP2: 62 dBm at 900 MHz
Input P1dB: 13 dBm at 900 MHz
Noise figure (NF)
12.0 dB at 140 MHz
14.7 dB at 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
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 30 MHz to 2 GHz.
With a NF = 13.2 dB, IP1dB = 12.7 dBm, and IIP3 = 32 dBm at
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.
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.
Rev. B
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30 MHz to 2 GHz
Quadrature Demodulator
ADL5387
FUNCTIONAL BLOCK DIAGRAM
24 23 22 21 20 19
CMRF CMRF RFIP RFIN CMRF VPX
1 VPA
VPB 18
2 COM
VPB 17
3 BIAS
4 VPL
DIVIDE-BY-2
PHASE SPLITTER
QHI 16
QLO 15
5 VPL
IHI 14
6 VPL
ILO 13
CML LOIP LOIN CML CML COM
7
8
9 10 11 12
Figure 1.
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.
The ADL5387 is fabricated using the Analog Devices, Inc.,
advanced silicon-germanium bipolar process and is available in
a 24-lead exposed paddle LFCSP.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2007–2013 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
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