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Analog Devices Semiconductor Electronic Components Datasheet

AD8348 Datasheet

50-1000 MHz Quadrature Demodulator

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FEATURES
Integrated I/Q demodulator with IF VGA amplifier
Operating IF frequency 50 MHz to 1000 MHz
(3 dB IF BW of 500 MHz driven from RS = 200 Ω)
Demodulation bandwidth 75 MHz
Linear-in-decibel AGC range 44 dB
Third-order intercept
IIP3 +28 dBm @ minimum gain (FIF = 380 MHz)
IIP3 −8 dBm @ maximum gain (FIF = 380 MHz)
Quadrature demodulation accuracy
Phase accuracy 0.5°
Amplitude balance 0.25 dB
Noise figure 11 dB @ maximum gain (FIF = 380 MHz)
LO input −10 dBm
Single supply 2.7 V to 5.5 V
Power-down mode
Compact, 28-lead TSSOP package
APPLICATIONS
QAM/QPSK demodulator
W-CDMA/CDMA/GSM/NADC
Wireless local loop
LMDS
GENERAL DESCRIPTION
The AD8348 is a broadband quadrature demodulator with an
integrated intermediate frequency (IF), variable gain amplifier
(VGA), and integrated baseband amplifiers. It is suitable for use in
communications receivers, performing quadrature demodulation
from IF directly to baseband frequencies. The baseband amplifiers
are designed to interface directly with dual-channel ADCs, such
as the AD9201, AD9283, and AD9218, for digitizing and post-
processing.
The IF input signal is fed into two Gilbert cell mixers through
an X-AMP® VGA. The IF VGA provides 44 dB of gain control.
A precision gain control circuit sets a linear-in-decibel gain char-
acteristic for the VGA and provides temperature compensation.
The LO quadrature phase splitter employs a divide-by-2 frequency
divider to achieve high quadrature accuracy and amplitude balance
over the entire operating frequency range.
Optionally, the IF VGA can be disabled and bypassed. In this
mode, the IF signal is applied directly to the quadrature mixer
inputs via the MXIP and MXIN pins.
Rev. A
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.
50 MHz to 1000 MHz
Quadrature Demodulator
AD8348
FUNCTIONAL BLOCK DIAGRAM
VREF
14
IMXO
8
IOFS
13
IAIN
6
IOPP IOPN
43
ENBL 15
BIAS
CELL
VREF
IFIP 11
IFIN 10
VGIN 17
GAIN
CONTROL
18 19
24
MXIP MXIN ENVG
DIVIDE
BY 2
PHASE
SPLITTER
VCMO
AD8348
5 VCMO
1 LOIP
28 LOIN
VCMO
21
QXMO
16
QOFS
Figure 1.
23
QAIN
25 26
QOPP QOPN
Separate I- and Q-channel baseband amplifiers follow the baseband
outputs of the mixers. The voltage applied to the VCMO pin sets
the dc common-mode voltage level at the baseband outputs.
Typically, VCMO is connected to the internal VREF voltage, but
it can also be connected to an external voltage. This flexibility
allows the user to maximize the input dynamic range to the ADC.
Connecting a bypass capacitor at each offset compensation input
(IOFS and QOFS) nulls dc offsets produced in the mixer. Offset
compensation can be overridden by applying an external voltage
at the offset compensation inputs.
The mixers’ outputs are brought off-chip for optional filtering
before final amplification. Inserting a channel selection filter
before each baseband amplifier increases the baseband amplifiers’
signal handling range by reducing the amplitude of high level,
out-of-channel interferers before the baseband signal is fed into
the I/Q baseband amplifiers. The single-ended mixer output is
amplified and converted to a differential signal for driving ADCs.
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
©2006 Analog Devices, Inc. All rights reserved.


Analog Devices Semiconductor Electronic Components Datasheet

AD8348 Datasheet

50-1000 MHz Quadrature Demodulator

No Preview Available !

AD8348* Product Page Quick Links
Last Content Update: 11/01/2016
Comparable Parts
View a parametric search of comparable parts
Evaluation Kits
• AD8348 Evaluation Board
Documentation
Application Notes
• AN-924: Digital Quadrature Modulator Gain
Data Sheet
• AD8348: 50-1000 MHz Quadrature Demodulator Data
Sheet
Tools and Simulations
• ADIsimPLL™
• ADIsimRF
Reference Materials
Product Selection Guide
• RF Source Booklet
Technical Articles
• Simplifying Direct-Conversion Tx Paths in Wireless
Designs
Design Resources
• AD8348 Material Declaration
• PCN-PDN Information
• Quality And Reliability
• Symbols and Footprints
Discussions
View all AD8348 EngineerZone Discussions
Sample and Buy
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Technical Support
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number
* This page was dynamically generated by Analog Devices, Inc. and inserted into this data sheet. Note: Dynamic changes to
the content on this page does not constitute a change to the revision number of the product data sheet. This content may be
frequently modified.


Part Number AD8348
Description 50-1000 MHz Quadrature Demodulator
Maker Analog Devices
Total Page 29 Pages
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