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Analog Devices Semiconductor Electronic Components Datasheet

AD8345 Datasheet

140 MHz to 1000 MHz Quadrature Modulator

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FEATURES
140 MHz to 1000 MHz operating frequency
+2.5 dBm P1dB @ 800 MHz
−155 dBm/Hz noise floor
0.5 degree RMS phase error (IS95)
0.2 dB amplitude balance
Single 2.7 V to 5.5 V supply
Pin-compatible with AD8346 and AD8349
16-lead TSSOP_EP package
APPLICATIONS
Cellular communication systems
W-CDMA/CDMA/GSM/PCS/ISM transceivers
Fixed broadband access systems LMDS/MMDS
Wireless LAN
Wireless local loop
Digital TV/CATV modulators
Single sideband upconverter
PRODUCT DESCRIPTION
The AD8345 is a silicon RFIC quadrature modulator, designed
for use from 140 MHz to 1000 MHz. Its excellent phase
accuracy and amplitude balance enable the high performance
direct modulation of an IF carrier.
The AD8345 accurately splits the external LO signal into two
quadrature components through the polyphase phase splitter
network. The I and Q LO components are mixed with the
baseband I and Q differential input signals. Finally, the outputs
of the two mixers are combined in the output stage to provide a
single-ended 50 Ω drive at VOUT.
140 MHz to 1000 MHz
Quadrature Modulator
AD8345
FUNCTIONAL BLOCK DIAGRAM
IBBP 1
AD8345
16 QBBP
IBBN 2
15 QBBN
COM3 3
COM1 4
14 COM3
+
13 COM3
LOIN 5
LOIP 6
VPS1 7
ENBL 8
PHASE
SPLITTER
BIAS
12 VPS2
11 VOUT
10 COM2
9 COM3
Figure 1.
APPLICATIONS
The AD8345 modulator can be used as the IF transmit
modulator in digital communication systems such as GSM and
PCS transceivers. It can also directly modulate an LO signal to
produce QPSK and various QAM formats for 900 MHz
communication systems as well as digital TV and CATV
systems.
Additionally, this quadrature modulator can be used with direct
digital synthesizers in hybrid phase-locked loops to generate
signals over a wide frequency range with millihertz resolution.
The AD8345 modulator is supplied in a 16-lead TSSOP_EP
package. Its performance is specified over a −40°C to +85°C
temperature range. This device is fabricated on Analog Devices’
advanced silicon bipolar process.
Rev. B
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
© 2005 Analog Devices, Inc. All rights reserved.


Analog Devices Semiconductor Electronic Components Datasheet

AD8345 Datasheet

140 MHz to 1000 MHz Quadrature Modulator

No Preview Available !

AD8345* Product Page Quick Links
Last Content Update: 11/01/2016
Comparable Parts
View a parametric search of comparable parts
Evaluation Kits
• AD8345 Evaluation Board
Documentation
Application Notes
• AN-1039: Correcting Imperfections in IQ Modulators to
Improve RF Signal Fidelity
• AN-924: Digital Quadrature Modulator Gain
Data Sheet
• AD8345: 140 MHZ to 1000 MHz Quadrature Modulator
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
• Single-Sideband Upconversion of Quadrature DDS Signals
to the 800-to-2500MHz
Design Resources
• AD8345 Material Declaration
• PCN-PDN Information
• Quality And Reliability
• Symbols and Footprints
Discussions
View all AD8345 EngineerZone Discussions
Sample and Buy
Visit the product page to see pricing options
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 AD8345
Description 140 MHz to 1000 MHz Quadrature Modulator
Maker Analog Devices
Total Page 21 Pages
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