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Analog Devices Semiconductor Electronic Components Datasheet

AD8346 Datasheet

0.8 GHz-2.5 GHz Quadrature Modulator

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AD8346 pdf
FEATURES
High accuracy
1 degree rms quadrature error @ 1.9 GHz
0.2 dB I/Q amplitude balance @ 1.9 GHz
Broad frequency range: 0.8 GHz to 2.5 GHz
Sideband suppression: −46 dBc @ 0.8 GHz
Sideband suppression: −36 dBc @ 1.9 GHz
Modulation bandwidth: dc to 70 MHz
0 dBm output compression level @ 0.8 GHz
Noise floor: −147 dBm/Hz
Single 2.7 V to 5.5 V supply
Quiescent operating current: 45 mA
Standby current: 1 μA
16-lead TSSOP
APPLICATIONS
Digital and spread spectrum communication systems
Cellular/PCS/ISM transceivers
Wireless LAN/wireless local loop
QPSK/GMSK/QAM modulators
Single-sideband (SSB) modulators
Frequency synthesizers
Image reject mixer
GENERAL DESCRIPTION
The AD8346 is a silicon RFIC I/Q modulator for use from
0.8 GHz to 2.5 GHz. Its excellent phase accuracy and amplitude
balance allow high performance direct modulation to RF.
The differential LO input is applied to a polyphase network
phase splitter that provides accurate phase quadrature from
0.8 GHz to 2.5 GHz. Buffer amplifiers are inserted between
two sections of the phase splitter to improve the signal-to-
noise ratio. The I and Q outputs of the phase splitter drive the
LO inputs of two Gilbert-cell mixers. Two differential V-to-I
converters connected to the baseband inputs provide the
baseband modulation signals for the mixers. The outputs of
the two mixers are summed together at an amplifier which is
designed to drive a 50 Ω load.
0.8 GHz to 2.5 GHz
Quadrature Modulator
AD8346
FUNCTIONAL BLOCK DIAGRAM
IBBP 1
IBBN 2
COM1 3
COM1 4
LOIN 5
LOIP 6
VPS1 7
ENBL 8
PHASE
SPLITTER
BIAS
AD8346
16 QBBP
15 QBBN
14 COM4
13 COM4
12 VPS2
11 VOUT
10 COM3
9 COM2
Figure 1.
This quadrature modulator can be used as the transmit mod-
ulator in digital systems such as PCS, DCS, GSM, CDMA, and
ISM transceivers. The baseband quadrature inputs are directly
modulated by the LO signal to produce various QPSK and
QAM formats at the RF output.
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 AD8346 comes in a 16-lead TSSOP package, measuring
6.5 mm × 5.1 mm × 1.1 mm. It is specified to operate over a
−40°C to +85°C temperature range and a 2.7 V to 5.5 V supply
voltage range. The device is fabricated on Analog Devices’ high
performance 25 GHz bipolar silicon process.
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. Trademarks and
registered trademarks are the property of their respective companies.
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

AD8346 Datasheet

0.8 GHz-2.5 GHz Quadrature Modulator

No Preview Available !

AD8346 pdf
AD8346* Product Page Quick Links
Last Content Update: 11/01/2016
Comparable Parts
View a parametric search of comparable parts
Evaluation Kits
• AD8346 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
• AD8346: 0.8 GHz-2.5 GHz Quadrature Modulator Data
Sheet
Tools and Simulations
• ADIsimPLL™
• ADIsimRF
Reference Materials
Product Selection Guide
• RF Source Booklet
Technical Articles
• Detecting Fast RF Bursts using Log Amps
• Simplifying Direct-Conversion Tx Paths in Wireless
Designs
• Single Chip Realizes Direct-Conversion Rx
Design Resources
• AD8346 Material Declaration
• PCN-PDN Information
• Quality And Reliability
• Symbols and Footprints
Discussions
View all AD8346 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 AD8346
Description 0.8 GHz-2.5 GHz Quadrature Modulator
Maker Analog Devices
Total Page 21 Pages
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