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AD8349 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer AD8349
Beschreibung Quadrature Modulator
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 29 Seiten
AD8349 Datasheet, Funktion
Data Sheet
FEATURES
Output frequency range: 700 MHz to 2700 MHz
Modulation bandwidth: dc to 160 MHz (large signal BW)
1 dB output compression: 5.6 dBm @ 2140 MHz
Output disable function: output below –50 dBm in < 50 ns
Noise floor: –156 dBm/Hz
Phase quadrature error: 0.3 degrees @ 2140 MHz
Amplitude balance: 0.1 dB
Single supply: 4.75 V to 5.5 V
Pin compatible with AD8345/AD8346s
16-lead, exposed-paddle TSSOP package
APPLICATIONS
Cellular/PCS communication systems infrastructure
WCDMA/CDMA2000/PCS/GSM/EDGE
Wireless LAN/wireless local loop
LMDS/broadband wireless access systems
PRODUCT DESCRIPTION
The AD8349 is a silicon, monolithic, RF quadrature modulator
that is designed for use from 700 MHz to 2700 MHz. Its
excellent phase accuracy and amplitude balance enable high
performance direct RF modulation for communication systems.
The differential LO input signal is buffered, and then split into
an in-phase (I) signal and a quadrature-phase (Q) signal using a
polyphase phase splitter. These two LO signals are further
buffered and then mixed with the corresponding I channel and
Q channel baseband signals in two Gilbert cell mixers. The
mixers’ outputs are then summed together in the output
amplifier. The output amplifier is designed to drive 50 Ω loads.
The RF output can be switched on and off within 50 ns by
applying a control pulse to the ENOP pin.
700 MHz to 2700 MHz
Quadrature Modulator
AD8349
FUNCTIONAL BLOCK DIAGRAM
IBBP 1
AD8349
16 QBBP
IBBN 2
15 QBBN
COM1 3
COM1 4
14 COM3
Σ
13 COM3
LOIN 5
LOIP 6
PHASE
SPLITTER
12 VPS2
11 VOUT
VPS1 7
ENOP 8
BIAS
10 COM3
9 COM2
Figure 1.
The AD8349 can be used as a direct-to-RF modulator in digital
communication systems such as GSM, CDMA, and WCDMA
base stations, and QPSK or QAM broadband wireless access
transmitters. Its high dynamic range and high modulation
accuracy also make it a perfect IF modulator in local multipoint
distribution systems (LMDS) using complex modulation
formats.
The AD8349 is fabricated using Analog Devices’ advanced
complementary silicon bipolar process, and is available in a 16-
lead, exposed-paddle TSSOP package. Its performance is
specified over a –40°C to +85°C temperature range.
Rev. B
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor 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 ©2003–2012 Analog Devices, Inc. All rights reserved.






AD8349 Datasheet, Funktion
Data Sheet
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
Supply Voltage VPOS
IBBP, IBBN, QBBP, QBBN
LOIP and LOIN
Internal Power Dissipation
θJA (Exposed Paddle Soldered Down)
Maximum Junction Temperature
Operating Temperature Range
Storage Temperature Range
Rating
5.5 V
0 V, 2.5 V
10 dBm
800 mW
30°C/W
125°C
−40°C to +85°C
−65°C to +150°C
AD8349
tresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
ESD CAUTION
Rev. B | Page 5 of 28

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AD8349 pdf, datenblatt
Data Sheet
AD8349
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NOISE FLOOR (dBm/Hz)
Figure 25. 20 MHz Offset Noise Floor Distribution at FLO = 900 MHz
(BB Inputs at a Bias of 400 mV with no AC signal, TA = 25°C)
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NOISE FLOOR (dBm/Hz)
Figure 26. 20 MHz Offset Noise Floor Distribution at FLO = 1900 MHz
(BB Inputs at a Bias of 400 mV with no AC signal, TA = 25°C)
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NOISE FLOOR (dBm/Hz)
Figure 27. 20 MHz Offset Noise Floor Distribution at FLO = 2140 MHz
(BB Inputs at a Bias of 400 mV with no AC signal, TA = 25°C)
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6
4
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NOISE FLOOR (dBm/Hz)
Figure 28. 20 MHz Offset Noise Floor Distribution at FLO = 940 MHz
(FBB = 1 MHz, I and Q Inputs Driven in Quadrature at 1.2 V p-p, TA = 25°C)
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6
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NOISE FLOOR (dBm/Hz)
Figure 29. 20 MHz Offset Noise Floor Distribution at FLO = 1960 MHz
(FBB = 1 MHz, I and Q Inputs Driven in Quadrature at 1.2 V p-p, TA = 25°C)
30
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14
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NOISE FLOOR (dBm/Hz)
Figure 30. 20 MHz Offset Noise Floor Distribution at FLO = 2140 MHz
(FBB = 1 MHz, I and Q Inputs Driven in Quadrature at 1.2 V p-p, TA = 25°C)
Rev. B | Page 11 of 28

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