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PDF AD8345 Data sheet ( Hoja de datos )
| Número de pieza | AD8345 | |
| Descripción | 140 MHz to 1000 MHz Quadrature Modulator | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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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.
1 page  
AD8345
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
Rating
Supply Voltage VPS1, VPS2
Input Power LOIP, LOIN (re 50 Ω)
5.5 V
10 dBm
IBBP, IBBN, QBBP, QBBN
0 V, 2.5 V
Internal Power Dissipation
500 mW
θJA (Exposed Paddle Soldered Down)
θJA (Exposed Paddle not Soldered Down)
Maximum Junction Temperature
Operating Temperature Range
Storage Temperature Range
Lead Temperature Range (Soldering 60 sec)
30°C/W
95°C/W
150°C
−40°C to +85°C
−65°C to +150°C
300°C
Stresses 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
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on
the human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degrada-
tion or loss of functionality.
Rev. B | Page 4 of 20
5 Page 
AD8345
EQUIVALENT CIRCUITS
VPS2
BUFFER
TO MIXER
CORE
INPUT
CURRENT
MIRROR
Figure 23. Circuit A
VPS1
LOIN
LOIP
PHASE
SPLITTER
CONTINUES
Figure 24. Circuit B
VPS2
ENBL
100kΩ
100kΩ
100kΩ
TO BIAS FOR
STARTUP/
SHUTDOWN
Figure 25. Circuit C
VPS2
40Ω
VOUT
40Ω
Figure 26. Circuit D
Rev. B | Page 10 of 20
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet AD8345.PDF ] | |
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