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AD8346-EVAL

更新时间： 2024-11-20 22:50:03
品牌 Logo 应用领域
亚德诺 - ADI /
页数 文件大小 规格书
12页 194K
描述
0.8 GHz-2.5 GHz Quadrature Modulator

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AD8346-EVAL 数据手册

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0.8 GHz–2.5 GHz  
Quadrature Modulator  
a
AD8346  
FUNCTIONAL BLOCK DIAGRAM  
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–2.5 GHz  
Sideband Suppression: –46 dBc @ 0.8 GHz  
Sideband Suppression: –36 dBc @ 1.9 GHz  
Modulation Bandwidth: DC–70 MHz  
0 dBm Output Compression Level @ 0.8 GHz  
Noise Floor: –147 dBm/Hz  
IBBP  
IBBN  
COM1  
COM1  
LOIN  
QBBP  
QBBN  
COM4  
COM4  
VPS2  
1
2
3
4
5
6
7
8
16  
15  
14  
13  
12  
11  
10  
9
PHASE  
SPLITTER  
Single 2.7 V–5.5 V Supply  
Quiescent Operating Current: 45 mA  
Standby Current: 1 ␮A  
LOIP  
VOUT  
COM3  
COM2  
VPS1  
ENBL  
AD8346  
16-Lead TSSOP Package  
BIAS  
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  
PRODUCT DESCRIPTION  
This quadrature modulator can be used as the transmit modula-  
tor 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.  
The AD8346 is a silicon RFIC I/Q modulator for use from  
0.8 GHz to 2.5 GHz. Its excellent phase accuracy and ampli-  
tude 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 con-  
verters 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.  
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 is supplied in a 16-lead TSSOP package, measur-  
ing 6.5 × 5.1 × 1.1 mm. It is specified to operate over a  
–40°C to +85°C temperature range and 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. 0  
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  
which may result from its use. No license is granted by implication or  
otherwise under any patent or patent rights of Analog Devices.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781/329-4700  
Fax: 781/326-8703  
World Wide Web Site: http://www.analog.com  
© Analog Devices, Inc., 1999  
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