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AD8346ARU-REEL 데이터시트(PDF) 1 Page - Analog Devices |
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AD8346ARU-REEL 데이터시트(HTML) 1 Page - Analog Devices |
1 / 12 page 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. a AD8346 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 1999 0.8 GHz–2.5 GHz Quadrature Modulator FUNCTIONAL BLOCK DIAGRAM 1 2 3 4 5 6 7 8 BIAS PHASE SPLITTER 16 15 14 13 12 11 10 9 AD8346 IBBP IBBN COM1 COM1 LOIN LOIP VPS1 ENBL QBBP QBBN COM4 COM4 VPS2 VOUT COM3 COM2 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 Single 2.7 V–5.5 V Supply Quiescent Operating Current: 45 mA Standby Current: 1 A 16-Lead TSSOP Package 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 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. 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. 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. |
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