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AD6432AST 데이터시트(PDF) 1 Page - Analog Devices |
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AD6432AST 데이터시트(HTML) 1 Page - Analog Devices |
1 / 20 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 AD6432 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 World Wide Web Site: http://www.analog.com Fax: 617/326-8703 © Analog Devices, Inc., 1997 GSM 3 V Transceiver IF Subsystem FUNCTIONAL BLOCK DIAGRAM SAW BP OP AMP AD6432 PA RF SYNTH IF SYNTH PLO FEATURES Fully Compliant with Standard and Enhanced GSM Specification DC-350 MHz RF Bandwidths 80 dB Gain Control Range I/Q Modulation and Demodulation Onboard Phase Locked Tunable Oscillator On-Chip Noise Roofing IF Filters Ultralow Power Design 2.7 V–3.6 V Operating Voltage User-Selectable Power-Down Modes Small 44-Lead TQFP Package Interfaces Directly with AD20msp410 and AD20msp415 GSM Baseband Chipsets APPLICATIONS I/Q Modulated Digital Wireless Systems GSM Mobile Radios GSM PCMCIA Cards GENERAL DESCRIPTION The AD6432 IF IC provides the complete transmit and receive IF signal processing, including I/Q modulation and demodula- tion, necessary to implement a digital wireless transceiver such as a GSM handset. The AD6432 may also be used for other wireless TDMA standards using I/Q modulation. The AD6432’s receive signal path is based on the proven archi- tecture of the AD607 and the AD6459. It consists of a mixer, gain-controlled amplifiers, integrated roofing filter and I/Q demodulators based on a PLL. The low noise, high-intercept variable-gain mixer is a doubly-balanced Gilbert-cell type. It has a nominal –13 dBm input-referred 1 dB compression point and a 0 dBm input-referred third-order intercept. The gain-control input accepts an external control voltage input from an external AGC detector or a DAC. It provides an 80 dB gain range with 27.5 mV/dB gain scaling, where the mixer and the IF gains vary together. The I and Q demodulators provide inphase and quadrature baseband outputs to interface with Analog Devices’ AD7015 and AD6421 (GSM, DCS1800, PCS1900) baseband convert- ers. An onboard quadrature VCO, externally phase-locked to the IF signal, drives the I and Q demodulators. The quadrature phase-locked oscillator (QPLO) requires no external compo- nents for frequency control or quadrature generation, and de- modulates signals at standard GSM system IFs of 13 MHz, or 26 MHz with a reference input frequency of 13 MHz; or, in general, 1X or 2X the reference frequency. Maximum reference frequency is 25 MHz. This reference signal is normally provided by an external VCTCXO under the control of the radio’s digital signal processor. The transmit path consists of an I/Q modulator and buffer amplifier, suitable for carrier frequencies up to 300 MHz and provides an output power of –17.5 dBm in a 50 Ω system. The quadrature LO signals driving the I and Q modulator are generated internally by dividing by two the frequency of the signal presented at the differential LO port of the AD6432. In both the transmit and receive paths, onboard filters provide 30 dB of stopband attenuation. The AD6432 comes in a 44-lead plastic thin quad flatpack (TQFP) surface mount package. |
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