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AD6122 Folha de dados(PDF) 1 Page - Analog Devices |
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AD6122 Folha de dados(HTML) 1 Page - Analog Devices |
1 / 20 page 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 which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a AD6122 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., 2000 CDMA 3 V Transmitter IF Subsystem with Integrated Voltage Regulator FUNCTIONAL BLOCK DIAGRAM I INPUT Q INPUT LOCAL OSCILLATOR INPUT ATTENUATOR LOW DROPOUT REGULATOR COMMON-MODE REFERENCE OUTPUT VREG POWER- DOWN 1 1.23 V REFERENCE OUTPUT VPOS TEMPERATURE COMPENSATION GAIN CONTROL SCALE FACTOR GAIN CONTROL VOLTAGE INPUT GAIN CONTROL REFERENCE VOLTAGE INPUT TRANSMIT OUTPUT IF AMPLIFIERS QUADRATURE MODULATOR POWER- DOWN 2 IF AMPLIFIER INPUT QUADRATURE MODULATOR OUTPUT 2 AD6122 VCC FEATURES Fully Compliant with IS98A and PCS Specifications Linear IF Amplifier –63 dB to +34 dB Linear-in-dB Gain Control Temperature-Compensated Gain Control Quadrature Modulator Modulates IFs from 50 MHz to 350 MHz Integral Low Dropout Regulator Accepts 2.9 V to 4.2 V Input from Battery Low Power 10.4 mA at Midgain <10 A Sleep Mode Operation Companion Receiver IF Chip Available (AD6121) APPLICATIONS CDMA, W-CDMA, AMPS and TACS Operation QPSK Transmitters GENERAL DESCRIPTION The AD6122 is a low power IF transmitter subsystem, specifi- cally designed for CDMA applications. It consists of an I and Q modulator, a divide-by-two quadrature generator, high dynamic range IF amplifiers with voltage-controlled gain and a power- down control input. An integral low dropout regulator allows operation from battery voltages from 2.9 V to 4.2 V. The gain control input accepts an external gain control voltage input from a DAC. It provides 97 dB of gain control with a nominal 75 dB/V scale factor. Either an internal or an external reference may be used to set the gain-control scale factor. The I and Q modulator accepts differential quadrature base- band inputs from a CDMA baseband converter. The local oscil- lator is injected at twice the IF frequency. A divide-by-two quadrature generator followed by dual polyphase filters ensures ±1° quadrature accuracy. The modulator provides a common-mode reference output to bias the transmit DACs in the baseband converter to the same common-mode voltage as the modulator inputs, allowing dc coupling between the two ICs and thus eliminating the need to charge and discharge coupling capacitors. This allows the fastest power-up and power-down times for the AD6122 and CDMA baseband ICs. The AD6122 is fabricated using a 25 GHz ft silicon BiCMOS process and is packaged in a 28-lead SSOP and a 32-leadless LPCC chip scale package (5 mm × 5 mm). |
Nº de peça semelhante - AD6122 |
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Descrição semelhante - AD6122 |
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