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AD7008AP20 Scheda tecnica(PDF) 1 Page - Analog Devices |
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AD7008AP20 Scheda tecnica(HTML) 1 Page - Analog Devices |
1 / 16 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 AD7008 © Analog Devices, Inc., 1995 One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703 CMOS DDS Modulator FEATURES Single +5 V Supply 32-Bit Phase Accumulator On-Chip COSINE and SINE Look-Up Tables On-Chip 10-Bit DAC Frequency, Phase and Amplitude Modulation Parallel and Serial Loading Software and Hardware Power Down Options 20 MHz and 50 MHz Speed Grades 44-Pin PLCC APPLICATIONS Frequency Synthesizers Frequency, Phase or Amplitude Modulators DDS Tuning Digital Modulation phase modulation, frequency modulation, and both in-phase and quadrature amplitude modulation suitable for QAM and SSB generation. Clock rates up to 20 MHz and 50 MHz are supported. Fre- quency accuracy can be controlled to one part in 4 billion. Modulation may be effected by loading registers either through the parallel microprocessor interface or the serial interface. A frequency-select pin permits selection between two frequencies on a per cycle basis. The serial and parallel interfaces may be operated independently and asynchronously from the DDS clock; the transfer control signals are internally synchronized to prevent metastability prob- lems. The synchronizer can be bypassed to reduce the transfer latency in the event that the microprocessor clock is synchro- nous with the DDS clock. A power-down pin allows external control of a power-down mode (also accessible through the microprocessor interface) The AD7008 is available in 44-pin PLCC. PRODUCT HIGHLIGHT 1. Low Power 2. DSP/ µP Interface 3. Completely Integrated PRODUCT DESCRIPTION The AD7008 direct digital synthesis chip is a numerically con- trolled oscillator employing a 32-bit phase accumulator, sine and cosine look-up tables and a 10-bit D/A converter integrated on a single CMOS chip. Modulation capabilities are provided for FUNCTIONAL BLOCK DIAGRAM 32 32 12 10 10 10 10 10 SIN COS 12 10-BIT DAC PHASE ACCUMULATOR SIN/COS ROM IQMOD [9:0] IOUT COMP FS ADJUST SDATA SCLK GND RESET TEST CLOCK V AA WR CS IOUT AD7008 32-BIT SERIAL REGISTER 32-BIT PARALLEL REGISTER COMMAND REG MPU INTERFACE TRANSFER LOGIC FULLSCALE ADJUST 10 IQMOD [19:10] 12 PHASE REG D0 D15 32 32 FSELECT MUX FREQ1 REG TC0 TC3 LOAD Σ 10 Σ FREQ0 REG Σ SLEEP V REF |
Codice articolo simile - AD7008AP20 |
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Descrizione simile - AD7008AP20 |
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