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AD9851 Arkusz danych(PDF) 1 Page - Analog Devices |
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AD9851 Arkusz danych(HTML) 1 Page - Analog Devices |
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1 / 23 page  REV. C 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 AD9851 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 CMOS 180 MHz DDS/DAC Synthesizer FUNCTIONAL BLOCK DIAGRAM 32-BIT TUNING WORD PHASE AND CONTROL WORDS FREQUENCY/PHASE DATA REGISTER DATA INPUT REGISTER 10-BIT DAC DAC RSET ANALOG OUT ANALOG IN CLOCK OUT CLOCK OUT HIGH SPEED DDS FREQUENCY UPDATE/DATA REGISTER RESET WORD LOAD CLOCK MASTER RESET REF CLOCK IN 6 REFCLK MULTIPLIER COMPARATOR SERIAL LOAD 1 BIT 40 LOADS PARALLEL LOAD 8 BITS 5 LOADS FREQUENCY, PHASE AND CONTROL DATA INPUT AD9851 +VS GND FEATURES 180 MHz Clock Rate with Selectable 6 Reference Clock Multiplier On-Chip High Performance 10-Bit DAC and High Speed Comparator with Hysteresis SFDR >43 dB @ 70 MHz AOUT 32-Bit Frequency Tuning Word Simplified Control Interface: Parallel or Serial Asynchronous Loading Format 5-Bit Phase Modulation and Offset Capability Comparator Jitter <80 ps p-p @ 20 MHz +2.7 V to +5.25 V Single Supply Operation Low Power: 555 mW @ 180 MHz Power-Down Function, 4 mW @ +2.7 V Ultrasmall 28-Lead SSOP Packaging APPLICATIONS Frequency/Phase-Agile Sine Wave Synthesis Clock Recovery and Locking Circuitry for Digital Communications Digitally Controlled ADC Encode Generator Agile L.O. Applications in Communications Quadrature Oscillator CW, AM, FM, FSK, MSK Mode Transmitter GENERAL DESCRIPTION The AD9851 is a highly integrated device that uses advanced DDS technology, coupled with an internal high speed, high performance D/A converter, and comparator, to form a digitally- programmable frequency synthesizer and clock generator func- tion. When referenced to an accurate clock source, the AD9851 generates a stable frequency and phase-programmable digitized analog output sine wave. This sine wave can be used directly as a frequency source, or internally converted to a square wave for agile-clock generator applications. The AD9851’s innovative high speed DDS core accepts a 32-bit frequency tuning word, which results in an output tuning resolution of approximately 0.04 Hz with a 180 MHz system clock. The AD9851 contains a unique 6 × REFCLK Multiplier circuit that eliminates the need for a high speed reference oscillator. The 6 × REFCLK Multiplier has minimal impact on SFDR and phase noise characteristics. The AD9851 provides five bits of programmable phase modula- tion resolution to enable phase shifting of its output in incre- ments of 11.25 °. The AD9851 contains an internal high speed comparator that can be configured to accept the (externally) filtered output of the DAC to generate a low jitter output pulse. The frequency tuning, control and phase modulation words are asynchronously loaded into the AD9851 via parallel or serial loading format. The parallel load format consists of five itera- tive loads of an 8-bit control word (byte). The first 8-bit byte controls output phase, 6 × REFCLK Multiplier, power-down enable and loading format; the remaining bytes comprise the 32-bit frequency tuning word. Serial loading is accomplished via a 40-bit serial data stream entering through one of the parallel input bus lines. The AD9851 uses advanced CMOS technology to provide this breakthrough level of functionality on just 555 mW of power dissipation (+5 V supply), at the maximum clock rate of 180 MHz. The AD9851 is available in a space-saving 28-lead SSOP, sur- face mount package that is pin-for-pin compatible with the popular AD9850 125 MHz DDS. It is specified to operate over the extended industrial temperature range of –40 °C to +85°C at >3.0 V supply voltage. Below 3.0 V, the specifications apply over the commercial temperature range of 0 °C to +85°C. |
Podobny numer części - AD9851 |
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Podobny opis - AD9851 |
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