AD9850BRSZ-REEL Integrated Circuits (ICs)

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1. DESCRIPTION

The AD9850BRSZ-REEL 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 complete, digitally programmable frequency synthesizer and clock generator function. When referenced to an accurate clock source, the AD9850BRSZ-REEL generates a spectrally pure, frequency/phase programmable, analog output sine wave. This sine wave can be used directly as a frequency source, or it can be converted to a square wave for agile-clock generator applications. The AD9850BRSZ-REEL’s innovative high speed DDS core provides a 32-bit frequency tuning word, which results in an output tuning resolution of 0.0291 Hz for a 125 MHz reference clock input. The AD9850BRSZ-REEL’s circuit architecture allows the generation of output frequencies of up to one-half the reference clock frequency (or 62.5 MHz), and the output frequency can be digitally changed (asynchronously) at a rate of up to 23 million new frequencies per second. The device also provides five bits of digitally controlled phase modulation, which enables phase shifting of its output in increments of 180°, 90°, 45°, 22.5°, 11.25°, and any combination thereof. The AD9850 also contains a high speed comparator that can be configured to accept the (externally) filtered output of the DAC to generate a low jitter square wave output. This facilitates the device’s use as an agile clock generator function. The frequency tuning, control, and phase modulation words are loaded into the AD9850BRSZ-REEL via a parallel byte or serial loading format. The parallel load format consists of five iterative loads of an 8-bit control word (byte). The first byte controls phase modulation, power-down enable, and loading format; Bytes 2 to 5 comprise the 32-bit frequency tuning word. Serial loading is accomplished via a 40-bit serial data stream on a single pin. The AD9850BRSZ-REEL Complete DDS uses advanced CMOS technology to provide this breakthrough level of functionality and performance on just 155 mW of power dissipation (3.3 V supply). The AD9850BRSZ-REEL is available in a space-saving 28-lead SSOP, surface-mount package. It is specified to operate over the extended industrial temperature range of –40°C to +85°C

2. FEATURES

    1. 125 MHz Clock Rate

    2. On-Chip High Performance DAC and High Speed Comparator

    3. DAC SFDR > 50 dB @ 40 MHz AOUT

    4. 32-Bit Frequency Tuning Word

    5. Simplified Control Interface: Parallel Byte or Serial Loading Format

    6. Phase Modulation Capability

    7. 3.3 V or 5 V Single-Supply Operation

    8. Low Power

        - 380 mW @ 125 MHz (5 V)

        - 155 mW @ 110 MHz (3.3 V)

    9. Power-Down Function

  10. Ultrasmall 28-Lead SSOP Packaging

3. APPLICATIONS

    1. Frequency/Phase—Agile Sine Wave Synthesis

    2. Clock Recovery and Locking Circuitry for Digital Communications

    3. Digitally Controlled ADC Encode Generator

    4. Agile Local Oscillator Applications