Overview
The AD9851BRSZRL, produced by Analog Devices Inc., is a highly integrated CMOS 180 MHz Direct Digital Synthesis (DDS)/DAC Synthesizer. This device combines advanced DDS technology with an internal high-speed, high-performance D/A converter and a comparator to form a digitally programmable frequency synthesizer and clock generator. It generates a stable frequency and phase-programmable digitized analog output sine wave, which can be used directly or converted internally to a square wave for agile-clock generator applications.
Key Specifications
| Parameter | Min | Typ | Max | Unit | |
|---|---|---|---|---|---|
| Frequency Range (6× REFCLK Multiplier Disabled) | 5.0 V Supply | 1 | 180 | MHz | |
| Frequency Range (6× REFCLK Multiplier Disabled) | 3.3 V Supply | 1 | 125 | MHz | |
| Frequency Range (6× REFCLK Multiplier Disabled) | 2.7 V Supply | 0°C to 85°C | 1 | 100 | MHz |
| Frequency Range (6× REFCLK Multiplier Enabled) | 5.0 V Supply | 5 | 30 | MHz | |
| Frequency Range (6× REFCLK Multiplier Enabled) | 3.3 V Supply | 5 | 20.83 | MHz | |
| Frequency Range (6× REFCLK Multiplier Enabled) | 2.7 V Supply | 0°C to 85°C | 5 | 16.66 | MHz |
| Duty Cycle | Full IV | 45 | 60 | % | |
| Input Resistance | 25°C | V | 1 | MΩ | |
| Minimum Switching Thresholds | Logic 1, 5.0 V Supply | 25°C | IV | 3.5 | V |
| Power Dissipation | 5 V Supply, 180 MHz Clock | 555 | mW | ||
| Operating Temperature Range | –40°C to +85°C |
Key Features
- Advanced DDS technology with a 32-bit frequency tuning word, providing an output tuning resolution of approximately 0.04 Hz with a 180 MHz system clock.
- Internal high-speed, high-performance D/A converter and comparator.
- 6× REFCLK Multiplier circuit to eliminate the need for a high-speed reference oscillator.
- Five bits of programmable phase modulation resolution, enabling phase shifting in increments of 11.25°.
- Support for both parallel and serial loading formats for frequency tuning, control, and phase modulation words.
- Low jitter output pulse generation using the internal high-speed comparator.
- Space-saving 28-lead SSOP, surface-mount package.
- Pin-for-pin compatibility with the AD9850 125 MHz DDS.
Applications
- Agile-clock generator applications.
- Frequency synthesis in various communication systems.
- Phase shifting and modulation in RF and microwave systems.
- Test and measurement equipment requiring precise frequency generation.
- Wireless communication systems, including cellular and satellite communications.
Q & A
- What is the AD9851BRSZRL used for? The AD9851BRSZRL is used as a digitally programmable frequency synthesizer and clock generator.
- What is the maximum clock frequency of the AD9851BRSZRL? The maximum clock frequency is 180 MHz.
- What is the resolution of the frequency tuning word? The resolution is approximately 0.04 Hz with a 180 MHz system clock.
- Does the AD9851BRSZRL support phase modulation? Yes, it supports phase modulation with five bits of programmable resolution.
- What is the power dissipation of the AD9851BRSZRL at maximum clock rate? The power dissipation is 555 mW at 5 V supply and 180 MHz clock rate.
- What is the operating temperature range of the AD9851BRSZRL? The operating temperature range is –40°C to +85°C.
- What package type is the AD9851BRSZRL available in? It is available in a 28-lead SSOP, surface-mount package.
- Is the AD9851BRSZRL compatible with other DDS models? Yes, it is pin-for-pin compatible with the AD9850 125 MHz DDS.
- How does the AD9851BRSZRL generate low jitter output pulses? It uses an internal high-speed comparator to generate low jitter output pulses.
- What are the loading formats supported by the AD9851BRSZRL? It supports both parallel and serial loading formats for frequency tuning, control, and phase modulation words.
