Overview
The AD9851BRS, produced by Analog Devices Inc., is a highly integrated Direct Digital Synthesis (DDS) and Digital-to-Analog Converter (DAC) synthesizer. This device utilizes advanced DDS technology, combined with a high-speed, high-performance DAC 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) | 100 MHz | - | 180 MHz | MHz |
| Frequency Range (6× REFCLK Multiplier Enabled) | 16.66 MHz | - | 30 MHz | MHz |
| Duty Cycle | 45% | 60% | 65% | % |
| Input Resistance | - | - | 1 MΩ | Ω |
| Supply Voltage | 2.7 V | - | 5.5 V | V |
| Power Dissipation (Max Clock Rate) | - | - | 555 mW | mW |
| Operating Temperature Range | -40°C | - | +85°C | °C |
| Package Type | - | - | 28-SSOP | - |
| Tuning Word Width | - | - | 32 bits | bits |
| DAC Resolution | - | - | 10 bits | bits |
Key Features
- Advanced DDS technology with a high-speed, high-performance DAC and comparator.
- Generates a stable frequency and phase-programmable digitized analog output sine wave.
- Internal 6× REFCLK Multiplier circuit to eliminate the need for a high-speed reference oscillator.
- 32-bit frequency tuning word for an output tuning resolution of approximately 0.04 Hz with a 180 MHz system clock.
- Five bits of programmable phase modulation resolution, enabling phase shifting in increments of 11.25°.
- Internal high-speed comparator for generating low jitter output pulses.
- Asynchronous loading of frequency tuning, control, and phase modulation words via parallel or serial formats.
- Low power dissipation of 555 mW at maximum clock rate.
- Extended industrial temperature range operation from -40°C to +85°C.
Applications
- Agile-clock generator applications.
- Frequency synthesis in various communication systems.
- Phase modulation and phase shifting applications.
- Low jitter clock generation for high-speed digital systems.
- Test and measurement equipment requiring precise frequency control.
- Radar and electronic warfare systems.
Q & A
- What is the AD9851BRS used for?
The AD9851BRS is used as a digitally programmable frequency synthesizer and clock generator, generating stable frequency and phase-programmable digitized analog output sine waves.
- What is the maximum frequency range of the AD9851BRS without the 6× REFCLK Multiplier?
The maximum frequency range without the 6× REFCLK Multiplier is 180 MHz at a 5 V supply.
- How does the AD9851BRS achieve phase modulation?
The AD9851BRS achieves phase modulation with five bits of programmable phase modulation resolution, allowing phase shifting in increments of 11.25°.
- What is the power dissipation of the AD9851BRS at maximum clock rate?
The power dissipation is 555 mW at the maximum clock rate.
- What is the operating temperature range of the AD9851BRS?
The operating temperature range is from -40°C to +85°C.
- What package type is the AD9851BRS available in?
The AD9851BRS is available in a 28-SSOP package.
- How is the frequency tuning word loaded into the AD9851BRS?
The frequency tuning word can be loaded asynchronously via parallel or serial formats.
- What is the resolution of the DAC in the AD9851BRS?
The DAC resolution is 10 bits.
- What is the purpose of the internal high-speed comparator in the AD9851BRS?
The internal high-speed comparator is used to generate low jitter output pulses.
- Can the AD9851BRS be used in high-speed digital systems?
Yes, the AD9851BRS can be used in high-speed digital systems due to its low jitter clock generation capability.
