Overview
The AD9851BRSZ, produced by Analog Devices Inc., is a highly integrated CMOS 180 MHz Direct Digital Synthesizer (DDS) and Digital-to-Analog Converter (DAC) synthesizer. This device leverages advanced DDS technology, combined with an internal 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 (2.7 V Supply) | - | 180 MHz (5.0 V Supply) | MHz |
| Frequency Range (6× REFCLK Multiplier Enabled) | 16.66 MHz (2.7 V Supply) | - | 30 MHz (5.0 V Supply) | MHz |
| Duty Cycle | 45% | 60% | - | % |
| Input Resistance | - | - | 1 MΩ | Ω |
| Power Dissipation | - | - | 555 mW (5 V Supply, 180 MHz clock) | mW |
| Operating Temperature Range | -40°C | - | +85°C | °C |
| Package Type | - | - | 28-lead SSOP | - |
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 DAC and comparator for generating stable frequency and phase-programmable digitized analog output sine waves.
- 6× REFCLK Multiplier circuit that eliminates the need for a high-speed reference oscillator, with minimal impact on SFDR and phase noise characteristics.
- Five bits of programmable phase modulation resolution, enabling phase shifting of the output in increments of 11.25°.
- Asynchronous loading of frequency tuning, control, and phase modulation words via parallel or serial loading formats.
- Low jitter output pulse generation using the internal high-speed comparator.
- Operation over an extended industrial temperature range of –40°C to +85°C at >3.0 V supply voltage.
Applications
- Agile-clock generator applications, where the sine wave output can be converted internally to a square wave.
- Frequency synthesis in various communication systems, including RF and microwave applications.
- Phase modulation and phase shifting in signal processing and transmission systems.
- Test and measurement equipment requiring precise frequency generation.
- Wireless communication systems, including transmitters and receivers.
Q & A
- What is the AD9851BRSZ?
The AD9851BRSZ is a CMOS 180 MHz Direct Digital Synthesizer (DDS) and Digital-to-Analog Converter (DAC) synthesizer produced by Analog Devices Inc..
- What is the frequency tuning resolution of the AD9851BRSZ?
The AD9851BRSZ has a frequency tuning resolution of approximately 0.04 Hz with a 180 MHz system clock.
- What is the purpose of the 6× REFCLK Multiplier in the AD9851BRSZ?
The 6× REFCLK Multiplier eliminates the need for a high-speed reference oscillator and has minimal impact on SFDR and phase noise characteristics.
- How does the AD9851BRSZ support phase modulation?
The AD9851BRSZ provides five bits of programmable phase modulation resolution, enabling phase shifting of the output in increments of 11.25°.
- What are the loading formats for the frequency tuning and control words?
The frequency tuning, control, and phase modulation words can be loaded asynchronously via parallel or serial loading formats.
- What is the power dissipation of the AD9851BRSZ at maximum clock rate?
The AD9851BRSZ has a power dissipation of 555 mW at the maximum clock rate of 180 MHz with a 5 V supply.
- What is the operating temperature range of the AD9851BRSZ?
The AD9851BRSZ operates over an extended industrial temperature range of –40°C to +85°C at >3.0 V supply voltage.
- In what package type is the AD9851BRSZ available?
The AD9851BRSZ is available in a 28-lead SSOP surface-mount package.
- What are some common applications of the AD9851BRSZ?
The AD9851BRSZ is used in agile-clock generator applications, frequency synthesis in communication systems, phase modulation, test and measurement equipment, and wireless communication systems.
- How does the AD9851BRSZ generate low jitter output pulses?
The AD9851BRSZ generates low jitter output pulses using its internal high-speed comparator, which can be configured to accept the externally filtered output of the DAC.
