Overview
The AD9850BRS, produced by Analog Devices Inc., is a highly integrated CMOS device that utilizes advanced Direct Digital Synthesis (DDS) technology. This component combines a high-speed, high-performance D/A converter and a comparator to form a complete, digitally programmable frequency synthesizer and clock generator. When referenced to an accurate clock source, the AD9850BRS generates a spectrally pure, frequency/phase programmable analog output sine wave. This sine wave can be used directly as a frequency source or converted to a square wave for agile-clock generator applications.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Clock Input Frequency Range (5V Supply) | 1 | - | 125 | MHz |
| Clock Input Frequency Range (3.3V Supply) | 1 | - | 110 | MHz |
| Pulse Width High/Low (5V Supply, 25°C) | - | 3.2 | - | ns |
| Pulse Width High/Low (3.3V Supply, 25°C) | - | 4.1 | - | ns |
| DAC Resolution | - | - | - | 10 bits |
| Full-Scale Output Current (RSET = 3.9 kΩ, 25°C) | - | - | 10.24 | mA |
| Full-Scale Output Current (RSET = 1.95 kΩ, 25°C) | - | - | 20.48 | mA |
| Operating Temperature Range | -40 | - | 85 | °C |
| Power Dissipation (Typical, 3.3V Supply) | - | - | 155 | mW |
| Tuning Word Width | - | - | - | 32 bits |
| Package Type | - | - | - | 28-lead SSOP |
Key Features
- 125 MHz clock rate with a 32-bit frequency tuning word, providing an output tuning resolution of 0.0291 Hz with a 125 MHz reference clock.
- On-chip high-performance D/A converter and high-speed comparator.
- Simplified control interface with parallel byte or serial loading format.
- Phase modulation capability with five bits of digitally controlled phase modulation.
- Low jitter TTL/CMOS compatible output square wave generation.
- Operating temperature range of -40°C to +85°C.
- Low power dissipation of 155 mW (3.3V supply).
- Space-saving 28-lead SSOP package.
Applications
- Frequency synthesis and clock generation in various electronic systems.
- Agile-clock generator applications.
- Phase-locked loops and frequency modulation systems.
- Test and measurement equipment.
- Wireless communication systems requiring precise frequency control.
Q & A
- What is the AD9850BRS?
The AD9850BRS is a CMOS, 125 MHz Complete DDS Synthesizer produced by Analog Devices Inc.
- What is the maximum clock input frequency for the AD9850BRS?
The maximum clock input frequency is 125 MHz for a 5V supply and 110 MHz for a 3.3V supply.
- What is the resolution of the D/A converter in the AD9850BRS?
The D/A converter has a resolution of 10 bits.
- How is the frequency tuning word loaded into the AD9850BRS?
The frequency tuning word can be loaded via a parallel byte or serial loading format.
- What is the operating temperature range of the AD9850BRS?
The operating temperature range is -40°C to +85°C.
- What is the power dissipation of the AD9850BRS?
The typical power dissipation is 155 mW at a 3.3V supply.
- What package type is the AD9850BRS available in?
The AD9850BRS is available in a 28-lead SSOP package.
- Can the AD9850BRS generate a square wave output?
Yes, the AD9850BRS can generate a low jitter TTL/CMOS compatible output square wave using its high-speed comparator.
- What is the phase modulation capability of the AD9850BRS?
The AD9850BRS has five bits of digitally controlled phase modulation, allowing phase shifts in increments of 180°, 90°, 45°, 22.5°, 11.25°, and any combination thereof.
- Is the AD9850BRS RoHS compliant?
No, the AD9850BRS is not RoHS compliant, but there are RoHS-compliant versions available in some variants.
