Overview
The AD9854AST, produced by Analog Devices Inc., is a highly integrated digital synthesizer that leverages advanced Direct Digital Synthesis (DDS) technology. This device is designed to generate highly stable, frequency-phase, and amplitude-programmable sine and cosine outputs. It is particularly useful in applications requiring agile local oscillators (LOs) in communications, radar, and other similar fields. The AD9854AST operates on a single 3.3 V supply and is fabricated using 0.35 µm CMOS technology, ensuring high functionality and reliability over an extended industrial temperature range of −40°C to +85°C.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Frequency Resolution | - | 1 μHz | - | - |
| System Clock Frequency | - | 300 MHz | - | - |
| Output Frequency Range | - | Up to 150 MHz | - | - |
| Phase-to-Amplitude Conversion Bits | - | 16 bits | - | - |
| I and Q DAC Bits | - | 12 bits | - | - |
| Phase Registers Bits | - | 14 bits | - | - |
| Supply Voltage | 3.15 V | 3.3 V | 3.45 V | V |
| Operating Temperature Range | -40°C | - | +85°C | °C |
Key Features
- Advanced DDS technology with 48-bit frequency resolution and 1 μHz tuning resolution.
- Two internal high-speed, high-performance quadrature DACs for generating sine and cosine outputs.
- Simultaneous quadrature output signals up to 150 MHz with a tuning rate of up to 100 million new frequencies per second.
- Internal comparator for converting sine wave outputs to square waves, suitable for agile clock generator applications.
- Programmable amplitude modulation, on/off output shaped keying, and precise amplitude control of the quadrature output using 12-bit digital multipliers.
- Chirp functionality for wide bandwidth frequency sweeping applications.
- Programmable 4× to 20× REFCLK multiplier circuit to generate the 300 MHz system clock from an external lower frequency reference clock.
- Single-pin conventional FSK and enhanced spectral qualities of ramped FSK supported.
Applications
- Communications systems requiring agile local oscillators (LOs).
- Radar systems for frequency agility and precision.
- High-speed clock generator applications with static duty cycle control.
- Wide bandwidth frequency sweeping applications such as in test and measurement equipment.
- Phase-shift keying (PSK) modulation schemes, including BPSK and higher-order PSK operations.
Q & A
- What is the primary function of the AD9854AST? The AD9854AST is a digital synthesizer that generates highly stable, frequency-phase, and amplitude-programmable sine and cosine outputs using advanced DDS technology.
- What is the frequency resolution of the AD9854AST? The AD9854AST has a frequency resolution of 1 μHz with a 48-bit frequency resolution and a 300 MHz system clock frequency.
- What is the maximum output frequency range of the AD9854AST? The AD9854AST can generate output frequencies up to 150 MHz.
- How many bits are used for phase-to-amplitude conversion in the AD9854AST? The AD9854AST uses 16 bits for phase-to-amplitude conversion.
- What is the supply voltage range for the AD9854AST? The AD9854AST operates on a single 3.3 V supply with a range of 3.15 V to 3.45 V.
- What are the key applications of the AD9854AST? The AD9854AST is used in communications, radar, high-speed clock generator applications, and wide bandwidth frequency sweeping applications.
- Does the AD9854AST support phase-shift keying (PSK) modulation? Yes, the AD9854AST supports PSK modulation, including BPSK and higher-order PSK operations.
- How does the AD9854AST generate its system clock? The AD9854AST can generate its 300 MHz system clock internally using a programmable 4× to 20× REFCLK multiplier circuit from an external lower frequency reference clock.
- What is the operating temperature range of the AD9854AST? The AD9854AST operates over an extended industrial temperature range of −40°C to +85°C.
- Can the AD9854AST be used for agile clock generator applications? Yes, the AD9854AST can be used for agile clock generator applications, including static duty cycle control using its internal comparator.
