Overview
The AD9853AS from Analog Devices Inc. is a highly integrated programmable digital QPSK/16-QAM modulator designed for various network applications. This device combines a high-speed direct-digital synthesizer (DDS), a high-performance digital-to-analog converter (DAC), digital filters, and other DSP functions on a single chip. It is particularly suited for applications where cost, size, power dissipation, functional integration, and dynamic performance are critical. The AD9853AS operates on a single supply voltage of +3.3 V to +5 V and is fabricated using an advanced CMOS process, ensuring low power consumption and a small footprint.
Key Specifications
| Parameter | Min | Typ | Max | Units |
|---|---|---|---|---|
| Reference Clock Frequency Range (6× REFCLK Disabled, +3.3 V Supply) | 42 | - | 126 | MHz |
| Reference Clock Frequency Range (6× REFCLK Enabled, +3.3 V Supply) | 7 | - | 21 | MHz |
| Reference Clock Frequency Range (6× REFCLK Disabled, +5 V Supply) | 108 | - | 168 | MHz |
| Reference Clock Frequency Range (6× REFCLK Enabled, +5 V Supply) | 18 | - | 28 | MHz |
| Duty Cycle (+25°C) | 40 | 50 | 60 | % |
| Input Capacitance (+25°C) | - | - | 3 | pF |
| Power Consumption (@ Full Clock Speed, 3.3 V Supply) | - | - | 750 | mW |
| Operating Temperature Range | -40 | - | +85 | °C |
Key Features
- High-speed direct-digital synthesizer (DDS) and high-performance digital-to-analog converter (DAC).
- Integrated Reed-Solomon FEC function and programmable randomizer/preamble function.
- Internal SINx/x compensation and controlled burst mode operation.
- Low power consumption: 750 mW at full clock speed with a 3.3 V supply.
- Space-saving surface mount packaging (32-WFQFN Exposed Pad).
- Programmable I/Q channel spectrum and preamble insertion.
- Direct interface port to the AD8320, digitally-programmable cable driver amplifier.
Applications
- Interactive HFC (Hybrid Fiber Coaxial) networks.
- Wireless LAN (WLAN) applications.
- MMDS (Multichannel Multipoint Distribution Service).
- Telephony and video modems.
- General purpose modulator applications.
Q & A
- What is the primary function of the AD9853AS?
The AD9853AS is a programmable digital QPSK/16-QAM modulator designed for network applications.
- What are the key components integrated into the AD9853AS?
The device integrates a high-speed DDS, a high-performance DAC, digital filters, and other DSP functions.
- What is the operating voltage range of the AD9853AS?
The AD9853AS operates on a single supply voltage of +3.3 V to +5 V).
- What is the typical power consumption of the AD9853AS at full clock speed?
The typical power consumption is 750 mW at full clock speed with a 3.3 V supply).
- What is the operating temperature range of the AD9853AS?
The operating temperature range is –40°C to +85°C).
- What types of applications is the AD9853AS suited for?
The AD9853AS is suited for interactive HFC, WLAN, MMDS, telephony, and video modems, as well as general purpose modulator applications).
- Does the AD9853AS support FEC and randomizer functions?
Yes, it supports Reed-Solomon FEC and programmable randomizer/preamble functions).
- What is the package type of the AD9853AS?
The AD9853AS is available in a 32-WFQFN Exposed Pad surface mount package).
- Can the AD9853AS be used with other Analog Devices components?
Yes, it has a direct interface port to the AD8320, digitally-programmable cable driver amplifier).
- What is the significance of the SINx/x compensation in the AD9853AS?
The SINx/x compensation helps in maintaining high performance and reducing distortion in the output signal).
