Summary of Analog Devices’ Broadband Quadrature Modulator Is Industry’s First to Integrate Automatic Gain Control : – ADI’s ADL5386 provides a complete solution for cable and wireless infrastructure applications.
The ADL5386 is a wideband variable gain amplifier designed for next-generation communication infrastructure. Operating from 50 MHz to 2200 MHz, it supports high-data-rate complex modulation like 64 QAM. This integrated device combines a voltage variable attenuator and a 25-dB dynamic range output power detector to enable automatic level control (ALC) or automatic gain control (AGC). Its high linearity and low noise floor reduce the need for calibration, while its compact footprint saves board space compared to discrete solutions. It interfaces directly with ADI's AD977x TxDAC+ family.
Parts used in the ADL5386 Project:
- ADL5386 Variable Gain Amplifier
- Voltage Variable Attenuator (VVA)
- 25-dB Dynamic Range Output Power Detector
- Automatic Level Control (ALC) Loop
- Automatic Gain Control (AGC) Loop
- ADI AD977x Family TxDAC+
NORWOOD, Mass. (PRWEB) October 28, 2008
Operating over a 50-MHz to 2200-MHz frequency range, the ADL5386 supports high-data-rate complex modulation for next-generation communication infrastructure equipment. Functionally complete, the ADL5386 integrates a 25-dB dynamic range output power detector and a VVA (voltage variable attenuator). Together, they form a closed-loop automatic level control (ALC) or AGC, enabling the ADL5386 to accurately set the output power to a user determined level. The ADL5386 provides a complete subsystem within a small footprint, saving considerable board space, component cost, and circuit complexity over discrete implementations.
ADL5386 Eases Broadband High-Data-Rate Next-Generation Radio Applications
The ADL5386 provides exceptional output dynamic range due to its high output power capability (+10 dBm P1dB), high single-ended output linearity (+24 dBm IP3), and low noise floor (160 dBm/Hz). The 38 dBm carrier feedthrough and 46 dBc sideband suppression at 350 MHz minimizes the need for calibration and nulling in complex high-order modulation applications such as 64 QAM (quadrature amplitude modulation) and greater.
The ADL5386 wideband inputs (dc to 700 MHz) are compatible with the output levels of ADI’s AD977x family of TxDAC+
- What frequency range does the ADL5386 support?
The device operates over a 50-MHz to 2200-MHz frequency range. - How does the ADL5386 achieve accurate output power setting?
It integrates a VVA and a 25-dB dynamic range output power detector to form a closed-loop ALC or AGC system. - Can the ADL5386 handle complex modulation applications?
Yes, it supports high-order modulation such as 64 QAM due to its sideband suppression and carrier feedthrough characteristics. - What are the key performance metrics of the ADL5386?
It offers +10 dBm P1dB output power, +24 dBm IP3 linearity, and a 160 dBm/Hz noise floor. - Does the ADL5386 require significant calibration?
No, its specifications minimize the need for calibration and nulling in complex applications. - What input frequencies are compatible with the ADL5386?
The wideband inputs cover dc to 700 MHz. - Which DAC family is compatible with the ADL5386 inputs?
The inputs are compatible with the output levels of ADI's AD977x family of TxDAC+. - What advantages does the ADL5386 offer over discrete implementations?
It provides a complete subsystem that saves considerable board space, component cost, and circuit complexity.
