30 MHz TO 2200 MHz Quadrature Modulator
The ADL5385 is a silicon, monolithic, quadrature modulator designed for use from 30 MHz to 2200 MHz. Its excellent phase accuracy and amplitude balance enable both high performance intermediate frequency (IF) and direct radio frequency (RF) modulation for communication systems.
The AD5385 takes the signals from two differential baseband inputs and modulates them onto two carriers in quadrature with each other. The two internal carriers are derived from a single-ended, external local oscillator input signal at twice the frequency as the desired carrier output. The two modulated signals are summed together in a differential-to-single-ended amplifier designed to drive 50 Ω loads.
The ADL5385 can be used as either an IF or a direct-to-RF modulator in digital communication systems. The wide baseband input bandwidth allows for either baseband drive or drive from a complex IF. Typical applications are in radio-link transmitters, cable modem termination systems, and broadband wireless access systems.
The ADL5385 is fabricated using the Analog Devices, Inc., advanced silicon germanium bipolar process and is packaged in a 24-lead, Pb-free LFCSP_VQ with exposed paddle. Performance is specified over –40°C to +85°C. A Pb-free evaluation board is also available.
- Radio-link infrastructure
- Cable modem termination systems
- UHF/VHF radio
- Wireless infrastructure systems
- Wireless local loop
- WiMAX/broadband wireless access systems
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This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
ADL5385-EVALZ is a fully populated, 4-layer, FR4-based evaluation board. For normal operation, it requires a 5 V/300 mA power supply. The 5 V power supply should be connected to the clip leads labeled VPOS and GND. The LO and baseband inputs (which should be biased at 0.5 V) are applied to edge-mounted SMA-type RF connectors (labeled LO, IBBP, IBBN, QBBP, and QBBN). The ADL5385 output is available at the SMA connector labeled VOUT. DC voltage proportional to die temperature is available at the clip lead labeled TEMP.
Recommended Differential Dual Baseband TxDAC's
- For generating differential I and Q currents up to 125MSPS , we recommend the AD9117 .
- For higher bandwidths using data rates up to 250MSPS, with low noise and IMD , we recommend the AD9747, AD9125 or the AD9125 .
- For even lower power requirements up to 125MSPS , we recommend the AD9717 .
- For direct conversion transmit applications up to 500 MSPS , we recommend the AD9783, AD9122 or the AD9122 .
- For ultrlow noise and IMD at 1000MSPS , we recommend the AD9125, AD9122, AD9122, AD9125 or the AD9146 .
Recommended RF/IF Driver Amplifiers and Gain Blocks
- For the full listing of frequency and driving level options
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