400 MHz TO 6 GHz Broadband Quadrature Modulator
The ADL5375 is a broadband quadrature modulator designed for operation from 400 MHz to 6 GHz. Its excellent phase accuracy and amplitude balance enable high performance intermediate frequency or direct radio frequency modulation for communication systems.
The ADL5375 features a broad baseband bandwidth, along with an output gain flatness that varies no more than 1 dB from 450 MHz to 3.8 GHz. These features, coupled with a broadband output return loss of <−14 dB, make the ADL5375 ideally suited for broadband zero IF or low IF-to-RF applications, broadband digital predistortion transmitters, and multiband radio designs.
The ADL5375 accepts two differential baseband inputs and a single-ended LO. It generates a single-ended 50 Ω output. The two versions offer input baseband bias levels of 500 mV (ADL5375-05) and 1500 mV (ADL5375-15).
The ADL5375 is fabricated using an advanced silicon-germanium bipolar process. It is available in a 24-lead, exposed paddle, Pb-free, LFCSP_VQ package. Performance is specified over a −40°C to +85°C temperature range. A Pb-free evaluation board is also available.
- Cellular communication systems
GSM/EDGE, CDMA2000, W-CDMA, TD-SCDMA
- WiMAX/broadband wireless access systems
- Satellite modems
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ADL5375-15-EVALZ is a fully populated, 4-layer, FR4-based evaluation board. For normal operation, it requires a 5 V/500 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 1.5 V) are applied to edge-mounted SMA-type RF connectors. The ADL5375 output drives the ADL5320 driver amplifier with its output is available at the SMA connector labeled AMP_OUT. The ADL5375's output can be accessed directly at the SMA connector labeled AMP_IN/SMA_OUT (remove R2 and install zero ohms in R1). The evaluation board also includes options to drive the LO differentially through a balun along with pads that can be used to implement a harmonic filter in the LO path.
Recommended Differential Dual Baseband TxDAC's
- 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 higher bandwidths using data rates up to 250MSPS, with low noise and IMD , we recommend the AD9747, AD9125 or the AD9125 .
- For generating differential I and Q currents up to 125MSPS , we recommend the AD9117 .
- For ultrlow noise and IMD at 1000MSPS , we recommend the AD9125, AD9122, AD9122, AD9125 or the AD9146 .
Recommended Low-Noise Voltage Regulators
- For a fixed 5V, 500mA low dropout regulator with reverse current protection , we recommend the ADP7104 .
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