30 MHz TO 2 GHz Quadrature Demodulator
The ADL5387 is a broadband quadrature I/Q demodulator that covers an RF/IF input frequency range from 30 MHz to 2 GHz. With a NF = 13.2 dB, IP1dB = 12.7 dBm, and IIP3 = 32 dBm @ 450 MHz, the ADL5387 demodulator offers outstanding dynamic range suitable for the demanding infrastructure direct-conversion requirements. The differential RF/IF inputs provide a well-behaved broadband input impedance of 50 Ω and are best driven from a 1:1 balun for optimum performance.
Ultrabroadband operation is achieved with a divide-by-2 method for local oscillator (LO) quadrature generation. Over a wide range of LO levels, excellent demodulation accuracy is achieved with amplitude and phase balances ~0.05 dB and ~0.4°, respectively. The demodulated in-phase (I) and quadrature (Q) differential outputs are fully buffered and provide a voltage conversion gain of >4 dB. The buffered baseband outputs are capable of driving a 2 V p-p differential signal into 200 Ω.
The fully balanced design minimizes effects from second-order distortion. The leakage from the LO port to the RF port is <−70 dBc. Differential dc-offsets at the I and Q outputs are <10 mV. Both of these factors contribute to the excellent IIP2 specifications > 60 dBm.
The ADL5387 operates off a single 4.75 V to 5.25 V supply. The supply current is adjustable with an external resistor from the BIAS pin to ground.
The ADL5387 is fabricated using the Analog Devices, Inc. advanced silicon-germanium bipolar process and is available in a 24-lead exposed paddle LFCSP.
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
ADL5387-EVALZ is a fully populated, 4-layer, FR4-based evaluation board designed to allow easy evaluation of all of the features of the ADL5387. The evaluation board integrates bypassable transformers to allow single ended or differential baseband I and Q outputs and the evaluation board requires only a single supply within the range of 4.75 V to 5.25 V.
Recommended Baseband Driver Amplifiers
- For variable gain and programmable baseband filters , we recommend the ADRF6510 or the ADRF6516 .
- For selectable gains of 1, 2 or 3 , we recommend the ADA4950-1 or the ADA4950-2 .
- For low noise drivers in low voltage (1.8V) ADC applications , we recommend the ADA4930-1 or the ADA4930-2 .
- For a digital programmable VGA , we recommend the AD8366 .
- For a differential RF/IF amplifier , we recommend the ADL5562 or the ADL5565 .
Recommended Dual Analog-to-Digital Converters
- For 16-bit performance, low power and high sampling rate , we recommend the AD9268 or the AD9650 .
- For 14-bit performance, low power and high sampling rate , we recommend the AD9258 or the AD9251 .
- For 16-bit performance, continuous time sigma delta architecture with integrated QEC , we recommend the AD9262 .
- For 12-bit performance, low power, low cost and ease of use , we recommend the AD9231 .
- For 16-bit performance, multistage differential pipeline architecture with integrated quadrature error correction (QEC) , we recommend the AD9269 .
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The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.