Differential RF/IF amplifier claims best-in-class performance for driving high-speed data converters

June 08, 2011 // By Paul Buckley
Analog Devices has introduced a differential RF/IF (radio frequency/intermediate frequency) amplifier for driving high-speed 12-bit to 18-bit A/D converters. The ADL5565 differential amplifier features 3-dB bandwidth of 5 GHz and achieves unprecedented distortion, noise and IP3/IP2 performance out to 300 MHz.

The ADL5565 amplifier is optimized for wide bandwidth, low distortion and low noise, and achieves industry-best HD3 and OIP3 distortion levels (–103 dB and 51 dBm at 100 MHz; –95 dB and 47 dBm at 200 MHz). The distortion performance makes the ADL5565 ideal for applications in which high linearity and low noise are critical, including IF sampling receivers in wireless infrastructure applications, industrial instrumentation and defense electronics.

The ADL5565 amplifier drives best-in-class high-speed converters, including ADI’s latest 16-bit, 250-MSPS AD9467 data converter, with little or no impact on overall A/D converter SFDR (spurious-free dynamic range) or IMD (inter-modulation distortion) performance. The device gain is pin-programmable using internal gain resistors, which allows for fixed gains of 6 dB, 12 dB, or 15.5 dB. With only two external input resistors, any gain between 0 dB and 15.5 dB can be easily realized, making the new amplifier easier to configure and more cost effective than traditional operational amplifiers.

The ADL5565 differential amplifier delivers the industry’s best HD2 and HD3 up to 200 MHz; no other amplifier today can come close to achieving the same distortion levels for the same power dissipation.

In addition to the HD2 and HD3 performance, the ADL5565 also has an industry-leading output (RTO) noise level of 5.5-nV/rt-Hz. The nominal operating power supply is 3.3 V, but the ADL5565 amplifier will also support 5 V for incremental distortion improvement. For time-domain applications, the ADL5565 can achieve 12-V/ns slew rates and 2-ns settling times to 1 percent for a 3-V step.

The ability of the ADL5565 amplifier to support detailed specifications at common IF frequencies (70 MHz, 100 MHz, 140 MHz, and 250 MHz) simplifies the design process and affords manufacturers a highly flexible design that can reduce time-to-market, bill-of-materials cost and board space. These new benchmarks in high-frequency distortion and noise levels allow system designers to continue increasing bandwidth and dynamic range for high-performance receiver designs.

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