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Date: 10th Jun 2011

High performance differential RF/IF amplifier for driving high-speed ADC

Analog Devices, Inc. has introduced a RF/IF (radio frequency/intermediate frequency) differential RF/IF amplifier for driving high-speed 12-bit to 18-bit A/D converters. The ADL5565 differential amplifier features 3 dB bandwidth of 5 GHz. The ADL5565 amplifier is optimized for wide bandwidth, low distortion and low noise, and offers HD3 and OIP3 distortion levels of -103 dB and 51 dBm at 100 MHz; -95 dB and 47 dBm at 200 MHz. The suggested applications for ADL5565 includes IF sampling receivers in wireless infrastructure applications, industrial instrumentation and defense electronics where high linearity and low noise are critical.

The ADL5565 amplifier's 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, according to ADI.

The ADL5565 differential amplifier delivers 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, claims ADI.

ADL5565 has 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.

ADL5565 amplifier supports detailed specifications at common IF frequencies (70 MHz, 100 MHz, 140 MHz, and 250 MHz)

Availability: Now.
Price: $4.05 for 1K units 16-lead LFCSP, $10.98 for40-pin LFCSP
For more information, visit: www.analog.com/rf.

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