Analog Devices has introduced a differential radio frequency and intermediate frequency amplifier to drive 12 to 18bit ADCs. The company claims that the ADL5565 differential amplifier is optimised for wide bandwidth, low distortion and low noise. It attains output intercept point distortion levels of -103dB and 51dBm at 100MHz and -95dB and 47dBm at 200 MHz. The distortion performance makes the amplifier suitable for wireless infrastructure applications, industrial instrumentation and defence electronics.
The amplifier drives the company's 16bit, 250Msamples/s AD9467 data converter with little or no impact on overall ADC spurious-free dynamic range or inter-modulation distortion performance. The device gain is pin-programmable using internal gain resistors, which allows for fixed gains of 6, 12, or 15.5dB. With only two external input resistors, any gain between 0 and 15.5dB can be realised and enables in convenient configuration.
The amplifier has an output noise level of 5.5-nV/rt-Hz. It operates at a power supply of 3.3V, but the amplifier will also support 5V for incremental distortion improvement. For time-domain applications, the amplifier can achieve 12V/ns slew rates and 2ns settling times. The company claims that the ability of the amplifier to support detailed specifications at common IF frequencies enables manufacturers to reduce time-to-market, bill-of-materials cost and board space.
