ADC Drivers from Analog Devices Complement Best Performing High-Speed ADCs

The ADI ADA4937-2 and ADA4938-2 differential drivers combine the low noise and distortion levels required to drive the high-speed ADCs found in today’s wireless infrastructure and instrumentation equipment. Ideal for single 3-V to 5-V power supplies, the ADA4937-2 achieves an industry-best distortion of –120/–102 dBc at 10 MHz, –98/–100 dBc at 40 MHz and –84/–90 dBc at 70 MHz. The ADA4938-2 works over a 5-V to 10-V supply range and achieves industry-leading distortion of –112/–108 dBc at 10 MHz, –96/–93 dBc at 30 MHz and –79/–81 dBc at 50 MHz in dual supply applications.

Featuring an internal common-mode feedback architecture, the ADA4937-2 and ADA4938-2 allow the output common-mode voltage to be controlled by an externally applied voltage. This function bridges any gap between the output range of the component before the ADC and the input range of the ADC, eliminating the need for ac coupling, and making the drivers well suited for dc-coupled applications, such as data-acquisition instruments and baseband communications systems.

Both the ADA4937-2 and the ADA4938-2 are fabricated using ADI’s proprietary silicon-germanium (SiGe) complementary bipolar process, enabling very low levels of distortion with an input voltage noise of only 2.2 nV/rt-Hz. The low dc offset and excellent dynamic performance of the ADA4937-2 make it well suited for a variety of data acquisition and signal processing applications.

The ADA4937-2 and the ADA4938-2 are ideally suited for use with Analog Devices’ AD9640/AD9627/AD9600 family, AD6655/53 family, and AD9248/38/16 family.