Driver for 14- and 16-bit ADC

23 July 2008 Analogue, Mixed Signal, LSI

Analog Devices has extended its family of differential amplifiers by introducing a new device with excellent distortion performance at low power consumption for engineers who need high performance when driving high-resolution ADCs (analog-to-digital converters) in communications infrastructure, instrumentation and other high-speed equipment.

Optimised to drive high-performance 14- and 16-bit converters, the ADA4939 differential amplifier consumes less than 120 mW of power on a single 3,3 V supply, while achieving 82 dB SFDR (spurious-free dynamic range) at 70 MHz. It is available in one- and two-channel versions in the forms of the ADA4939-1 and ADA4939-2, respectively.

The ADA4939 can be used in either differential-to-differential or single-ended- to-differential configurations. An internal common-mode feedback loop allows the user to independently adjust the output common-mode level to match the input common mode voltage of the ADC, and at the same time achieve exceptional output balance and suppression of even-order harmonics.

The ADA4939 is especially well suited to communications applications, such as cellular base stations using low IF (intermediate frequency) and baseband signal processing at frequencies up to 100 MHz, and where 14- and 16 bit accuracy is required. The two-channel version is ideal for driving dual ADCs used in I/Q demodulation schemes. It offers low cross-talk of -80 dB at 100 MHz while providing gain and phase matching.

The ADA4939 is fabricated using ADI's proprietary silicon-germanium (SiGe) complementary bipolar process, enabling it to achieve very low levels of distortion with an input voltage noise of 2,3 nV/rt Hz, as well as -3 dB bandwidth of 1,4 GHz (G = +2) and a slew rate of 5000 V/μs. The ADA4939 is specified to operate over the -40°C to +105°C temperature range for both 3,3 V and 5 V operation.

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