Analog Devices Releases Low-power Single-supply ADC Drivers For Low-voltage, 14-bit Converters

The new ADC drivers feature one of the industry’s lowest noise specification of 1.2 nV/rt-Hz and low distortion in the frequency range of 20 MHz to 100 MHz. The combination of low noise and low distortion ensures more accurate measurement and signal representation for 14-bit ADCs used in electronic test and measurement equipment, data acquisition systems, wireless direct-conversion receivers and other wideband applications with data throughput of 40 MSPS (million samples per second) to 200 MSPS.

The ADA4930-1 and ADA4930-2 ultra-low-noise ADC drivers feature a 0.9-V output common mode voltage and are ADI’s first single-supply ADC drivers capable of driving the input of a dc-coupled, 1.8-V ADCs all the way to ground. This eliminates the second voltage supply required by other ADC drivers and reduces cost, power use and board space. The ADA4930-2 dual-channel ADC driver works well with ADI’s AD9640 dual ADC, while the ADA4930-1 single-channel ADC driver is suited to operate with ADI’s AD9255 single ADC.

“The ADA4930 ADC driver offers one of the lowest input-voltage noise specifications of any high-frequency ADC driver at a third less power consumption than competing products,” said Jim Doscher, product line director, High Speed Linear Products, Analog Devices. “For analogue circuit designers who need dc-coupled ADC signal paths for their high-frequency designs, the ADA4930 series drives high fidelity signals at a much wider bandwidth than competing devices, while removing the need for a second power supply.”

Key features of the ADA4930 Ultra-low-noise ADC Drivers:

* 1.2-nV/√Hz input voltage noise
* 1.8-V, 3.3-V or 5-V single-supply operation
* 0.9-V common-mode output on single supply
* Low harmonic distortion of -103 dBc HD2 @ 10 MHz to -75 dBc HD2 @ 100 MHz
* -3 dB bandwidth of 1.35 GHz at Gain = 1
* Differential-to-differential or single-ended-to-differential operation