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High-speed A/D converter duo boasts true 16- and 14-bit resolution

Norwood, Mass. — Analog Devices Inc. (ADI) is launching two high-resolution analog-to-digital converters (A/D converters) with fast sampling rates that it claims achieve best-in-class SFDR and SNR specs.

The 16-bit (AD9446) achieves a 10x increase in sample rates (100 Msamples/s) over other competing A/D converters, while offering 90-dBc spurious-free dynamic range (SFDR) and 80-dBfs signal-to-noise ratio (SNR) at baseband”a full 6 dB better than the closest competitor, according to John Hussey, vice president of the High Speed Converter Group at ADI. The converter is also available in an 80-Msample/s speed-grade option that achieves 85-dBc SFDR and 82-dBfs SNR.

For high-performance test and measurement applications that use digital time sampling for frequency and time domain analysis, the AD9446 significantly lowers aperture jitter to 60 femtoseconds (fs), Hussey said. Other applications include military and aerospace communication systems, high-end medical devices, and other industrial and instrumentation applications.

The highly accurate converter features typical 16-bit differential nonlinearity (DNL) of ±0.5 least significant bit (LSB) and typical integral nonlinearity (INL) of ±3 LSB. It includes an output clock, which simplifies the interface to digital-processing components and reduces the potential for digital noise coupling back into the A/D converter core.

The 14-bit converter (AD9445) is optimized to capture weak signals in noisy environments while simplifying basestation receiver designs. It provides SFDR above 80 dBc and a SNR of 72.5 dBfs at input frequencies up to 300 MHz. That's better than competing solutions by a full 10 dB and 4 dB, respectively, said Kevin Kattmann, ADI's product line director in the High Speed Converter Group.
“Only by pushing the SNR, SFDR and sample rate of the AD9445 were we able to unlock a simplified analog filter topography that increases overall basestation receiver performance while reducing cost, time and complexity,” Kattmann said.

In addition, the AD9445 provides high dc accuracy, with typical DNL of ±0.2 LSB and INL of ±1.0 LSB. The A/D converter also features a flexible input range up to 3.2 volts peak to peak. The device includes an on-chip reference and track-and-hold, and also achieves an aperture jitter of 60 fs.

In addition to multicarrier, multimode receivers, the AD9445 is suitable for antenna array positioning, power amplifier linearization, broadband wireless, radar and infrared imaging, medical imaging, communications instrumentation, and software-defined and cognitive radios.

Both devices feature parallel, low-voltage differential signaling (LVDS) outputs. The AD9445-125 and AD9445-105 are supported by two evaluation boards and a behavioral model that can be used with Analog Devices' ADIsimADC modeling software.

All of the A/D converters are sampling now, with production quantities slated for September. Available in a 100-lead TQFP/EP, the AD9446-100 and AD9446-80 are priced at $79.90 and $72.25, each in 1,000-unit quantities, respectively. Click here for the AD9446 data sheet.

Pricing for the AD9445-125 and AD9445-105 is $59.50 and $49.30, respectively, in like quantities. Click here for the AD9445 data sheet.

Analog Devices , 1-800-262-5643, www.analog.com.

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