Norwood, Mass. - Analog Devices Inc. has launched what it claims is the fastest 12-bit A/D converter available, the 210-Msample/second AD9430. Kevin Kattmann, product line director for high-speed converters, said the part is nearly 70 percent faster than its predecessor, the 12-bit AD9433. The part targets future cable modem services, third-generation (3G) radio transceivers, point-to-point radios and medical-imaging systems.
Kattmann noted that the Euro-Docsis (data over cable service interface specification) standard uses a larger return-path spectrum than the North American Docsis standard. Thus, it requires higher-performance data converters. The new converter enables a universal analog front end for reverse-path deployment, eliminating the need to design different systems for different regional markets, he said. Digitizing the cable return path increases overall cable plant reliability by eliminating temperature drift and other traditional analog effects, he said.
"Digitizing the return path also simplifies maintenance, since systems can use multisourced, standards-based digital components," Kattmann added. "This product achieves the performance required to deliver higher-order modulation schemes so that cable service providers can offer new revenue-generating services."
The converter's sample rates enable designers to increase data rates in radio point-to-point systems by migrating to high orders of modulation, with higher spectral requirements, or by increasing spectrum bandwidth to 105 MHz. "In cellular infrastructure transmit systems, the AD9430 can be used to take advantage of 3G digital pre-distortion techniques that require digitization of the entire multicarrier-transmitted spectrum in a band up to 70 MHz," Kattmann said.
The AD9430 is a single-chip sampling A/D with an on-chip track-and-hold circuit. It has a 64-dB signal-to-noise ratio up to 65 MHz at 210 Msamples/s and an 80-dBc spurious free dynamic range up to 65 MHz at 210 Msamples/s. Integral nonlinearity is typically 1.5 least significant bit (LSB) and differential nonlinearity is 1 LSB. Power dissipation is typically 1.3 W at 210 Msamples/s.
Users can select a twos complement or an offset binary output data format, and can select CMOS or low-voltage differential signaling-compatible outputs. In CMOS mode, two output buses support de-multiplexed data up to 110 Msamples/s at 3.3 volts.
Two versions are available, each in a 100-pin thin QFP with exposed heat sink paddle (epad TQFP). The 170-Msample/s AD9430BSV-170 is in production, priced at $75 in 1,000-piece quantities. The 210-Msample/s AD9430BSV-210 is priced at $91 in 1,000-piece quantities.
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