High-speed multichannel ADCs reduce system board space
Quad 12-bit parts use 50% less PCB area for high-bandwidth data acquisition applications
The four-channel 12-bit AD9239 and AD9639 A/D converters are claimed by the company to use 50% less printed-circuit-board surface area than other ADCs in their class, which makes them suitable for high-speed signal-processing applications including cable infrastructure and point-to-point wireless communications equipment and spectrum analyzers. The quad parts require only eight pins and traces, compared to as many as 26 in competing dual-channel devices.
In addition, they are also offered as the first to feature an on-chip temperature sensor. The 250-Msample/s AD9239 incorporates an efficient packetized output scheme, while the 210-Msample/s AD9639 supports a JESD204-compliant output scheme.
Both ADCs feature on-chip PLL and input buffer circuits, a single 1.8-V power supply, and a power dissipation of 1.5 W in normal mode and 145 mW per channel typ when standby mode is enabled with the digital link remaining in operation. Housed in a 72-lead LFCSP, the chips also achieve an SNR of 65 dBFs, an SFDR of 77 dBc and an ENOB of 10.5, all at an 85-MHz input frequency. (From $119 ea/1,000 — available now.)
Analog Devices , Wilmington , MA
Technical Support 800-262-5643
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