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High-speed multi-channel ADCs reduce system board space

Norwood, Mass.—Analog Devices Inc. (ADI) introduced a pair of four-channel 12-bit analog-to-digital converters (ADCs) that it says uses 50 percent less printed-circuit-board surface area than other ADCs in its class.

The AD9239 and AD9639 quad ADCs require only eight pins and traces, compared to as many as 26 in competing dual-channel devices, which yields space savings in high-speed signal processing applications, including cable infrastructure and point-to-point wireless communications equipment and spectrum analyzers.

The 250-MSPS (mega-sample-per-second) AD9239 incorporates a packetized output scheme, while the 210-MSPS AD9639 supports a JESD204-compliant output scheme. Both ADCs feature on-chip PLL (phase-locked loop) and input buffer circuits, which are designed for low cost, low power, small size, and ease of use. The ADCs require a single 1.8-V power supply, dissipating 1.5 W in normal mode and 145 mW per channel (typical) when standby-mode is enabled with the digital link remaining in operation.

The AD9239 and AD9639 feature an on-chip temperature sensor, which allows engineers to conduct thermal monitoring for optimized system operation. The quad ADCs offer achieve SNR (signal-to-noise ratio) of 65 dBFs, SFDR (spurious-free dynamic range) of 77 dBc and an ENOB (effective number of bits) of 10.5, all at an 85-MHz input frequency.

Pricing: Ranges from $119 to $199.
Availability: Now.

Datasheets: AD9239 or AD9639.

Analog Devices, www.analog.com

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