Date: 22/11/2008

High-speed 12-bit multi channel ADC

Analog Devices introduced a pair of 4-channel 12-bit analog-to-digital converters (ADCs) that use 50 percent less printed-circuit-board surface area than other ADCs in their class. The AD9239 and AD9639 quad analog-to-digital converters occupy less space in high-speed signal processing applications, including cable infrastructure and point-to-point wireless communications equipment and spectrum analyzers.

1. Both are compatible with ADI's variable gain amplifiers, including the AD8372 and AD8376.
2. The 250-MSPS (mega-sample-per-second) AD9239 incorporates an efficient packetized output scheme.
3. The 210-MSPS AD9639 supports a JESD204-compliant output scheme.
4. 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.
5. They 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.
6. First high-speed ADCs to feature an on-chip temperature sensor, which allows engineers to conduct thermal monitoring for optimized system operation.
7. They offer high noise performance and 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.
8. Both support an LVDS (low-voltage differential signal)-compatible sample-rate clock input and provide four serial digital output streams with coded data from each ADC channel. Clock information is also coded into each serial stream so that the receiving logic can extract the necessary clocking information.
9. Operating temperature ranges from -40°C to +85°C

Pricing: (Each Per 1000 Packaging)
$199 for AD9239-250
$143 for AD9239-210 & AD9639-210
$119 for AD9239-170 & AD9639-170

Packaging: 72-lead LFCSP

For more information, visit our web page: www.analog.com