Analog Devices announced the release of the AD9224 and AD9225, two monolithic, single-supply, 12-bit analog-to-digital converters (ADC) that uniquely combine a low-cost, high-speed CMOS process and novel multi-stage differential pipelined architecture with output error correction logic. As a result, the AD9224 and AD9225 provide 12-bit accuracy at 40- and 25- MSPS data rates, respectively, while guaranteeing no missing codes. The AD9225 and AD9224 are the latest members of the AD922x family of pin-compatible, 12-bit ADCs from ADI (with sampling rates from 1 to 40 MSPS) that have been designed into a wide variety of communications, imaging and other applications.

"The AD9225, with its 11.4 bits ENOBs, delivers true 12-bit performance at 25 MSPS with ultra-low power," according to John Hussey, Product Line Director for ADI's High-Speed Converter Group. "The AD9224 extends the performance of our popular 12-bit line of A/D converters to 40 MSPS, a frequency critical in IF undersampling and ultrasound applications."

Click here for table that shows specs for both AD9224 and AD9225.

These specifications make the AD9224 and AD9225 well-suited for a wide range of applications, including the following:

These represent the next jump in 12-bit performance and are well-priced for a market that is generally, in fact, not that price sensitive. Although I personally think that quoting single numbers for Spurious Free Dynamic Range (SFDR), such as is given here, should be a capital offence going to the data sheets it does look like the performance will satisfy many base station designer requirements; although it is essential for a designer to check a particular product in their own very individual circumstances. The Effective number of bits number in the table for the AD9224 is, I think a typo and should be 10.9. THD numbers for both parts are extremely good.

The 40 Msample/s performance level is a critical one for getting parts into the IFs of products and doing away with a lot of low-frequency conversion needs in those products. The AD9224 will do extremely well in those applications but I would suspect that the AD9225 will be in the "also ran" category unless it is cleverly marketed in the xDSL arena or for an obvious, but not mentioned, video market requirement. Both parts are in 28-pin SSOPs and are priced at $18.66 for the AD9224 and $15.35 for the AD9225, both in 1000-piece lots.