Two in one

Analog Devices is claiming an industry first with the introduction of a device that crams two 14-bit dual analog-to-digital converters (ADCs) on a single chip.

The converter is the flagship device in a new family of dual ADCs from the company that come in a range of resolutions and speeds.

Aside from the AD9248, the 14-bit member of the family that samples at speeds of 20 MSPS to 65 MSPS and has a power consumption of 300 mW per channel, the two other members of the family include the 12-bit dual AD9238, that runs at the same speed and sports the same power consumption as its 14-bit brother, and the 10-bit dual AD9216, which comes in speed grades ranging between 65 MSPS to 105MSPS and consumes 150 mW per channel.

All the devices feature dual high-performance sample-and-hold amplifiers (SHA) and an integrated voltage reference. They use a multistage differential pipelined architecture with output error correction logic to provide 10-, 12- and 14-bit accuracy, and guarantee no missing codes over the full operating temperature range (-40 degrees C to +85 degrees C) at up to the specified sample rate.

The wide bandwidth, differential SHA allows for a variety of user selectable input ranges and offsets, including single-ended applications. They are suitable for various applications including multiplexed systems that switch full-scale voltage levels in successive channels and for sampling inputs at frequencies well beyond the Nyquist rate (one-half the sample rate).

Pricing for the AD9216, AD9238 and AD9248 begins at $9.25, $13.15 and $22.95, respectively, in 1,000-piece quantities for the slowest speed grades.

The devices are sampling now with production quantities available in September 2004.

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