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Converters deliver specs for wireless apps

Norwood, Mass. — Analog Devices Inc. unveiled a family of low-power 14- and 12-bit analog-to-digital converters for wireless infrastructure applications.

The AD9246 is the first 14-bit, 125 megasample/second A/D converter to achieve spurious-free dynamic range (SFDR) of 85 dBc at a 70 MHz input, said Kevin Kattmann, product line director, High Speed Signal Processing group, Analog Devices.

In addition to the highest SFDR in its class, the AD9246 provides signal-to-noise ratio (SNR) of 72.25 dB full scale (fs) at a 70 MHz input and 395 mW of power, enabling high-quality conversion of the most demanding third-generation wireless standards at the lower voltage levels required to reduce power consumption, Kattmann said. “This combination of speed, resolution, intermediate frequency (IF) performance, and power makes the AD9246 ideal for smaller wireless infrastructure systems, such as micro and picocell basestations,” he said.

The 14-bit, 125 Msample/s AD9246 is the flagship product in ADI's new 1.8-V core family of 12- and 14-bit, 105- and 125-Msample/s A/D converters. In addition to the AD9246, this family includes the 14-bit, 105-Msample/s AD9246; the 12-bit, 125 Msample/s AD9233; and the 12-bit, 105 Msample/s AD9233.

The AD9246 provides SFDR of 75 dBc and SNR of 70.2 dB fs at an input frequency of 280 MHz. The device's high IF sampling and high sampling rate simplify system design and reduce cost making it practical for third-generation communications receivers like CDMA2000, UMTS and TD-SCDMA, Kattmann said. The converter can also be used in the digital pre-distortion observation path where high-sampling rates enable the digitization of higher order inter-modulation distortion products.

The AD9246 also features a high-performance sample-and-hold amplifier (SHA) and on-chip voltage reference. The patented SHA maintains excellent performance for input frequencies up to 280 MHz, can be configured for single-ended or differential operation, and has a selectable input voltage range.

 
 
See AD9246 block diagram

The 14-bit, 125/105 Msample/s AD9246 and 12-bit, 125/105 Msample/s AD9233 A/D converters are sampling now with production slated for February. The devices, offered in a 7mm x 7mm LFCSP, are specified over the extended industrial temperature range of -40°C to +85°C.

The 125 Msample/s AD9246, 105 Msample/s AD9246, 125 Msample/s AD9233 and 105 Msample/s AD9233 are respectively priced at $48.50, $39.95, $26.95 and $22.75 per unit in 1,000-piece quantities. Click here for the AD9246 data sheet. Click here for the AD9223 data sheet.

Analog Devices , 1-800-262-5643, www.Analog.com.

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