Manhasset, N.Y. Looking to strengthen its position in the wireless-infrastructure market, Analog Devices Inc. this week will launch a 14-bit analog-to-digital converter that's designed to meet the power and performance requirements of single-carrier basestation designs.
Earlier this year, Analog Devices unveiled the 14-bit AD9445 A/D for the multicarrier macrocell wireless-basestation market.
That converter delivered a spurious-free dynamic range (SFDR) of - 85 dBc at 225 MHz and a sampling rate of 125 Msamples/second. Now, with the release of the AD9246, ADI hopes to land design wins in picocell and microcell basestation architectures.
As wideband-CDMA wireless networks proliferate in cities worldwide, there is a growing need to roll out picocell and microcell basestations to fill in key coverage gaps in carrier networks. The trend is especially prevalent in the Asian markets, where carriers often use picocells, said Kevin Kattman, product line director at Analog Devices.
From a converter standpoint, the picocell and microcell markets, which are often single-carrier designs, require a different set of requirements.
Kattman said ADI developed the AD9246 in parallel with the AD9445 to meet the specific requirements of single-carrier designs.
"In the multicarrier basestation market, designers need the most performance they can get from an A/D," Kattman said. For single-carrier designs, however, issues such as power consumption play a much bigger role, he said.
To address the power consumption requirement, ADI moved the operating voltage of the AD9246 to 1.8 volts from the 3.3- to 5-V range used in the AD9445. The company also slashed power dissipation in the part, achieving a figure of 395 mW compared with more than 2 W for the AD9445.
But reducing power doesn't necessarily come at the expense of reduced performance. Like the AD9445, the AD9426 A/D sports a 125-Msample/s sampling rate (a 105-Msample/s version of the chip is also available). The chip can also achieve an SFDR of - 85 dBc, although from an input of 70 MHz as opposed to the input frequency of 225 MHz used by the AD9445.
The AD9246 features an on-chip sample-and-hold amplifier and on-chip voltage reference. The SHA can be configured for single-ended or differential operation and has a selectable input-voltage range.
The 14-bit AD9246 A/D is sampling now and is priced at $48.50 in 1,000-piece quantities for the 125-Msample/s version and $39.95 for the 105-Msample/s version. A 12-bit model, the AD9233, is available for $26.95 (125 Msamples/s) or $22.75 (105 Msamples/s) in 1,000-piece quantities. The AD9246 and AD9333 will enter production in February.