Dual 14-bit analog-to-digital converter

BANGALORE: Data conversion technology provider Analog Devices Inc. today introduced the first dual 14-bit analog-to-digital converter (ADC) to achieve sampling rates of 150 mega samples per second (MSPS).

Supporting all third-generation (3G) base station wireless standards, including W-CDMA, CDMA2000 and TD-SCDMA, the AD9640 is the only dual 14-bit ADC that samples at rates beyond 135 MSPS, a common requirement for the emerging WiMax (Worldwide Interoperability for Microwave Access) standard, Analog Devices said in a statement.

Before the AD9640, sampling rates beyond 135 MSPS could only be realized by utilizing single-channel ADCs. With the AD9640, base station designers are able to reach higher sampling rates with one dual ADC, enabling a 50 percent reduction in board space requirements. Additionally, the AD9640 simplifies the design of multicarrier wireless infrastructure systems by decreasing the amount of analog filtering in front of the ADC and offering low power consumption.

“Today’s base station manufacturers are faced with designing for a variety of 3G wireless standards, as well as the emerging WiMAX standard, while also focusing on reducing costs,” said Kevin Kattmann, product line director, High Speed Signal Processing Group, Analog Devices. “Addressing this challenge, the AD9640 offers the performance and sample rate required for these standards, but also provides the low power, small size and digital features to lower overall system costs.”

The new ADC consumes 390 mW of power per channel. The AD9640 offers signal-to-noise ratio (SNR) of 72.7 dBFS and spurious free dynamic range (SFDR) of 85 dBc with a 70 MHz intermediate frequency (IF), and is also capable of supporting IFs as high as 450 MHz, enabling WiMAX designers to use a single down conversion receiver design instead of the traditional two down conversion stages.

The AD9640 divides the input clock by an integer between 1 and 8, reducing system complexity and improving clock jitter.

The AD9640 is sampling now with production quantities available in April 2007. The ADC is available in 12- and 14-bit resolutions with sample rates of 80, 105, 125 and 150 MSPS. CMOS and LVDS output modes are supported. The 14-bit ADC is priced between $37.50 and $87.50 and the 12-bit ADC is priced between $25.05 and $47.97 in 1,000-piece quantities. Both versions are packaged in 9 mm × 9 mm, 64-lead LFCSP (lead-frame chip-scale package) packages.

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