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ADC combines high SFDR, low power consumption

Posted: 05 Sep 2006 ?? ?Print Version ?Bookmark and Share

Keywords:Analog Devices? ADI? AD9254? ADC?

Analog Devices Inc. (ADI) is expanding its portfolio of devices targeted at wireless infrastructure applications with the AD9254 14bit, 150MSps ADC. The device achieves 83dBc spurious-free dynamic range (SFDR) at 70MHz while consuming 430mW, a 50 percent reduction in power consumption over competing solutions according to the company. ADI said this combination of high SFDR, low power consumption and small packaging makes the device well suited for a range of wireless infrastructure applications, including WiMAX and pico cell base station receivers, as well as ultrasound and handheld instrumentation equipment.

Low power consumption
According to the company, the low power consumption of the new ADC simplifies the deployment of cellular receivers and saves design and electricity costs by eliminating the need for separate cooling devices. Furthermore, the 150MSps sample rate eases analog filtering in the receiver path and enables a wider continuous bandwidth up to 75MHz, ADI said, which is necessary to support the 20MHz bandwidth requirements of a WiMAX base station receiver. The high sample rate also allows designers to realize the benefits of the lower noise floor and simplified AGC loop, the company explained.

'Best' SFDR, SNR
The new ADC achieves SFDR of 83dBc with a 70MHz input. High SFDR expands the dynamic range of base station receivers by capturing weak signals in the frequency band despite the presence of stronger signals. In addition to high SFDR, ADI said the new device provides SNR of 72.7dBFS at 70MHz input. This enables high-quality conversion of third-generation wireless standards including CDMA2000, W-CDMA and TD-SCDMA, reducing power consumption by adhering to the lower voltage levels of each standard, the company explained. The ADC's sample-and-hold amplifier (SHA) maintains efficient performance for input frequencies up to 200MHz. The device is pin-compatible with the AD9246 and AD9233 ADCs and can be used with ADI's AD8352 driver IC.

The AD9254 is already sampling. It is priced at $55 per unit in 1,000-piece quantities and is packaged in a 7-by-7mm 48-lead LFCSP. The device is specified over the industrial temperature range (-40C to 85C).

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