ADI's new ADCs combine high SFDR and SNR with low-power operation for wireless infrastructure communications systems.Analog Devices Inc. is introducing a family of 14-bit and 12-bit ADCs (analog-to-digital converters) that offer low-power operation ideal for wireless infrastructure applications. The flagship device, the AD9246 is the first 14-bit, 125-MSPS (million samples per second) ADC to achieve SFDR (spurious-free dynamic range) of 85 dBc at a 70 MHz input. A critical specification for wireless communications, SFDR expands the dynamic range of base station receivers by capturing weak signals in the frequency band of interest, despite the presence of strong, interfering signals. In addition to the highest SFDR in its class, the AD9246 provides SNR (signal-to-noise ratio) of 72.25 dBfs 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. This combination of speed, resolution, IF (intermediate frequency) performance, and power makes the AD9246 ideal for smaller wireless infrastructure systems, such as micro and pico cell base stations.
More about the AD9246
In addition to SFDR performance of 85 dBc at an input frequency of 70 MHz, the AD9246 provides SFDR of 75 dBc and SNR of 70.2 dBfs at an input frequency of 280 MHz. The AD9246's high IF sampling and high sampling rate simplify system design and reduce cost making it ideal for third-generation communications receivers like CDMA2000, UMTS and TD-SCDMA. The AD9246 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 features a high-performance SHA (sample-and-hold amplifier) 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. To maximize system performance, the AD9246 can be used with ADI's AD8139 and AD8351 differential amplifiers, AD6636 digital down-converter and AD951x family of clocking devices.
Pricing and Availability
The 14-bit, 125-/105-MSPS AD9246 and 12-bit, 125-/105-MSPS AD9233 ADCs are sampling now with production quantities available in February 2006. The devices are specified over the extended industrial temperature range of вЂ"40 degrees C to +85 degrees C and are each available in a 7 mm Г— 7 mm LFCSP (lead frame chip scale package). The 125-MSPS AD9246, 105-MSPS AD9246, 125-MSPS AD9233 and 105-MSPS AD9233 are respectively priced at $48.50, $39.95, $26.95 and $22.75 per unit in 1,000-piece quantities.
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