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14bit ADC at 250MSPS supports up to 125MHz

Posted: 05 Jun 2013 ?? ?Print Version ?Bookmark and Share

Keywords:base station? ADC?

Texas Instruments Inc. (TI) has uncloaked what it touts as the industry's fastest 4-channel, 14bit ADC, clocking in at 250MSPS. According to the firm, the high-density ADS4449 enables receiver systems to support up to 125MHz of instantaneous bandwidth in extremely small forms such as multiple input and multiple output (MIMO) base stations and munitions guidance, or in greater density applications, such as active electrically scanned array (AESA) and other phased-array radars.

The ADS4449 provides an additional 4dB SNR and 8dB SFDR, compared to existing 4-channel ADCs, the company said. The ADC enables system designers to maintain small form factors and increase dynamic performance and signal bandwidth, while reducing power consumption and cost, continued TI. It also provides 4 channels in a single 10 x 10mm package, 38-per cent smaller than dual-channel ADCs, which enables designers to build receiver systems that can support up to 125MHz of instantaneous bandwidth in extremely small forms.

According to TI, the ADC delivers 69dB signal-to-noise ratio (SNR) and 86dBc spurious-free dynamic range (SFDR) at 250MSPS, enabling 4-channel receivers capable of 3G, 4G and MC-GSM performance for macro and distributed antenna base stations. It also uses only 365mW per channel to reduce power consumption in high-density designs.

The ADS58H40 and ADS58H43 provide 11bit, 250MSPS intermediate frequency (IF) and digital pre-distortion (DPD) feedback, which includes up to 90MHz of SNRBoost (3G+) bandwidth with 70.5dB of in-band SNR.

Additionally, the ADC can be combined with TI's 4-channel LMH6522 digital variable gain amplifier (DVGA), 4-output TRF3765 wideband PLL/VCO and the LMK04800 clock jitter cleaner to create what the firm boasts as the industry's smallest 4-channel IF receiver, providing an additional 31dB of dynamic range and low phase noise in a small footprint.

The ADS4449EVM is available to evaluate the ADS4449 and can be purchased for $599. An IBIS model is also available.

The ADS4449EVM is compatible with the TSW1400EVM data capture card and TSW1405EVM for pattern capture. For quick evaluation, TI also provides the HSDC-SEK-10 high-speed data converter system evaluation kit for a low noise signal, clock and power source.

The ADS4449, ADS58H40 and ADS58H43 are available in a 10 x 10mm BGA package. Pricing is as follows in 1,000-unit quantities: ADS4449 for $199.85; ADS58H40 for $168.95 and ADS58H43 for $139.13.

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