Electronic Design

14-Bit ADC Provides 250-Msample/s Speeds

The 14-bit ADS62P49 analog-to-digital converter (ADC) from Texas Instruments operates at 250 Msamples/s with a 73-dBFS signal-to-noise ratio (SNR) and 85-dBc spurious-free dynamic range (SFDR) at an input frequency of 60 MHz. According to TI, that’s the industry’s fastest sample rate, with increased signal bandwidth without compromising range and sensitivity in communications and defense imaging systems or accuracy in wide-band test and measurement equipment.

The ADC’s 625 mW per channel reduces the thermal footprint for increased system efficiency in high-density, multi-antenna basestation receivers and software-defined radios, TI says. The company also says its programmable gain and other user-selectable settings maximize design flexibility. Internal gain up to 6 dB in 1-dB steps allows customers to optimize SNR, SFDR, and input swing based on the unique need of their applications. Designers can maximize SNR to enhance linearization effectiveness in digital pre-distortion (DPD) solutions, while SFDR can be increased an input drive reduced to improve small-signal analysis in defense and radio receiver applications.

The ADS62P49 is the first in a series of four 12- and 14-bit dual-channel ADCs with 210- and 250-Msample/s rates. The ADS62P49, ADS62P28, ADS62P29, and ADS62P48 are pin-compatible with the dual-channel ADS6000 family for easy upgrades in speed and resolution. Also, the ADS62P49EVM has on-board sockets for a voltage-controlled crystal oscillator, crystal filter, and TI’s CDCE72010 clock distribution and jitter cleaning chip, which allows the EVM to function as a system-level evaluation kit and an ADC evaluation board.

Available now, the ADS62P49 comes in a 9- by 9-mm quad flat no-lead package and costs $144.75 in 1000-unit quantities.

Texas Instruments


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