14-Bit Analog-to-Digital Converter

February 11, 2011

The 14-bit ADS4149 from Texas Instruments (Dallas, TX) is a high-speed analog-to-digital converter (ADC) that delivers low power consumption and performance across wide signal bandwidths from DC up to 550 MHz. It features a maximum sample rate of 250 mega-samples per second (MSPS) and consumes as little as 275mW per channel at that rate, while offering 72.5-dB SNR at 100-MHz input frequency. Dynamic power scaling reduces power consumption to 215mW at 160 MSPS.

Optional buffered analog input provides constant input impedance across time and frequency and eliminates sample-and-hold kickback, simplifying input matching for passive and active analog front ends, while reducing pass band ripple. A 1- to 6-dB programmable gain option gives customers flexibility to trade off between SNR and spurious free dynamic range (SFDR) with lowered input voltage swing. The ADS4149 family includes pin-compatible 12- and 14-bit options at 160 and 250 MSPS and buffered devices to enable customers to easily move to lower resolutions and samples rates without altering their core design. Migration path from the ADS6149 allows customers to shift to lower power options.

TI’s TSW1200 digital capture tool facilitates rapid analysis of the ADS4149 evaluation module (EVM). Available high-speed mezzanine connector (HSMC) and FPGA mezzanine connector (FMC) allow ADS4149 EVMs to mate to FPGA EVMs for system-level prototyping to speed development time.

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