Data conversion chipset for fastest wideband signal handling

May 12, 2015 // By Graham Prophet
Texas instruments has introduced a set of three devices; two ADCs and a variable-gain amplifier. The 16-bit 1-Gsample/sec ADC is positioned as the fastest available; there is also a four-channel 14-bit 500-Msample/sec ADC, plus the digital 4.5-GHz DVGA with DC-coupling, delivering highest signal analysis accuracy for wideband equipment

ADS54J60 is the first 16-bit 1-Gample/sec analogue-to-digital converter (ADC) and the first to achieve over 70 dBFS signal-to-noise ratio (SNR) at 1-Gample/sec. TI also announced the highest density four-channel 14-bit 500-Mample/sec ADC, the ADS54J54. To optimise the signal chain, TI’s 4.5-GHz LMH6401 fully differential digital variable gain amplifier (DVGA) offers the widest bandwidth with DC coupling and allows signal acquisition of low and high frequencies without the limitation of baluns used in AC-coupled systems. These ADCs work together with the amplifier to provide the highest performance, lowest power and space savings in defence and aerospace, test and measurement, and communication infrastructure applications.

Features of the ADS54J60 and ADS54J54 ADCs include:

Highest speed in their classes: The 16-bit 1-Gample/sec ADS54J60 ADC and the 14-bit 500-Mample/sec ADS54J54 allow higher frequencies with more accurate signal analysis.

Highest dynamic performance: ADS54J60 offers more than 3 dB better SNR (70 dBFS at FIN=170 MHz) compared to competitive ADCs, a low noise floor of -159 dBFS/Hz, and spurious-free dynamic range (SFDR) of 86 dBc. These enable high spectral purity and the ability to find weak signals in the presence of large, unwanted blockers.

High density: ADS54J54 is 50% smaller than competitive ADCs, offering four channels in a 9 x 9-mm package. ADS54J60 offers two channels in a 10 x 10-mm package.

Reduces the data interface speed and external processor resources: Integrated digital down converter (DDC) offers programmable decimation or a bypass mode.

Simplified board routing and device synchronisation: Both ADCs offer the high-speed JESD204B serial data interface.

Low power: Both new ADCs offer 20% lower power consumption than competitive ADCs.

Features of the LMH6401 DVGA include:

Widest bandwidth with support for DC coupling: 4.5 GHz with programmable gain of -6 dB to 26 dB and DC coupling enables signal acquisition of low and high frequencies. This allows for the full verification and analysis of signals in test and measurement applications.

High linearity: OIP3 of 43 dBm