TI's new 12-bit ADC samples at 4 GSPS - Embedded.com

TI’s new 12-bit ADC samples at 4 GSPS

Texas Instruments has introduced the ADC12J4000, a 12-bit analog-to-digital converter (ADC) that does RF-sampling at 4 GSPS. The new ADC supports the JEDEC JESD204B serial interface standard for data converters up to 8 Gbps, which the company claims is 50 percent less power than competitive devices. Measuring 10-mm by 10-mm, it is also the smallest IC in its class. The ADC12J4000 can be used in test and measurement, wireless, and defense applications, such as spectrum analyzers, munitions, digital pre-distortion feedback and radar.

The ADC12J4000 combines TI's existing giga-sample ADC intellectual property (IP) with low-power digital processing blocks that provide digital filtering and down conversion. This enables system designers to sample a large block of frequency spectrum at RF and down convert it to quadrature in the digital domain, which can reduce signal distortion. And because the ADC12J4000 utilizes the JESD204B serial interface standard, it can output data on 1 to 8 lanes, depending on the decimation and link rate settings, while simplifying layout.

Key benefits

  • Provides RF sampling capabilities with more than 3-GHz input bandwidth.
  • Consumes only 1.9 W of power, 50 percent less than competitive devices.
  • Can perform some of the external signal conditioning typically handled by the FPGA at a total decimation at 4/8/10/16/20/32x. This provides attenuation of approximately 80-dB at 80 percent bandwidth, 44 dB at 85 percent and 24 dB at 90 percent, enabling system designers to filter higher frequency signals to lower data rates for their applications.
  • Provides a low-noise power ratio of 48.5 dB and noise floor of -149 dBFS/Hz, along with high linearity for signals up to and beyond intermediate frequencies of 3 GHz. These features enable system designs to sample at higher frequencies.
  • The pin-compatible, 4-GSPS, ultra-wideband, RF-sampling LM15851 analog front end (AFE) is export license free.

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