Our new Digital ADC technology can be implemented in a digital only silicon technology without using any of the analog IP blocks traditionally used for ADC designs. This reduces the design cycle time and cost of integrating ADCs in to ASICs, and can be implemented in fully digital microchips such as FPGAs avoiding the use of external costly ADCs and saving board space.
Configurations are available that support up to 14 bits of resolution at 10 kHz bandwidth, 12 bits up to 40 kHz bandwidth, and 10 bits up to 100 kHz bandwidth. Development is continuing to support higher bandwidths.
Block Diagram of the Digital ADC
The analog input is optionally AC-coupled to adjust the DC bias, and then enters the FPGA or ASIC on the non-inverting input of an LVDS input buffer, where it is compared to the reconstructed feedback signal on the inverting input. The difference signal is processed by the digital logic to generate the feedback signal and the ADC output samples that can be used by the rest of the FPGA or ASIC.
The only other signal required by the Digital ADC is a clock input. The frequency of the clock and the characteristics of the tracking loop affect the bandwidth and signal-to-noise ratio of the Digital ADC.
Audio Evaluation Board
The FPGA based audio evaluation board can be configured to demonstrate each of the following versions of the Digital ADC in audio applications:
- ADC 0 - 24.578 MHz clock, 11 bit resolution, 5 kHz bandwidth
- ADC 1 - 24.578 MHz clock, 10 bit resolution, 20 kHz bandwidth
- Analog output through an RCA jack
- SPDIF output through an RCA jack
- I2S output through a 4 pin header
- Parallel data output through a 18 pin header
For ordering information please see the Sales page.
Please see the Digital ADC Factsheet
Digital Sigma-Delta DAC Family
Stellamar offers a family of Sigma-Delta DACs. These digital DACs can be implemented in digital only silicon technologies such as FPGAs or Digital ASICs.
Within this family, a DAC can be quickly built and customized for your application.
- Up to 16 bit resolution
- Up to 100 kHz bandwidth
Digital Controllers for Switch-Mode DC-DC Converters
Stellamar offers fully digital synthesizable controllers that can be easily embedded in digital ASICs or FPGAs. No traditional ADC is required to digitize the output voltage for the feedback loop. Controllers are available for buck (step down), boost (step up) and inverting buck-boost converters.
Block Diagram of the Buck DC-DC Converter
Block Diagram of the Boost DC-DC Converter
Please see the Digital Controllers for DC-DC Converters Application Note