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dspblok™ a9248 Two Channel High Speed ADC I/O Board

The dspblok a9248 is based on an Analog Devices' AD9248 A/D converter. This 14 bit ADC can sample as high 65M/s. Since both channels are sampled synchronously, the dspstak a9248 is ideal for direct conversion or IF sampling receiver applications.

The dspblok a9248 is powered by Danville's dspblok 21469, dspblok 21369zx or dspblok 21369+fpga DSP Modules.

The dspblok a9248 includes expansion connectors for SPI interfacing, UART, and USB for control and programming.

Maximum performance is achieved with the dspblok 21369+fpga, as shown below.

In this configuration, either the ADSP-21369 DSP or Cyclone III FPGA may acquire and process the input signals. For example, the FPGA might act as a two channel fifo and down sampler. The DSP could then perform additional signal processing using either floating point or high precision fixed point processing.  

If burst measurements or lower sample rates are desired, the dspblok 21469 may be a better choice. It takes advantage of the PDAP (parallel data acquisition port) of the third generation SHARC. The PDAP interface acts as a FIFO so that a block of samples can be acquired and then analyzed by the DSP.

The sampling clock is provided by an external clock or may be supplied by a low phase jitter programmable clock. An external trigger input is also available.

One of two basic input configurations are available. Transformer coupled inputs have lower noise and best isolation. Opamp style inputs (AD8138) are better suited for lower frequency operation and are DC coupled. There are a number of different connector options available. Check the data sheet for details.

SMA connectors are used for all inputs and outputs.

Purchasing Information

Check datasheet for additional connector options.

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