PCIe digitizers acquire analog and digital signals simultaneously

Article By : Susan Nordyk

An option for all models of Spectrum’s M4i-44xx series of 14/16-bit PCIe digitizer cards furnishes eight additional digital input lines.

An option for all models of Spectrum Instrumentation’s M4i-44xx series of 14/16-bit PCIe digitizer cards furnishes eight additional digital input lines. Sitting beside the digitizer, the M41.44xx-DigSMA digital input module shares a common clock and trigger with the base card so that both the digital and analog inputs are fully synchronous. This makes the combination useful for a wide variety of mixed-signal testing applications.

Spectrum Instrumentation PR photo of PCIe digitizer cards with digital inputs

Comprising eight different models, the M4i-44xx series offers a choice of two or four analog channels and sampling rates of 180 Msamples/s or 250 Msamples/s with 16-bit resolution or higher speed of 400 Msamples/s or 500 Msamples/s with 14-bit resolution. Digitizers also provide three digital inputs, analog signal conditioning, and triggering, as well as 2 Gsamples of onboard memory. Alternatively, acquired data can be transferred to a PC.

The M41.44xx-DigSMA option has a separate PCIe faceplate and occupies an additional PCIe slot. Each of its eight inputs provides an impedance of 10 kΩ (to 3.3. V). This allows the inputs to handle 3.3-V LVTTL signals with input voltage levels between -0.5 V and +4.0 V. The digital input bandwidth is 125 MHz and software selection enables both synchronous and asynchronous acquisition modes.

For applications that require more channels, up to eight digitizers can be linked together using the Star-Hub clock and trigger distribution system.

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