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Synchronous Digital Input Option | Spectrum

This option acquires additional synchronous digital channels phasestable with the analog data. When this option is installed there are is a number of additional digital inputs available for every analog A/D channel. The digital data is stored in the upper bits of the data word. Using this option allows to acquire mixed mode data of analog and digital channels.

12 and 14 Bit A/D converter cards

Block DiagramThe 12 and 14 bit A/D converter products of M2i.30xx, M2i.31xx and M2i.40xx series add the digital input channels in the unused upper bits of the 16 bit data word. A 12 bit card therefore can have 4 additional digital input channels per A/D channel and a 14 bit card can have 2 additional digital input channels per A/D channel. If digital input option is deactivated or not installed the upper bits of the data word contain a sign extension to directly use the data words as 16 bit integer values. If digital input channels are activated one has to split the data in software into analog and digital channels.

16 Bit A/D converter cards

This option acquires additional synchronous digital channels phase-stable with the analog data. When the option is installed there are 16 additional digital inputs on 4 channel A/D instruments and 32 digital inputs on A/D instruments with 8 and more channels.

The digital inputs can be mulitplexed into the analog data by software command using many different formats:

  • Each 16 digital inputs can replace one analog channel.
  • Each 2 digital inputs can be multiplexed into an analog channel with a resolution reduced to 14 bit.
  • Each 4 digital inputs can be multiplexed into an analog channel with a resolution reduced to 12 bit.

Digital acquisition channels on extra bracket

M2i Board with Digital LinesThe digital input channels are located on an extra bracket with a one or two (see picture) universial FX2 connectors. Depending on the number of analog channels a different number of synchrnous digital inputs is available:

  • 1 channel 12 Bit ADC (M2i.30xx): 4 digital channels
  • 2 channels 12 Bit ADC (M2i.30xx): 8 digital channels
  • 2 channels 12 Bit ADC (M2i.31xx): 8 digital channels
  • 4 channels 12 Bit ADC (M2i.30xx): 16 digital channels
  • 4 channels 12 Bit ADC (M2i.31xx): 16 digital channels
  • 8 channels 12 Bit ADC (M2i.31xx): 32 digital channels
  • 1 channel 14 Bit ADC (M2i.40xx): 2 digital channels
  • 2 channel 14 Bit ADC (M2i.40xx): 4 digital channels
  • 4 channel 14 Bit ADC (M2i.40xx): 8 digital channels
  • 2 channels 16 bit ADC (M2i.49xx): up to 16 digital channels
  • 4 channels 16 bit ADC (M2i.49xx): up to 16 digital channels
  • 8 channels 16 bit ADC (M2i.49xx): up to 32 digital channels

The option needs an adjacent empty slot or at least an empty slot break-out for the connector bracket. Adapter cables for FX2 to IDC are included.