CAMAC Timed 12-Bit DAC Module

The 3115 is a single-width CAMAC module containing six channels of sampling 12-bit digital-to-analog conversion. Each channel is comprised of a 12-bit D/A converter which is driven by a 1024-word First In, First Out memory.

Once loaded from the Dataway, data is clocked out of the FIFO and into the converter unit where it is transformed to an analog voltage signal. Strap options are provided so that the output range of each channel can be changed in the field to +2.5 volts, +5 volts, +10, 0 to 5 volts, or 0 to +10 volts, independent of other channel settings.

The module uses a two's complement technique to represent the data in the bipolar ranges and complementary straight binary for the unipolar ranges.

CAMAC Timed 12-Bit DAC Module: 3115

3115 Data Sheet

Supporting Chassis

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Clocking FIFO outputs is common for all channels on the module and is accomplished at a rate determined by the clock control register. The eight clock rates, selected from an on-board, crystal-controlled source, are 10, 5, 2.5, and 1 kilohertz, and 500, 250, 100, and 50 hertz. An external clock input and a clock output connection are also provided, so that one 3115 can act as the master clock source for other modules. The maximum external clock frequency is 200 kilohertz; the maximum length of the data stream is 1024 points.

Circuitry is provided so that any channel can generate a LAM request signal once it reaches the half-full point. This signal can interrupt the controlling computer to load additional waveform data.

The 3115's recycle feature permits retransmission of FIFO data once all data has been read out. This allows the module to generate repetitive waveforms. Common to all channels, this feature must be separately enabled from the Dataway and is disabled if any channel is rewritten with new data. While enabling this feature is common to all channels, the recycling in any channel is controlled by end-of-data for that channel. This allows different waveform periods for the various channels.

All analog outputs are available on the 3115's front panel via singlecontact LEMO connectors; so are TTL level clock input and output connections. Front-panel LEDs show when the module is addressed, whether or not it is in the sample state, and indicate the presence of a LAM condition.

CAMAC Module Features

  • 6 Analog Output Channels
  • 12-Bit Resolution DAC
  • 1024 by 12 FIFO Driving each Channel
  • 2K & 4K FIFO Options
  • Selectable Sampling Clock Frequencies
  • External Clock Option
  • Programmable Recycle Feature
  • LAM Request Generation when FIFO Less than Half-Full
  • Selectable Voltage Ranges

CAMAC Module Ordering Information

3115 Products and Part Numbers
6 Channels, 12-bit DAC, 1K x 12 FIFO,
6 1-Contact LEMO Connectors
6 Channels, 12-bit DAC, 2K x 12 FIFO,
6 1-Contact LEMO Connectors
6 Channels, 12-bit DAC, 4K x 12 FIFO,
6 1-Contact LEMO Connectors