RB8510 12-bit DAC
[Reference Manual]

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Detailed Description

Purpose

Generate a unipolar or bipolar voltage.

Description

Module RB8510 is a dual 12-bit Digital to Analog Converter. It contains two 12-bit Digital to Analog Converters (DACs), each connecting to a BNC connector on the front panel. There are no inputs.

The module's front-panel looks as follows.

  +-----------+
  | CONVERTER |
  |   12-bit  |
  |           |
  |    dac1   |
  |     (o)   |
  |           |
  |           |
  |           |
  |           |
  |    dac0   |
  |     (o)   |
  |           |
  |           |
  |           |
  |    RULBUS |
  +-----------+

Configuration

At production time, each DAC is configured for unipolar or bipolar operation and its output voltage range is defined as 5, 10 or 20V.

The following table shows the volt-per-bit values for the various output voltage ranges.

   Voltage range      |  volt-per-bit   bipolar
----------------------+--------------------------
   0    ..  5.11875 V |    1.25 mV        0
   0    .. 10.2375  V |    2.5  mV        0
   0    .. 20.475   V |    5    mV        0
  -5.12 ..  5.1175  V |    2.5  mV        1
 -10.24 .. 10.235   V |    5    mV        1

Default configuration

rb8510_dac12 "name"
{
   address = 0xD0
   bipolar = true
   volt_per_bit = 5e-3
}

When the Rulbus configuration file is read, DAC-outputs are set to 0 Volt.

Usage

There are functions to set and get the output voltage and functions to set and get the DAC-register code.

int32 handle;

rb8510_dac12_open( &handle, "dac-ch0" );
rb8510_dac12_setVoltage( 1.23 );
rb8510_dac12_close( handle );

For each channel of the DAC module, a separate object must be created.

See dac.cpp for a complete example.

Open and close
EXPORT int32 RDL_API	rb8510_dac12_open (int32 *pHandle, CCstr name)
	open a DAC.
EXPORT int32 RDL_API	rb8510_dac12_close (int32 handle)
	close a DAC.
Voltage output
EXPORT int32 RDL_API	rb8510_dac12_getVoltage (int32 handle, float32 *pVoltage)
	get current DAC voltage.
EXPORT int32 RDL_API	rb8510_dac12_setVoltage (int32 handle, float32 voltage)
	set DAC to new voltage.
Value output
EXPORT int32 RDL_API	rb8510_dac12_getValue (int32 handle, int32 *pValue)
	get current DAC register value.
EXPORT int32 RDL_API	rb8510_dac12_setValue (int32 handle, int32 value)
	set DAC register to new value.
Configuration
EXPORT int32 RDL_API	rb8510_dac12_isBipolar (int32 handle, int32 *pFlag)
	true if DAC has bipolar configuration.
EXPORT int32 RDL_API	rb8510_dac12_getVoltperbit (int32 handle, float32 *pVpb)
	set DAC register to new code.

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