Model D/A-02A can be installed in short I/O slots of PC/XT/AT class computers. The card consists of two separate double-buffered 12-bit, multiplying digital-to-analog converters (DAC) plus interface circuits. Since data are 12 bits long, data are written to each DAC in two consecutive bytes. The first byte is the least significant and contains the eight least significant bits. The second byte is the most significant and contains four zeros and the four most significant bits. The least significant byte is written first and the most significant last. Both bytes are stored in an intermediate register in the DAC.

Analog-Output update mode is selected by jumpers and three update modes are available:

• Individual update of each channel when the high byte (most significant) is written.
• Simultaneous update of both channels on program "read" from any location assigned.
• Simultaneous update of both channels on a low transition of an external pulse.

Data are written to the DAC's in right-justified binary format. For example:

Unipolar Ranges: 0000 0000 0000 = zero

1000 0000 0000 = half scale

1111 1111 1111 = full scale

Bipolar Ranges: 0000 0000 0000 = minus full scale

1000 0000 0000 = zero

1111 1111 1111 = plus full scale

Specifications

Analog Outputs

• Resolution: 12 bits (0 to 4095 decimal)
• Channels: Two, Independent
• Voltage Output Ranges at 5mA max.:
  0.0 to 5.0 VDC, 0.0 to 10.0 VDC, -5.0 to 5.0 VDC
• Current Output Ranges with excitation voltage (8 - 36) VDC:
  0.0 to 5.0 mA, 1 to 5 mA, 0 to 20 mA, 4 to 20 mA, (0 to 50 mA, 10 to 50 mA)*
  *: Addition of one 167 ohm resistor per channel is required.

Digital to Analog Converter

• AD-7548 monolithic chip, double buffered, right justified.
• Relative Accuracy: 1 LSB (includes nonlinearity)
• Monotonicity: Guaranteed over operating temperature range
• Settling time: 4 usec to 0.01% for full scale step input
• Offset Temperature Drift:
  1 ppm/C typ., 3 ppm/C max.
• Gain Temperature Drift:
  1 ppm/C typ., 5 ppm/C max.
• Data Format: Right-justified, two bytes (8LSB's and 4MSB's)

Environmental

• Operating Temperature: 0 to 60 degree C.
• Storage Temperature: -20 to 85 degree C.
• Humidity: 5% to 95% non condensing.
• Weight: 4 Oz.
• Size: 4.0 inches. Install in a half-size slot.

Power Requirements

• 5 VDC at 150 mA max.
• 12 VDC at 25 mA max.
• -12 VDC at 20 mA max.

Regulatory Compliance

• This product is in full compliance with CE requirements.

Part Number	Price(USD)
D/A-02A	Discontinued

View / Download Manual (in .pdf format)