- 16 independent SoftSpan DACs
- Independently programmable output ranges: 0 V to 5 V, 0 V to 10 V, ±5 V, ±10 V, ±15 V
- Full 16-bit resolution at all ranges
- Flexible single- or dual-supply operation
- Maximum INL error: ±3 LSB
- Precision 4.096 V reference, ±5 ppm/°C maximum
- A/B toggle or sinusoidal dither using up to 3 toggle pins
- Multiplexer for output voltage and load current sense
- Outputs drive ±20 mA guaranteed
- 6 mm × 6 mm, 40-lead LFCSP
The LTC2688 is a 16-channel,16-bit, ±15 V digital-to-analog converter (DAC) with an integrated precision reference. The LTC2688 is guaranteed monotonic and has built in rail-to-rail output buffers that can source or sink up to 20 mA. This SoftSpan™ DAC offers five output ranges up to ±15 V. The range of each channel is independently programmable.
The internal 4.096 V precision reference sets the accuracy of the output voltage. An external reference can be used for additional range options. Three toggle pins support Input Register A and Input Register B toggle or sinusoidal dither at multiple frequencies. An analog multiplexer simplifies measurement of pin voltages, load currents, and junction temperature.
Programmable offset and gain registers improve the accuracy of the DAC outputs.
The serial peripheral interface (SPI) and MICROWIRE™-compatible, 3-wire serial interface operates on logic levels as low as 1.71 V and clock rates up to 50 MHz.
- Optical networking
- Data acquisition
- Automatic test equipment
- Process control and industrial automation
The DC2873A-B is a fully featured evaluation board that is used to evaluate the LTC2688, a 16-channel, precision voltage output digital-to-analog converter (DAC).
The DC2873A-B is controlled through a serial peripheral interface (SPI) from the J1 connector. The SPI signals are sent from the DC2026C controller board through the ribbon cable that is connected to the DC2873A-B.
The DC2873A-B uses Analysis, Control, Evaluation (ACE) software to provide an intuitive graphical user interface (GUI) that configures and controls the LTC2688 using the SPI interface.
The LTC2688 is used for various voltage mode biasing applications such as optical modulators for data communications. The output voltage range for each channel is software selectable, and any channel can be routed to the DC2873A-B MUX pin, allowing either the channel voltage or current to be externally monitored.
For full specifications on the LTC2688, see the LTC2688 data sheet, which must be consulted in conjunction with the user guide when using the DC2873A-B.