MIKROE DAC 11 Click is a compact add-on board that contains a highly accurate digital-to-analog converter. This board features the DAC128S085, a general-purpose OCTAL 12-bit analog voltage-output DAC from Texas Instruments. It uses both logic voltage levels from the mikroBUS™ socket with a maximum power consumption of 4.85mW at 5V. The on-chip output amplifiers allow rail-to-rail output swing, supporting the SPI serial interface (compatible with standard QSPI, MICROWIRE, and DSP interfaces), which operates at clock rates up to 40MHz. This Click board™ represents an excellent choice for digital gain and offset adjustment applications, programmable voltage and current sources, programmable reference, and many more.
DAC 11 Click is supported by a mikroSDK compliant library, which includes functions that simplify software development.
DAC 11 Click as its foundation uses the DAC128S085, a general-purpose 12-bit 8-channel digital-to-analog converter (DAC) from Texas Instruments. The DAC128S085 is fabricated on a CMOS process with an architecture that consists of switches and resistor strings followed by an output buffer. It ensures monotonicity, low power consumption of 4.85mW at 5V, individual channel power-down capability, and has high precision output amplifier that allows rail-to-rail output swing over a wide supply voltage range.
DAC architecture consists of 4096 equal valued resistors with a switch at each junction of two resistors, plus a switch to ground. The code loaded into the DAC register determines which switch is closed, connecting the right node to the amplifier. Because all eight channels of the DAC128S085 can be controlled independently, each consists of a DAC register and a 12-bit DAC. Depending on the mode of operation, data written into a DAC register causes the 12-bit DAC output to be updated, or an additional command is required to update the DAC output. Also, a Power-On reset circuit ensures that the DAC outputs power up to zero volts and remains there until there is a valid write to the device.
The DAC 11 Click communicates with MCU using the SPI serial interface compatible with standard QSPI, MICROWIRE, and DSP interfaces, with a maximum frequency of 50 MHz. Also, this Click board™ is designed to utilize the entire dynamic range of DAC128S085 by having all power supply pins (and reference voltage pins) connected together, sharing the same supply voltage. In addition, the user is given the option of further use of the RC filter at the output to roll off output noise.
This Click board™ can operate with both 3.3V and 5V logic voltage levels selected via the VCC SEL jumper. This way, it is allowed for both 3.3V and 5V capable MCUs to use the SPI communication lines properly. However, the Click board™ comes equipped with a library containing easy-to-use functions and an example code that can be used, as a reference, for further development.
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