EPT-4901-DA-S1 Digital To Analog Converter Board

This DAC board features the MCP4091 Eight bit Digital to Analog chip. It is designed to fit into a bread board and connect to any Arduino board. The chip operates from a single 2.7V to 5.5V supply with any SPI compatible Serial Peripheral Interface. So, it can accommodate the +3.3V and +5V Arduinos such as the Mini, Mini Pro, Nano.

This board is fully assembled and ready for use

The EPT-4901-DA-S1 is ready to be plugged into a bread board and connected to any MCU that supports the SPI bus. It can be powered by either +3.3V or +5V. This board has an example sketch in the Arduino IDE that shows the user how to send a digital value to the board and produce a voltage output.

Hardware Features:

• Uses the SPI interface accessible by Arduino Libraries
• 8-bit, Rail to Rail, Voltage Output DAC
• Fast Settling Time of 4.5 µs
• Compatible with +3.3V or +5V interface
• 8Mb Flash chip utilized in +5V mode only
• Convenient Bread Board Connectors SMT mounted on bottom
• Green LED Power Indicator

Variable Analog Output

The EPT-4901-DA-S1 contains a MCP4091 DAC chip. The board can be used to generate any analog voltage from ground to VREF. VREF is determined by a voltage divider using a potentiometer. The potentiometer allows VREF to vary from zero volts to VCC. VCC is determined by the voltage used to power the EPT-4901-DA-S1. The DAC will accept any input digital value from zero to 255 and convert this value to analog. However, VREF determines the step size of each digital value.

Digital to Analog Converter

The MCP4901 is a single channel 8-bit buffered voltage output Digital-to-Analog Converter (DAC). The devices operate from a single 2.7V to 5.5V supply with an SPI compatible Serial Peripheral Interface. The user can configure the full-scale range of the device to be VREF or 2*VREF by setting the gain selection option bit (gain of 1 of 2). The device be can shut down by setting the Configuration Register bit. In Shutdown mode, most of the internal circuits are turned off for power savings, and the output amplifier is configured to present a known high resistance output load (500 kΩ typical).

The device include double-buffered registers, allowing synchronous updates of the DAC output using the LDAC pin. These devices also incorporate a Power-on Reset (POR) circuit to ensure reliable powerup. The device utilizes a resistive string architecture, with its inherent advantages of low Differential Non-Linearity (DNL) error and fast settling time. This device is specified over the extended temperature range (+125°C).