Instructions for Use

1. Power Supply:

   • Connect the power supply to VCC (Pin 18) and GND (Pin 9).
   • Ensure the power supply voltage is within the specified range (4.5 V to 5.5 V).

2. Reference Voltage:

   • Connect the reference voltage to REF (Pin 16). The reference voltage should be between 0 V and 5 V.

3. Digital Inputs:

   • Connect the 8-bit digital input lines (D0 to D7) to the appropriate control logic.
   • D0 is the least significant bit (LSB), and D7 is the most significant bit (MSB).

4. Control Signals:

   • Chip Select (CS, Pin 17): Active low. When CS is low, the DAC is selected.
   • Write Enable (WR, Pin 15): Active low. When WR is low, data is written to the DAC.
   • Data Latch (DL, Pin 14): Active low. When DL is low, the data is latched into the DAC register.

5. Output Current:

   • The output current (IOUT, Pin 1) will be proportional to the digital input value and the reference voltage.
   • The output current can be calculated using the formula: IOUT = (VREF / 256) * (D7 * 128 + D6 * 64 + D5 * 32 + D4 * 16 + D3 * 8 + D2 * 4 + D1 * 2 + D0)

6. Shutdown Mode:

   • To enter shutdown mode, set the SHDN (Pin 13) pin to high. This reduces the power consumption to 5 μA.

7. Grounding:

   • Ensure proper grounding to minimize noise and improve performance.

8. Decoupling Capacitors:

   • Place a 0.1 μF ceramic capacitor between VCC and GND as close to the IC as possible to filter out high-frequency noise.

9. Layout Considerations:

   • Keep the analog and digital sections of the PCB separate to avoid interference.
   • Use short and wide traces for the reference voltage and output current paths.

10. Testing:

    • After assembly, test the DAC by applying a known digital input and measuring the output current to ensure it matches the expected value.

By following these instructions, you can effectively use the AD7224KN DAC in your application.