Texas Instruments provides a layout guide in the datasheet, but it's essential to follow good analog design practices, such as separating analog and digital grounds, using a solid ground plane, and minimizing trace lengths and loops. Additionally, consider using a 4-layer PCB with a dedicated analog layer to reduce noise and crosstalk.
The internal reference voltage can be configured using the REFSEL pin. For a 2.5V reference, connect REFSEL to VCC, and for a 1.25V reference, connect it to GND. The buffer amplifier can be enabled or disabled using the BUFEN pin. When enabled, the buffer amplifier provides a low-impedance output, but it also increases power consumption.
The maximum output current of the DAC8822QCDBTG4 is 25mA. The output voltage range is dependent on the load resistance and the output current. For a given load resistance, the output voltage range will decrease as the output current approaches the maximum rating.
To ensure monotonicity and linearity, it's essential to follow the recommended operating conditions, such as maintaining a stable power supply, using a low-noise reference voltage, and minimizing digital noise coupling. Additionally, consider using a high-quality external reference voltage and a low-pass filter to reduce noise and improve linearity.
The settling time of the DAC8822QCDBTG4 is typically around 10μs. The settling time affects the output voltage accuracy, as the output voltage may not reach its final value within the specified settling time. To ensure accurate output voltage, it's essential to wait for the settling time to expire before taking a measurement or using the output voltage in a critical application.
DAC8822QCDBTG4 datasheet
by Texas Instruments
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