Maxim Integrated provides a recommended PCB layout in the datasheet, but it's also recommended to follow general guidelines for digital potentiometer layouts, such as keeping the signal traces short and away from noise sources, and using a solid ground plane to reduce noise and EMI.
The DS1803Z-050+T&R requires a single 2.7V to 5.5V power supply. Ensure that the power supply is clean and regulated, and that the device is properly decoupled with a 0.1uF ceramic capacitor between VCC and GND.
The DS1803Z-050+T&R has a maximum operating frequency of 400kHz, which is the maximum clock frequency for the I2C interface. However, the device can operate at higher frequencies with proper PCB layout and signal integrity considerations.
When using multiple DS1803Z-050+T&R devices on the same I2C bus, the total bus capacitance should be limited to 400pF to ensure reliable operation. Use I2C bus buffers or repeaters if necessary to extend the bus length or reduce capacitance.
The wiper resistance of the DS1803Z-050+T&R is typically around 70 ohms, but can vary depending on the specific device and operating conditions. This should be taken into account when designing the circuit and calculating the total resistance of the potentiometer.
DS1803Z-050+T&R datasheet
by Maxim Integrated Products
