[FAQ] TPL1401: What is the maximum update rate of the output of the TPL1401?

The update rate of the TPL1401 will depend on how fast data can be written to the device. The TPL1401 supports I²C standard mode (100 kbps), fast mode (400 kbps), and fast mode plus (1 Mbps). This TIPL training goes through how to calculate the update rate for a device: DACs: Settling Time and Update Rate

For a single update, the TPL1401 requires a start condition, a valid I²C address byte, a command byte, and two data bytes. After each byte is received, the TPL1401 acknowledges the byte by pulling the SDA line low during the high period of a single clock pulse. This means that there is a total of 36 clock pulses for each update. Using the techniques in the lecture, the update rate for the TPL1401 in each I²C mode is as follows:

Standard: 399.5us or 2.5Kbps

Fast: 96.1us or 10.4Kbps

Fast Plus: 38.58us or 26Kbps

The TPL1401 can be found in many common applications:

You can find some additional information about the TPL1401 here:

You can find more information about precision DACs here: