Part Number: ISO7741
For the ISO7741, should an unused input be tied high or low to inhibit the frequency carrier for that channel? (In the datasheet, figure 19 implies that a high level turns on the carrier; Fig 20 shows that the low level turns on the carrier.)
Hi Les,
Welcome to E2E! A device's default output state determines how unused inputs should be connected to prevent transmission of the carrier frequency in the channel.
For devices that have an "-F" suffix, like ISO7741F, the unused inputs should be connected to GND, and for devices that do not have an "-F" suffix, like ISO7741, unused inputs should be connected to Vcc. This is a common question; for additional responses please feel free to review the thread below:
Thank you,
Manuel Chavez
