This signaling system enables the transmission of digital signals and power over the same two wires (Figure 1). The signal waveform is recTIfied at the remote locaTIon to provide a stable supply voltage and modest load current (about 1mA maximum) for the receiver.
Figure 1. This digital signaling system accepts single-ended data, transmits differential data, and produces a supply voltage for the receiver by full-wave rectifying the remote-end signal.
For conventional single-ended data, a series of "0s" can allow excessive droop in the receiver's supply voltage. To avoid that problem differential data (± 5V to ± 18V) is transmitted, pseudo RS-485 style, from a single-ended logic-level input. The full-wave rectifier and differential drive ensures that a supply voltage is always present
Current-limiting resistors at the supply inputs prevent damage in the event of a line short. Values ​​of 1kΩ are optimum. Higher values ​​produce excessive switching noise at the chip side of the resistors, caused by charge injection from the switches. Adequate decoupling of the supply rails also helps to minimize noise.
With + 5V and -5V supplies powering the MAX4526 / 4527 as shown in Figure 1, the measured output for various loads is as follows:
| Load (Ω) | VSUPPLY (V) |
| 1M | 9.60 |
| 47k | 9.00 |
| 10k | 8.60 |
| 8.2k | 8.40 |
| 5k | 8.20 |
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