We are utilizing multiple AD5398A 120mA, current-sinking 10-bit DACs to programmatically control the current in an array of very-low inductance, very-low-resistance coils. Unfortunately, this part lacks the ability to also source current instead of just sink current. If we could add a polarity-reversing switch at the DACs 'I-sink' output prior to application of current to the coil it should be possible to switching the polarity of the current flowing through the coil. This could be implemented with an ordinary mechanical DPDT switch. Perhaps also with the MAX14689 chip ? For example: the AD5398A's I-sink (current sinking to ground) output could be connected to both NC1 and NO2. NC2 and NO1 could both be attached to ground. Would this work ? Are there constraints that prevent this from being realized ? If not, is there another chip that might achieve this goal?
