by

|   March 31, 2009 at 7:25 PM

This DAC works very nicely and gives me great resolution, i.e. 4095 steps from 0 - 5 volts.

But I can only use one DAC, since the breakout board's design ties the "External A0 Address Pin" to Vss.
Personally I would like to use two MCP4725 - one with address 0 (A0 = Vss) and one with address 1 (A0 = Vdd).

Still a very nice board. Thanks for making it available.

Cheers,
Stephan Schulz.

by

|   April 21, 2009 at 9:38 AM

I agree that the address should be configurable on this board. Just some pads that could be bridged with a dab of solder would be fine. Next rev?

--Adam

by

|   May 22, 2009 at 10:59 AM

Maybe some jumpers or break-out the address pins?

by

|   August  6, 2009 at 8:38 AM

Just a couple comments. The pin numbering on the schematic in the link above is incorrect. (e.g., A0 should be pin 6.)

I also agree the address pin should be brought out in the Breakout Board. Per the datasheet, the Device Address Selection pin can be tied to VSS or VDD, or can be actively driven by the digital logic levels. The logic state of this pin determines what the A0
bit of the I2C address bits should be.

Alternately, SparkFun could offer four different versions of the Breakout Board (by just changing which MCP4725 is soldered to it) or offer just the PCB with the two resistors and the cap pre-soldered and offering the DAC separately.

Part Number Address Option Code
MCP4725A0T-E/CH A0 (00) AJNN
MCP4725A1T-E/CH A1 (01) APNN
MCP4725A2T-E/CH A2 (10) AQNN
MCP4725A3T-E/CH A3 (11) ARNN

OR, it's easy enough to simply swap the 6-pin SOT-23 DAC chip.

Anyway, thank you again SparkFun for an awesome Breakout Board.