two MCP4725 Breakout Boards

I have two MCP4725 Breakout Boards - 12-Bit DAC w/I2C Interface.

how can I connect these two boards with arduino uno?

I need to produce two output.

Have you tried these?
"We have an easy-to-use Arduino library and tutorial with a triangle-wave and sine-wave output example that can be used with any 'duino or ported to any microcontroller with I2C host. Wiring it up is easy - connect VDD to your microcontroller power pin (3-5V), GND to ground, SDA to I2C Data (on the Arduino Uno, this is A4 on the Mega it is 20 and on the Leonardo digital 2), SCL to I2C Clock(on the Arduino Uno, this is A5 on the Mega it is 21 and on the Leonardo digital 3) and listen on VOUT."

I have an Arduino UNO and two MCP4725 Breakout Boards.
I need to have two different outputs at the same time.

cchechio:
I have an Arduino UNO and two MCP4725 Breakout Boards.
I need to have two different outputs at the same time.

Did you take the time to read the adafruit articles linked by Crossroads?

From the adafruit pages:-

We break out the ADDR pin so you can connect two of these DACs on one I2C bus, just tie the ADDR pin of one high to keep it from conflicting.

Next up, download the Adafruit MCP4725 library. This library does all of the interfacing, so you can just "set and forget" the DAC output.

So you write to one and it outputs the required voltage coninuously.
Then you write to the other and it does the same.
Sounds fairly straightforward to me.

Can someone elaborate on what is meant by the following?

"tie the ADDR pin of one high"

Does this mean that I should bridge A0 and VDD for the second MCP4725 board? Fairly new to electronics so I don't know the lingo yet.

ShaunLandau:
Can someone elaborate on what is meant by the following?

"tie the ADDR pin of one high"

Does this mean that I should bridge A0 and VDD for the second MCP4725 board? Fairly new to electronics so I don't know the lingo yet.

Yes. One will be at address 0x62 and the other at address 0x63.