The function and pin definition of multi-channel 16-bit D/A converter LTC2704-16 are introduced and the method how to use LTC2704-16 is given.The four-channel D/A convertor of LTC2704-16 is independent and each DAC has a feedback separately.LTC2704-16 with readback is very simple and communicates with controller by serial interface,it can be used in many kinds of data acquisition system.