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The design of full integrated electronics readout for the future ILC ECAL presents many challenges. Low power dissipation is required, and it will be necessary to integrate the very front-end stages with an analog to digital converter. We present here a 12 bit 25 MHz analog to digital converter using a pipelined architecture. It is composed of ten 1.5 bit sub-ADCs along with a final 2 bit flash converter. A CMOS 0.35 μm process is used. The dynamic range is 2 V over a 3.3 V power supply and the total power dissipation is 37 mW. The analog part of the converter can be switched to a standby mode in only a couple of μs. This power management helps to reduce the DC power dissipation by three orders of magnitude. Therefore by switching the DC bias following the beam cycle time (1% of duty cycle), an average power consumption of only 0.2 μW is measured. The converter prototype occupies an active die area of 1.7 mm *0.6 mm.