The use of electrical stimulation is being demonstrated effective for the treatment of human motor disorders. The miniaturization of implantable stimulators demands the development of programmable systems in order to control the amount of injected charge for a given therapy. It requires the generation of biphasic pulses with different current amplitudes. The DAC is an important module in this system. DAC linearity is a key aspect, since current amplitudes must be accurately controlled by a digital input code. This work describes the development of a current-steering 8-bit segmented DAC followed by a power output stage for a bipolar stimulator capable to generate current levels from $-255~\\mu$A to $+255~ \\mu$A with resolution of $1\\mu$A in 180 nm process technology. Post-layout results demonstrated a maximum DNL and INL of 0.1685 and 1.71 LSBs, respectively.