The HMC976LP3E is a BiCMOS ultra low noise high PSRR Linear Voltage Regulator with the voltage output is ideal for frequency generation subsystems including Hittite"s broad line of PLLs with integrated VCOs. The high power supply rejection ratio in the 0.1 to 10MHz range provides excellent rejection of any preceding switching regulator or other power supply noise. The output voltage can be adjusted lower than the default value by using one external resistor. The output can be set to 5V by grounding the HV pin. The regulator can be powered down by the TTL-compatible enable input.