An ultrasound probe (106) contains an array transducer (101) and a microbeamformer coupled to elements of the array. The microbeamformer comprises analog ASICs (102) with transmitters and amplifiers coupled to elements of the array (101). The microbeamformer also comprises analog to digital converters which convert received echo signals to digital data, and digital beamforming circuitry located in digital ASICs (103). The digital ASICs (103) are clocked at a lower core frequency than that of which the digital integrated circuit process of the digital ASICs (103) is capable, and the digital ASICs (103) are operated at a lower supply voltage than that for which the digital integrated circuit process is designed, both of which reduce power consumption by the microbeamformer.