The AFE5812 is a highly-integrated analog front-end (AFE) solution specifically designed for ultrasound systems in which high performance and small size are required. The AFE5812 integrates a complete time-gain-control (TGC) imaging path and a CWD path. It also enables users to select one of various power/noise combinations to optimize system performance. Therefore, the AFE5812 is a suitable ultrasound AFE solution not only for high-end systems, but also for portable ones.

The AFE5812 contains eight channels of voltage controlled amplifier (VCA), 14-bit and 12-bit ADC, and CW mixer. The VCA includes LNA, VCAT, PGA, and LPF. The LNA gain is programmable to support 250 mVPP to 0.75 VPP input signals. Programmable active termination is also supported by the LNA. The ultra-low noise VCAT provides an attenuation control range of 40 dB and improves overall low-gain SNR, which benefits harmonic imaging and near-field imaging. The PGA provides gain options of 24 and 30 dB. Before the ADC, a LPF can be configured as 10, 15, 20, 30, 35 or 50 MHz to support ultrasound applications with different frequencies. In addition, the signal chain of the AFE5812 can handle signal frequency lower than 100 kHz, which enables the AFE5812 to be used in both sonar and medical applications. The high-performance 14-bit/65-MSPS ADC in the AFE5812 achieves 77 dBFS SNR. It ensures excellent SNR at low chain gain. The ADC’s LVDS outputs enable flexible system integration desired for miniaturized systems.

The AFE5812 integrates a low-power passive mixer and a low-noise summing amplifier to accomplish on-chip CWD beamformer. 16 selectable phase-delays can be applied to each analog input signal. Meanwhile, a unique third- and fifth-order harmonic suppression filter is implemented to enhance CW sensitivity.Read more