The AFE5808 is a highly integrated analog front-end (AFE) solution specifically designed
for ultrasound systems in which high performance and small size are required. The AFE5808
integrates a complete time-gain-control (TGC) imaging path and a continuous wave Doppler (CWD)
path. It also enables users to select one of various power/noise combinations to optimize system
performance. Therefore, the AFE5808 is a suitable ultrasound analog front end solution not only for
high-end systems, but also for portable ones.
The AFE5808 contains eight channels of voltage controlled amplifier (VCA), 14/12-bit
Analog-to-Digital Converter (ADC), and CW mixer. The VCA includes Low noise Amplifier(LNA), Voltage
controlled Attenuator(VCAT), Programmable Gain Amplifier(PGA), and Low-Pass Filter (LPF). The LNA
gain is programmable to support 250 mVPP to 1 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 dB and 30 dB.
Before the ADC, a LPF can be configured as 10, 15, 20, or 30 MHz to support ultrasound applications
with different frequencies. The high-performance 14 bit/65 MSPS ADC in the AFE5808 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 AFE5808 also 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 3rd and 5th
order harmonic suppression filter is implemented to enhance CW sensitivity.
The AFE5808 is available in a 15-mm × 9-mm, 135-pin BGA package and it is specified for
operation from 0°C to 85°C. It is also pin-to-pin compatible to the AFE5807, AFE5803, and
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