Fully Integrated, 8 Channel Ultrasound Analog Front End with Passive CW Mixer


The AFE5808A is a highly integrated analog front-end (AFE) solution specifically designed for ultrasound systems in which high performance and small size are required. The AFE5808A 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 AFE5808A is a suitable ultrasound analog front end solution not only for high-end systems, but also for portable ones.

The AFE5808A 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 14bit/65 MSPS ADC in the AFE5808A achieves 77dBFS SNR. It ensures excellent SNR at low chain gain. The ADC’s LVDS outputs enable flexible system integration desired for miniaturized systems.

The AFE5808A 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 AFE5808A 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 AFE5808.


  • 8-Channel Complete Analog Front-End
    • LNA, VCAT, PGA, LPF, ADC, and CW Mixer
  • Programmable Gain Low-Noise Amplifier (LNA)
    • 24/18/12 dB Gain
    • 0.25/0.5/1 VPP Linear Input Range
    • 0.63/0.7/0.9 nV/rtHz Input Referred Noise
    • Programmable Active Termination
  • 40 dB Low Noise Voltage Controlled Attenuator (VCAT)
  • 24/30 dB Programmable Gain Amplifier (PGA)
  • 3rd Order Linear Phase Low-Pass Filter (LPF)
    • 10, 15, 20, 30 MHz
  • 14-bit Analog to Digital Converter (ADC)
    • 77 dBFS SNR at 65 MSPS
    • LVDS Outputs
  • Noise/Power Optimizations (Full Chain)
    • 158 mW/CH at 0.75 nV/rtHz, 65 MSPS
    • 101 mW/CH at 1.1 nV/rtHz, 40 MSPS
    • 80 mW/CH at CW Mode
  • Excellent Device-to-Device Gain Matching
    • ±0.5 dB (Typical) and ±0.9 dB (Max)
  • Low Harmonic Distortion
  • Fast and Consistent Overload Recovery
  • Passive Mixer for Continuous Wave Doppler (CWD)
    • Low Close-in Phase Noise –156 dBc/Hz
      at 1 KHz off 2.5 MHz Carrier
    • Phase Resolution of 1/16λ
    • Support 16X, 8X, 4X and 1X CW Clocks
    • 12dB Suppression on 3rd and 5th Harmonics
    • Flexible Input Clocks
  • Small Package: 15 mm × 9 mm, 135-BGA

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Parametrics Compare all products in Ultrasound

Number of Channels (#)
Operating Temperature Range (C)
Approx. Price (US$)
Resolution (Bits)
Overload Recovery (clock cycle)
AFE5808A AFE5801 AFE5803 AFE5804 AFE5805 AFE5807 AFE5808 AFE5809 AFE5851
Ultrasound Analog Front End     Ultrasound Analog Front End     Ultrasound Analog Front End     Ultrasound Analog Front End     Ultrasound Analog Front End     Ultrasound Analog Front End     Ultrasound Analog Front End     Ultrasound Analog Front End with digital demodulator     Ultrasound Analog Front End    
8     8     8     8     8     8     8     8     16    
0 to 85     -40 to 85     0 to 85     0 to 70     0 to 70     0 to 85     0 to 70     0 to 85     -40 to 85    
135NFBGA     64VQFN     135NFBGA     135NFBGA     135NFBGA     135NFBGA     135NFBGA     135NFBGA     64VQFN    
58.00 | 1ku     40.00 | 1ku     52.00 | 1ku     44.70 | 1ku     44.70 | 1ku     54.00 | 1ku     58.00 | 1ku     87.00 | 1ku     72.00 | 1ku    
12     12
12     12     12
1     1     1     1     1     1     1     1     1    

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