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Texas Instruments AFE5818 Ultrasound Analog Front End (AFE)

Texas Instruments AFE5818 Ultrasound Analog Front End (AFE) is a highly-integrated, analog front-end solution specifically designed for ultrasound systems requiring high performance and small size. The device integrates a complete time-gain-control (TGC) imaging path and a continuous wave Doppler (CWD) path. The device also allows various power and noise combinations to be selected to optimize system performance. The AFE5818 has a total of 16 channels. Each channel consists of a voltage-controlled amplifier (VCA), a simultaneous sampling 14-bit and 12-bit analog-to-digital converter (ADC), and a continuous wave (CW) mixer. Therefore, the Texas Instruments AFE5818 is a suitable ultrasound AFE solution for both high-end and portable systems.

Features

  • 16-channel, complete analog front-end
    • LNA, VCAT, PGA, LPF, ADC, and CW mixer
  • LNA with programmable gain
    • Gain 24dB, 18dB, and 12dB
    • Linear input range (0.25VPP, 0.5VPP, and 1VPP)
    • Input-referred noise (0.63nV/√Hz, 0.7nV/√Hz, and 0.9nV/√Hz)
    • Programmable active termination
  • 40dB Voltage-Controlled Attenuator (VCAT) 
  • 24dB and 30dB Programmable Gain Amplifier (PGA) 
  • 54dB (max) total signal chain gain 
  • 3rd-order, linear-phase LPF
    • 10MHz, 15MHz, 20MHz, 30MHz, 35MHz, and 50MHz
  • Analog-to-Digital Converter (ADC)
    • 14-Bit ADC: 75dBFS SNR at 65MSPS
    • 12-Bit ADC: 72dBFS SNR at 80MSPS
  • LVDS interface maximum speed of 1Gbps
  • Noise and power optimizations (full-channel)
    • 140mW/ch at 0.75nV/√Hz, 65MSPS
    • 91.5mW/ch at 1.1nV/√Hz, 40MSPS
    • 80mW/ch at CW mode
  • Excellent device-to-device gain matching
    • ±0.5dB (typical) and ±1.1dB (max)
  • Low harmonic distortion
  • Fast and consistent overload recovery
    • Passive mixer for CWD
    • Low close-in phase noise
    • –156dBc/Hz at 1kHz off 2.5MHz carrier
    • λ / 16 phase resolution 
    • Supports 16X, 8X, 4X, and 1X CW clocks
    • 12dB suppression on 3rd and 5th harmonics
    • CWD high-pass filter rejects undesired low-frequency signals < 1kHz
  • 15mm×15mm NFBGA-289 small package

Applications

  • Medical ultrasound imaging
  • Nondestructive evaluation equipment
  • Sonar imaging equipment
  • Multi-channel, high-speed data acquisition

Simplified Block Diagram

Block Diagram - Texas Instruments AFE5818 Ultrasound Analog Front End (AFE)
Inilathala: 2016-06-14 | Na-update: 2022-03-11