POWER AND LINEAR IC SOLUTIONS

Four New Analogue Front-End Devices Enable Portable and Handheld Ultrasound

Texas Instruments’ AFE58xx Analogue Front End (AFE) devices integrate multiple high-performance analogue circuits, providing superior image quality for a wide range of ultrasound applications. The devices consume less power and are more than 50% smaller than comparable devices in the market.



Despite their small size and low power, all four devices in the series maintain low noise figures, allowing designers to offer portable and handheld ultrasound systems with longer battery life and better image quality.

The AFE5805 provides low power consumption and low noise for portable to mid-range ultrasound systems. It offers 122mW per channel power efficiency and a noise figure of 0.85nV/√Hz at 2MHz, making it suitable not only for portable equipment but also for high channel density mid-range systems.

The device integrates eight Low Noise Amplifier (LNA) channels, voltage controlled attenuator, programmable gain amplifier, low pass filter and a 12-bit 50MSPS Analogue/Digital Converter (ADC) with LVDS (Low Voltage Differential Signalling) data outputs.



The AFE5804 is pin to pin compatible and allows migration to a lower power solution, 102mW/channel at 1.25nV/√Hz and 40MSPS. Mode control enables flexibility when programming the level of noise and power consumption to optimise a system.

Both the AFE5805 and the AFE5804 are available in a 15mm x 9mm package.

The newest parts in the family, the AFE5851 and AFE5801, reduce power consumption and package size further to support the new market for handheld ultrasound systems. The AFE5851 is the first 16-channel AFE for the ultrasound market. Both devices are available in an ultra-small 9mm x 9mm package.

The AFE5851 features a power efficiency of 39mW/channel at 32.5MSPS. It integrates 16 VGAs (Variable Gain Amplifiers) and eight 12-bit 65MSPS ADCs. Each ADC is therefore shared between two VGAs and each VGA differential output is sampled at alternate clock cycles to optimise power efficiency. The ADC has scalable power consumption to reduce power use with lower sampling rates. The AFE5851's high channel count and low power features allow for increased channel density in handheld systems.

The AFE5801 offers 50mW/channel at 30MSPS and 58mW/channel at 50MSPS. It integrates eight VGAs and eight 12-bit 65MSPS ADCs with LVDS data outputs.

Features

• Integrated analogue front ends
• Low noise amplifier (AFE5804/05 only)
• Voltage controlled attenuator
• Programmable gain amplifier
• Low pass filter
• Analogue/digital converter
• Best in class noise and power performance
• Improved dynamic range
• Enable portability with ultra-small package size
• Fast overload recovery

Applications

• Ultrasound equipment
  • Handheld
  • Portable
  • Mid-range

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For further information, including the Texas Instruments Medical Applications Guide and AFE5805 Datasheet, click here