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8-Channel, High-Performance, Low-Power Fully-Integrated Ultrasound Transceiver with 3-Level Pulser and T/R Switch

Industry's First Fully Integrated High Performance Ultrasound Transceiver

Product Details

Key Features

Applications/Uses

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Key Features

  • 8 Full Channels of 3-Level Pulser, T/R-Switch, Integrated AFE, with 14-bit ADC and CWD Mixers and Significant Digital Post-Processing Capability
  • Pulsers Feature Internal Floating Power Supplies and a DirectDrive® Architecture, Eliminating the Need for External Signal High-Voltage Capacitors
  • Embedded Digital Resources Support Transmit Beamforming Dramatically Reducing the Number of Interconnects and FPGA I/Os
  • High-Performance Pulser Characteristics: -40dBc for 2nd Harmonic Distortion at 5MHz; Low 13.5ns Propagation Delay; Active Return to Zero (Clamp); Programmable Current Capability; and Low Quiescent 4mW/ch Power Dissipation
  • Fast Pulser Slew Rates of 8.5V/ns (220pF||1KΩ)
  • Ultra-Low, Full-Channel Receiver Noise Figure of 2.4dB at RIN = RS = 200Ω
  • High Dynamic Range Receiver with 81dBFS SNR at FIN = 5MHz and 2MHz Bandwidth
  • Low-Power (153mW per Channel) Receiver (Includes LNA, VGA, AAF, and ADC) Normal Imaging Mode at 65Msps at Full Performance, and a 100mW per Channel Ultra-Low-Power Mode
  • Selectable Active Input Impedance LNA with 50, 100, 200, and 400 Input Selections (LNA Gain = 18dB); along with an Open Feedback Loop Option with ~3KΩ Input Impedance at 2MHz and 1.2 KΩ at 5MHz
  • Integrated Analog High-Pass Filter, Selectable 3 Pole 10, 15, 20, and 30MHz Butterworth Anti-Alias Filter and a Bypassable Programmable Digital High-Pass Filter
  • Fully Integrated High-Performance CWD Beam-Former with Separate I and Q Mixers for Improved Dynamic Range (157dBc/Hz Dynamic Range per Channel at 1KHz from a 2MHz Carrier) and Sensitivity
  • Bypassable Demodulator Has 96dB SNR NCO, 16 x M Tap Polyphase Decimation Filter with Programmable Decimation Between 2 ≤ M ≤ 32

DirectDrive is a registered trademark of Maxim Integrated Products, Inc.

Applications/Uses

  • Medium and High-Performance Cart-Based Ultrasound Systems
  • Medium and High-Performance Portable Ultrasound Systems
  • Echocardiograph Systems
  • Real-Time 4D Ultrasound Systems
  • Shear Wave Elastography Systems

Description

The MAX2086 is a highly integrated, 8-channel ultrasound transceiver optimized for high channel density, high-performance ultrasound systems.

The octal three-level, high-voltage (HV) pulser device generates high-frequency HV bipolar pulses for driving piezoelectric transducers in ultrasound systems from HV supplies. Each channel can transmit up to 200VPP with up to 2.5A current capability and features an integrated 2A active clamp (Return to Zero). The current capability can be programmed down to 0.4A.

The pulser can be controlled using embedded digital resources (SRAM and state machine) that can be used to support transmit beamforming resulting in dramatic savings in the number of interconnects and FPGA I/Os. The embedded digital resources are programmed through a high-speed serial interface and support sophisticated transmit techniques, like PWM, for burst shaping and apodization for beam shaping.

Alternatively, the device can be controlled in a conventional manner by an external digital source (FPGA) through dedicated CMOS logic inputs.

The MAX2086 also features eight independent low-noise, low-impedance active T/R switches. The highly compact receiver includes LNA, VGA, AAF, ADC, and several digital post-processing circuits (including a digital HPF). It achieves an ultra-low, 2.4dB noise figure at RS = RIN = 200Ω at a low 143mW per channel power dissipation when sampling at 50Msps. Additionally, there is a lower power mode of operation that achieves 100mW per channel, but has reduced AC performance. The receive channel has been optimized for second harmonic imaging with -70dBFS second harmonic distortion performance at FIN = 5MHz over the full TGC range. Dynamic range has also been optimized for exceptional pulsed and color flow Doppler performance under high clutter conditions. The full receive channel exhibits an outstanding 81dBFS SNR at 5MHz with a 2MHz bandwidth. The bipolar front-end and CMOS ADC have also been optimized for an exceptionally low, near-carrier modulation noise of -141dBc/Hz at 1KHz offset from a 5MHz tone for excellent low-velocity Doppler sensitivity.

The device also includes an 8-channel CWD beam-former for a full Doppler solution. Separate mixers for each channel are made available for optimal CWD sensitivity, yielding an impressive 156dBc/Hz dynamic range per channel at 1KHz offset from a 2MHz carrier.

Furthermore, the MAX2086 also contains several digital post-processing options associated with digital mix-to-baseband operation. The device contains a 96dB SNR NCO with a programmable frequency range of 800KHz to 17.6MHz with a <1KHz resolution. There is also a demodulator circuit followed by a decimating FIR filter that can be programmed for different decimation ratios, where M can be programmed at any integer from 2 to 32. A 16xM tap low-pass FIR decimation filter is also provided. A post decimation-filter digital gain adjustment is also available.

When mix-to-baseband is used, it is possible to reduce the number of LVDS output lanes required (from 10 pairs to 6 pairs) if decimation rates are ≥ 4.

The MAX2086 is offered in a 23mm x 10mm BGA package with 0.8mm ball pitch, and is specified over a 0°C to +85°C temperature range.

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .