MAX2087J

The MAX2087J is a highly integrated 8-channel ultrasound transceiver that is optimized for high channel density, high performance ultrasound systems.

The octal five-level, high-voltage (HV) pulser device generates high-frequency HV bipolar pulses for driving piezoelectric transducers in ultrasound systems from two independent pairs of HV supplies. Each channel can transmit up to 200Vpp with up to 2A 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 beam-forming resulting in dramatic savings in the number of interconnects and FPGA I/Os. The embedded digital resources are programmed via a high-speed serial interface and supports 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 MAX2087J 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.

Maximum JESD204b serial output data rate is 6Gbps.

Applications

• 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