Analog Devices MAX2087J Product Info

• 8 Full Channels of 5-Level Pulser, T/R-Switch, Integrated AFE, with 14-bit ADC and CWD Mixers
• 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 14ns Propagation Delay; Active Return to Zero (Clamp); Programmable Current Capability; and Low Quiescent 4.3mV/ch Power Dissipation
• 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

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 ou