8-channel Tx/Rx chipset enables highest image quality, lowest power
Consisting of the LM96511 receive analog front end (AFE), the LM96530 transmit/receive switch, the LM96550 transmit pulser, and the LM96570 configurable transmit beamformer, an eight-channel PowerWise transmit/receive chipset is offered as the first of its kind for portable ultrasound systems. The high-level of integration allows system designers to build lightweight 128-channel portable ultrasound systems with enhanced image quality and diagnostics in a small footprint.
The LM96511 integrates eight channels of LNA; DVGA; a 12-bit 40 to 50-MHz ADC with LVDS data outputs, and eight demodulators for CW Doppler beamforming. The AFE provides the lowest B-mode power consumption at 110 mW per channel (claimed 10% lower than the competition) and channel-to-channel gain matching of ±0.06 dB typ, which is four times better than the closest comparable AFE.
The LM96530 contains eight transmit/receive switches with integrated clamping diodes and offers an individual channel shutoff capability. Compared to other T/R switches, the LM96530 provides 55% better input referred noise (0.5 nV/√Hz) and 53% lower on-resistance (16 Ω), thereby increasing receiver sensitivity and image resolution. The LM96530 reduces board space fourfold over discrete solutions.
The LM96550 contains eight pulsers with a damper circuit that generates ±50-V bipolar pulses with peak currents up to 2 A and pulse rates up to 20 MHz. The LM96570 provides an order-of-magnitude jitter performance improvement (25 ps p-p) over beamforming traditionally done in FPGAs. The chipset is supported with comprehensive evaluation kits, reference schematics, and tools. (Ea/1,000: LM96511, $55; LM96530, $8; LM96550, $20; LM96570, $6 — LM96511, available now; LM96530/50/70, available November.)
National Semiconductor , Santa Clara , CA
Sales 800-272-9959
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