Analysis of United States National Semiconductor introduced the first ultrasound chipset

"In medical electronic systems, an operational amplifier or an ADC has been very difficult to meet market demand, so the United States National Semiconductor's development is a set of portable ultrasonic system for 8 channel transmitter/receiver chipset.

"United States National Semiconductor Asia Pacific Marketing Director Wu Wei said, the system for portable ultrasound equipment and ultrasound capabilities can be achieved.

The chipset includes receiving system analog front-end circuit LM96511 (http://www.national.com/mpf/lm/lm96511.html), transmit/receive switching LM96530 (http://www.national.com/pf/lm/lm96530.html#overview), launch system pulse generator LM96550 (http://www.national.com/pf/lm/lm96550.html#overview) and launch system-Beam Shaper LM96570 (http://www.national.com/pf/lm/lm96570.html#overview).

Wu Wei Qiang said: "at present, the United States National Semiconductor is the only one that can provide a full signal pathway product supplier, each chip connection optimization has been done, so you can better reduce system power consumption and costs, and accelerate the market cycle.

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It is important to note that each chip can also select other product mix, increased user flexibility.

Product overview

Receiving system analog front-end circuit LM96511

Digital variable gain amplifier technology, different gain only a difference of +-0.06.

Wu Wei Qiang explains: "If the use of simulation of variable gain amplifier, AC ripple will appear, each channel of the gain is hard to mutual alignment, and you need to additionally add digital/analog converter, operational amplifiers and filters, and other components. ”

Low power continuous time Sigma-Delta analog to digital converters, compare line mode, dynamic range, low power consumption.

And built-in brick type filter, no external filters or conduct oversampling, built-in jitter filtering circuit and overload for fast recovery.

Analog and digital output gap than the obvious.

The chip also built-in CW Doppler Beamforming, in CW mode, the phase noise of-144dBc/Hz (offset 5KHz), phase deviation rate +-0.35 degrees, while the B mode, power per channel, RTI is 110mW 0.9nV/Hz, low noise amplifier maximum input value is 380mW.

Launch reception system switch LM96530

The product with diode bridge of high voltage transmission receiving system switch supports programmable bias current and built-in clamp diodes, ensure that each channel independently switch control feature.

Chip spectrum noise density is 0.5nV/Hz, on-resistance for 16 euro and a maximum voltage of up to 60V, operating frequency is 15MHz.

LM96530 schematic diagram

Launching system pulse generator LM96550

The product supports B and CW two modes of operation, with high-voltage pulse generation function, built-in diode clamped circuit.

B mode support +-50V, operating frequency 20MHz, CW mode, +-10V, 2 harmonics-40dBc, rising down delay time alignment in 2.5ns.

You can configure the launch system Beamforming for LM96570

Each channel can generate independent programming pulse waveform for calibration, using SPI interface programming, just a trigger signal and assurance and pulse generator input seamless connection.

This product is the pulse high emissivity, delayed resolution in 80MHz 1/1280us, delay range 100us, maximum pulse waveform length to 64, and the power of only 63mW.

Currently, LM96511 analog front-end circuit demo system and evaluation kit are listed.

LM96511 demo system