TI TX734四路高压超声波系统应用方案
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TI公司的TX734是全集成的四路高压超声波脉冲发生器,输出电压高达±75-V摆幅,峰值输出电流高达±2A. TX734集成了低压输入逻辑,电平转换,栅极驱动器,以及P沟和N沟MOSFET.逻辑电压可低至2.5V,图像输出频率可高达15MHz,可应用于手提医疗超声系统和中等范围超声系统以及无损伤材料检测系统.本文介绍了TX734的主要特性,方框图以及超声波系统方框图虾和所用的主要元器件,包括放大器,模拟前端, 数据转换器, 处理器(DSP – 数字信号处理)和脉冲发生器和开关.
The TX734 is a fully integrated, quad channel, high-voltage ultrasound pulser. It can be used in ultrasound applications that require a 3-level high-voltage pulse pattern. The output stages are designed to deliver up to ±2-A peak output currents, with up to ±75-V swings.
The TX734 is a complete transmitter solution with low-voltage input logic, level translators, gate drivers, and P-channel and N-Channel MOSFETs for each channel.
The TX734 supports logic levels down to 2.5 V. It also incorporates an active damping stage for clean RTZ waveform generation. The fast clamping to ground results in high pulse symmetry and low 2nd order distortion.
The TX734 is available in a QFN-64, 9 mm x 9 mm package. It is specified for operation from 0°C to 70°C.
TX734主要特性:
Quad Channel
Voltage: ±75 V
Peak Output Current: ±2 A
Active Damping
True 3-Level RTZ
Internally Activated
Imaging Output Frequency: Up to 15 MHz
Logic Inputs: 2.5 V to 5 V
Matched Delay: ±2.5 ns
Low HD2 Distortion: -40 dB, at 5 MHz
Integrated:
Level Translator
Driver
High-Voltage Output Stage
Active Damping Stage
Output Blocking Diodes
Dedicated CW Function
Low Noise Operation
Minimal External Components
Small PowerPAD Package: 9 mm × 9 mm QFN-64
TX734应用:
Medical Ultrasound
Portable Systems
Mid-Range Systems
NDT Material Inspection
图1.TX734方框图
图2.超声波系统方框图(Ultrasound System Block Diagram)
Medical and industrial ultrasound systems use focal imaging techniques to achieve imaging performance far beyond what can be achieved through a single-channel approach. Using an array of receivers, a high-definition image can be built by time shifting, scaling and intelligently summing echo energy, making it possible to focus on a single point in the scan region. By subsequently focusing on a different point, a high quality image is assembled.
In addition to advancements to improve image quality, semiconductor technology has also enabled ultrasound equipment to become more compact, with cart-based systems increasingly complemented by portable and handheld units. TI offers a range of solutions that deliver the low power consumption and high performance that ultrasound systems require, including:
超声波系统所用主要元件:
放大器:
VCA2611
The VCA2616 and VCA2611 are dual, Low-Noise Preamplifiers (LNP), plus low-noise Variable Gain Amplifiers (VGA)
VCA2616
The VCA2616 and VCA2611 are dual, Low-Noise Preamplifiers (LNP), plus low-noise Variable Gain Amplifiers (VGA)
VCA2612
The VCA2612 is a highly integrated, dual receive channel, signal processing subsystem
VCA2613
The VCA2613 is a dual, Low-Noise Preamplifier (LNP), plus low-noise Variable Gain Amplifier (VGA). The combination of Active Termination (AT) and Maximum Gain Select (MGS) allow for the best noise performance
VCA2614
The VCA2614 is a highly integrated, dual receive channel, Variable Gain Amplifier (VGA) with analog gain control
VCA2615
The VCA2615 is a dual-channel, variable gain amplifier consisting of a Low-Noise Preamplifier (LNP) and a Variable-Gain Amplifier (VGA)
VCA2617
The VCA2617 is a dual-channel, continuously variable, voltage-controlled gain amplifier well-suited for a variety of ultrasound systems as well as applications in proximity detectors and test equipment
VCA2618
The VCA2618 is a highly integrated, dual receive channel, Variable Gain Amplifier (VGA) with analog gain control
VCA2619
The VCA2619 is a highly integrated, dual receive channel, Variable Gain Amplifier (VGA) with analog gain control
VCA8500
The VCA8500 is an 8-channel variable-gain amplifier consisting of a low-noise amplifier (LNA) and a variable-gain amplifier (VGA) with best in class noise-power performance
VCA8613 and VCA8617
Are 8-channel variable-gain amplifier consisting of a low-noise amplifier (LNA) and a variable-gain amplifier (VGA)
模拟前端(AFE):
AFE5801
The AFE5801 is an analog front end that contains eight variable-gain amplifiers (VGA), each followed by a high-speed (up to 65MSPS) ADC, for a total of eight ADCs per device
AFE5851
The AFE5851 is the first 16-channel AFE available for the ultrasound market
AFE5804
The AFE5804 and AFE5805 are integrated analog front-end solutions designed specifically for portable ultrasound systems
AFE5805
The AFE5804 and AFE5805 are integrated analog front-end solutions designed specifically for portable ultrasound systems
数据转换器:
ADS5281
ADS5281 family provides eight high-performance ADCs in a small 64-pin QFN package, making it possible to implement high channel counts in high-performance ultrasound and other medical imaging systems
ADS5282
ADS5281 family provides eight high-performance ADCs in a small 64-pin QFN package, making it possible to implement high channel counts in high-performance ultrasound and other medical imaging systems
ADS5287
ADS5281 family provides eight high-performance ADCs in a small 64-pin QFN package, making it possible to implement high channel counts in high-performance ultrasound and other medical imaging systems
处理器(DSP – 数字信号处理)
TMS320DM644x
Highly integrated SoCs that combine the power of an ARM926 processor at TMS320C64x+ DSP core
TMS3206452
Delivers a lower system cost by offering more peripheral integration on a high performance core
TMS320C6455/TMS3206455BZTZ
Based on the TMS3230C64x+ core in 720-MHz, 850-MHz, 1-GHz and 1.2-GHz versions, and offering high-performance multiprocessing via Serial RapidIO® and other high-bandwidth peripherals
TMS320C6415
A high-performance, fixed point DSP based on TI’s VelociTI™ VLIW architecture and featuring performance of up to 8,000 MIPS at a clock rate of 1-GHz
TMS320DM6437
The highest performance fixed-point DSPs in the TMS320C6000™ DSP platform, with up to 7,200 MIPS at a clock rate of 900 MHz
TMS320DM648
Part of the TMS320C64x+ series of DSPs with application-specific hardware logic, on-chip memory and additional on-chip peripherals
TMS320C6474
Features three 1-GHz cores on a single chip, providing maximum performance density and cost, power and board space savings while offering an easy migration path
OMAP35x
Based on the enhanced OMAP™ 3 architecture, and designed to provide best-in-class video, image and graphics processing. Also includes state-of-the-art power management techniques for high performance portable and handheld products
TMS320C6745/6747
Low power, floating point DSPs that include a combination of connectivity peripherals, low power and low cost that has previously only been available with fixed point devices
脉冲发生器和开关
TX734
The TX734, the first device in the TX7xx family, is a fully integrated, quad channel, high-voltage pulser, specifically designed for medical ultrasound applications that require a 3-Level high-voltage pulse pattern
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