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[原创] TI AFE5832LP 32路超声模拟前端(AFE)解决方案

关键词:医疗电子 超声模拟前端(AFE) 声纳设备 AFE5832LP

时间:2019-05-17 11:19:40       来源:中电网

TI公司的AFE5832LP是32路高性能超声模拟前端(AFE),每路的功耗为18.5mW,低噪音4-nV/√Hz,12位分辨率,50MSPS输出和无源CW混合器.器件有两个芯片的多芯片模块(MCM)来实现:一个VCA芯片和一个ADC芯片.VCA芯片有32路,和16路ADC芯片接口.每个ADC通路交替转换成一个奇数和偶数VCA通路.而VCA芯片的每个通路能以时间增益补偿(TGC)模式或连续波(CW)模式进行配置.TGC模式,每路包括低噪音放大器(LNA),可编衰减器(ATTEN),可编增益放大器和三阶低通滤波器(LPF);LNA增益可编程为21dB,18dB或15dB;ATTEN支持衰减范围0dB到36dB,并对衰减进行数字控制,PGA提供增益选择从21 dB 到 27 dB,每步为3 dB.LPF的截止频率在10MHz和25MHz之间,以支持不同频率的超声波应用.谐波失真为–55 dBc,相位分辨率λ/16,三次和五次谐波抑制为12dB,LVDS接口速度高达1Gbps,主要用在医疗超声图像,非破坏性评估设备,声纳图像设备和探针电子学.本文介绍了AFE5832LP主要特性,简化框图,以及32路AFE评估板AFE5832 EVM主要特性,建立概述图,用于LVDS俘获的评估板AFE5832 EVM和TSW1400EVM硬件建立图以及评估板框图与电路图和材料清单.

The AFE5832LP is a highly integrated, analog frontend(AFE) solution specifically designed for portableultrasound systems where high performance, lowpower, and small size are required.

The device is realized through a multichip module (MCM) with two dies: 1 VCA die and 1 ADC die. The VCA diehas 32 channels that interface with the 16 channels of the ADC die. Each ADC channel alternately converts anodd and an even VCA channel.

Each channel in the VCA die can be configured in either of two modes: time-gain-compensation (TGC) mode orcontinuous wave (CW) mode. In the TGC mode, each channel includes a low-noise amplifier (LNA), aprogrammable attenuator (ATTEN), a programmable gain amplifier and a third-order, low-pass filter (LPF). TheLNA gain is programmable to 21 dB, 18 dB, or 15 dB. The ATTEN supports an attenuation range of 0 dB to 36dB, with digital control for the attenuation. The PGA provides gain options from 21 dB to 27 dB in steps of 3 dB.

The LPF cutoff frequency can be set between 10 MHz and 25 MHz to support ultrasound applications withdifferent frequencies. In the CW mode, the output of the LNA goes to a low-power passive mixer with 16selectable phase delays. Different phase delays can be applied to each analog input signal to perform an on-chipbeamforming operation. A harmonic filter in the CW mixer suppresses the third and fifth harmonic to enhance the sensitivity of the CW Doppler measurement.

The 16 channels of the ADC die can be configured to operate with a resolution of 12 bits or 10 bits. The ADCresolution can be traded off with conversion rate and can operate at maximum speeds of 80 MSPS and 100MSPS at 12-bit and 10-bit resolution, respectively. Because each ADC alternately converts two VCA channels,the resulting maximum sample rate of each of the 32 channels of the AFE is 40 MSPS and 50 MSPS in the 12-bit and 10-bit modes, respectively. The ADC is designed to scale its power with sampling rate. The outputinterface of the ADC comes out through a low-voltage differential signaling (LVDS), which can easily interfacewith low-cost field-programmable gate arrays (FPGAs).A very low-power AFE solution makes it suitable for system with strict battery-life requirement.

The AFE is available in a 15 mm × 15 mm 289-pin NFBGA package and is pin-compatible with the AFE5832family.

AFE5832LP主要特性:

1• 32-Channel AFE for Ultrasound Applications:
– LNA, Attenuator, LPF, ADC, and CW Mixer
– Digital Time Gain Compensation (DTGC)
– Total Gain Range: 0 dB to 48 dB
• Low-Noise Amplifier (LNA) With ProgrammableGain:
– Low Current Noise of 1pA/rtHz
– Gain: 21 dB, 18 dB, and 15 dB
– Linear Input Range: up to 700 mVPP
• Programmable Attenuator (ATTEN):
– Attenuation Range (Steps of 0.125 dB):0 to 36 dB
– Digital TGC Engine
• Programmable Gain Amplifier (PGA):
– Gain: 21 dB, 24 dB, and 27 dB
• Third-Order, Linear-Phase, Low-Pass Filter (LPF):
– Cut-off Frequency From 10 MHz to 25 MHz
• 16 ADCs Converting at 12-Bit, 80 MSPS or 10-Bit,100 MSPS:
– Each ADC Converts Two Sets of Inputs at HalfRate
– 12-Bit Mode: 72-dBFS SNR
– 10-Bit Mode: 61-dBFS SNR
• TGC Mode Power :
– Lowest Power of 18.5 mW/Ch in Low PowerMode, 4 nV/rtHz,10-Bit,20 MSPS, LVDS (2xrate)
– 27.8 mW/Ch at 3 nV/rtHz in Low Noise Modeat 12-Bit, 40 MSPS
– 24.4 mW/Ch at 4 nV/rtHz in Low Power Modeat 12-Bit, 40 MSPS
• Excellent Device-to-Device Gain Matching:– ±0.5 dB (Typical)
• Harmonic Distortion: –55 dBc level
• Fast and Consistent Overload Recovery
• Continuous Wave (CW) Path With:
– Low Close-In Phase Noise of –148 dBc/Hz at1-kHz Frequency Offset off 5-MHz Carrier
– Power Consumption With No Signal: 10mW/Ch
– Phase Resolution: λ/16
– 12-dB Suppression on Third and FifthHarmonics
• LVDS Interface with a Speed Up to 1-Gbps
• Small Package: 15-mm × 15-mm NFBGA-289

AFE5832LP应用:

• Medical Ultrasound Imaging
• Nondestructive Evaluation Equipment
• Sonar Imaging Equipment
• In-Probe Electronics

图1.AFE5832LP简化框图

AFE5832 32路AFE评估板AFE5832 EVM

This user’s guide gives a general overview of the AFE5832 evaluation module (EVM) and provides ageneral description of the features and functions to be considered while using this module. This manual isapplicable to the AFE5832 analog front-end, and to the Rev. A version of the EVM hardware. TheAFE5832 EVM provides a platform for evaluating the AFE under various signal, clock, reference, and ADCoutput formats. In addition, the EVM supports the testing of the low-voltage differential signaling (LVDS)interface using the TSW1400EVM capture card.

This user’s guide refers to software AFE5832 GUI v.1.0.0 or higher, and High-Speed Data Converter Pro(HSDC Pro) Software v.4.7 and requires Microsoft Windows 7® or Windows 10® to function.

The AFE5832LP evaluation module (EVM) is a platform for evaluating the AFE5832LP device. AFE5832LP is a highly-integrated analog front-end (AFE) solution specifically designed for ultrasound systems where high performance and small size are required. The device integrates a complete time-gain-control (TGC) imaging path and a continuous-wave Doppler (CWD) path. The 32-channel device allows various power and noise combinations for optimal system performance. Therefore, the AFE5832LP is a suitable ultrasound AFE solution for high-end and portable systems.

评估板AFE5832 EVM主要特性:

32-channel complete analog front end (AFE)
Programmable-gain low-noise amplifier (LNA)
Digital time-gain compensation engine with total range of 12 dB to 51 dB
12-bit analog-to-digital converter (ADC)Requires TSW1400EVM and high-speed data converter pro software (DATACONVERTERPRO-SW) for low-voltage differential signaling (LVDS) data capture and performance evaluation.

评估板AFE5832 EVM包括:

AFE5832LP evaluation module (EVM)
Power cable
Mini-USB cable

图2.评估板AFE5832 EVM外形图
AFE5832LPEVM AFE5832LP low-power 32-ch ultrasound AFE with LVDS interface and passive CW mixer evaluation board image

图3.评估板AFE5832 EVM建立概述图

图4.用于LVDS俘获的评估板AFE5832 EVM和TSW1400EVM硬件建立图

图5.评估板AFE5832 EVM框图

图6.评估板AFE5832ReV.A EVM电路图(1)

图7.评估板AFE5832ReV.A EVM电路图(2)

图8.评估板AFE5832ReV. A EVM电路图(3)

图9.评估板AFE5832ReV. A EVM电路图(4)

图10.评估板AFE5832ReV. A EVM电路图(5)

图11.评估板AFE5832ReV. A EVM电路图(6)

图12.评估板AFE5832ReV. A EVM电路图(7)

图13.评估板AFE5832ReV. A EVM电路图(8)

图14.评估板AFE5832ReV. A EVM电路图(9)

图15.评估板AFE5832ReV. A EVM电路图(10)

图16.评估板AFE5832ReV. A EVM电路图(11)

图17.评估板AFE5832ReV. A EVM电路图(12)
评估板AFE5832ReV. A EVM材料清单:











详情请见:
http://www.ti.com/lit/ds/symlink/afe5832lp.pdf
http://www.ti.com/lit/ug/slou489/slou489.pdf
afe5832lp.pdf
slou489.pdf

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