AD9271能够为车载和便携式超声诊断设备设计工程师提供空前的高集成度。
其中8通道的每一通道都有一个低噪声放大器(LNA)、用于连续波(CW)多普勒模8×6差分交叉点开关、可变增益放大器(VGA)、抗混淆滤波器(AAF)和12 bit 模数转换器(ADC)。AD9271工作电压为1.8 V,以50 MSPS采样速率工作每通道功耗仅为150 mW。AD9271将8通道集成在一个16 mm × 16 mm,100引脚TQFP封装内,使超声诊断系统设计工程师增加通道数并增强图像质量,而无需加大设备的尺寸和功耗。
AD9271由于将许多高性能单元集成到单芯片内,所以能为急诊室、医生办公室和门诊所采用的便携式和车载超声系统提供优异的图像质量。AD9271的每一通道都具有30 dB可变增益范围,1.2 nV/√Hz@5 MHz折合到输入端噪声典型值、157 dB/√Hz, 输入动态范围、一个可编程三阶巴沃斯特(Butterworth)抗混淆滤波器、一个具有70 dB 信噪比(SNR)和80 dB无杂散动态范围(SFDR)的12 bit ADC。仅在显示模式下,可以关闭个别通道以延长电池寿命;或者在CW模式下当使用LNA时可以关闭ADC通道。
1 主要特性:
8 channels of LNA, VGA, AAF, and ADC
Low noise preamplifier (LNA)
Input-referred noise = 1.2 nV/√Hz @ 7.5 MHz typical
I-programmable gain = 14 dB/15.6 dB/18 dB
ingle-ended input; VIN maximum = 400 mV p-p/ 333 mV p-p/250 mV p-p
Dual-mode active input impedance matching
andwidth (BW) >70 MHz
Full-scale (FS) output = 2 V p-p diff
Variable gain amplifier (VGA)
Gain range = ?6 dB to +24 dB
Linear-in-dB gain control
Antialiasing filter (AAF)
3rd-order Butterworth cutoff
rogrammable from 8 MHz to 18 MHz
Analog-to-digital converter (ADC)
12 bits at 10 MSPS to 50 MSPS
R = 70 dB
FDR = 80 dB
erial LVDS (ANSI-644, IEEE 1596.3 reduced range link)
Data and frame clock outputs
Includes crosspoint switch to support continuous wave (CW) Doppler
Low power, 150 mW/channel at 12 bits/40 MSPS (TGC)
90 mW/channel in CW Doppler
ingle 1.8 V supply (3.3 V supply for CW Doppler output bias)
Flexible power-down modes
Overload recovery in <10 ns
Fast recovery from low power standby mode, <2 μs
100-pin TQFP
2 应用:
Medical imaging/ultrasound
Automotive radar
图1。应用方框图
图2。方框图
图3。评板电路图,DUT 模拟输入电路
图3。评板电路图,DUT 模拟输入电路 (续)
图4。评板电路图,DUT ,VREF和增益电路
图5。评板电路图,时钟和CW Doppler电路