Maxim 公司的MAX2077是八路超聲波前端,是全集成的雙極高密度的八路超聲波接收器,包括了低噪音放大器(LNA),可變增益放大器(VGA),抗混淆濾波器(AAF),5MHz時的參考噪音為23nV/√Hz, 每路的功耗僅為64.8mW,可用于高性能手提和車載超聲波系統以及聲納系統.本文介紹了MAX2077的主要特性,功能方框圖以及典型應用電路.
The MAX2077 octal-channel ultrasound front-end is a fully integrated, bipolar, high-density, octal-channel ultrasound receiver optimized for low-cost, high-channel count, high-performance portable and cart-based ultrasound systems. The easy-to-use IC allows the user to achieve high-end 2D and PW imaging capability using substantially less space and power. The highly compact imaging receiver lineup, including a low-noise amplifier (LNA), variable-gain amplifier (VGA), and antialias filter (AAF), achieves an ultra-low 2.4dB noise figure at RS = RIN = 200at a very low 64.8mW perchannel power dissipation. The full imaging receiver channel has been optimized for second-harmonic imaging with -64dBFS second-harmonic distortion performance with a 1VP-P 5MHz output signal and broadband SNR of > 68dB* at 20dB gain. The bipolar front-end has also been optimized for excellent lowvelocity PW and color-flow Doppler sensitivity with an exceptional near-carrier SNR of 140dBc/Hz at 1kHz offset from a 5MHz 1VP-P output clutter signal. The MAX2077 octal-channel ultrasound front-end is available in a small 8mm x 8mm, 56-pin thin QFN or 10mm x 10mm, 68-pin thin QFN package with an exposed pad and is specified over a 0°C to +70°C temperature range. To add CW Doppler capability, replace the MAX2077 with the MAX2078.
MAX2077主要特性:
_ 8 Full Channels of LNA, VGA, and AAF in a Small, 8mm x 8mm, 56-Pin or 10mm x 10mm, 68-Pin TQFN Package
_ Ultra-Low Full-Channel Noise Figure of 2.4dB at RIN = RS = 200ohm,
_ Low Output-Referred Noise of 23nV/√Hz at 5MHz, 20dB Gain, Yielding a Broadband SNR of 68dB for Excellent Second-Harmonic Imaging
_ High Near-Carrier SNR of 140dBc/Hz at 1kHz Offset from a 5MHz, 1VP-P Output Signal, and 20dB of Gain for Excellent Low-Velocity PW and Color-Flow Doppler Sensitivity in a High-Clutter Environment
_ Ultra-Low Power 64.8mW per Full-Channel (LNA, VGA, and AAF) Normal Imaging Mode
_ Selectable Active Input-Impedance Matching of 50ohm, 100 ohm , 200 ohm, and 1k ohm
_ Wide Input-Voltage Range of 330mVP-P in High LNA Gain Mode and 550mVP-P in Low LNA Gain Mode
_ Integrated Selectable 3-Pole 9MHz, 10MHz, 15MHz, and 18MHz Butterworth AAF
_ Fast-Recovery, Low-Power Modes (< 2μs)
_ Pin Compatible with the MAX2078 Ultrasound Front-End with CW Doppler (MAX2077 68-Pin Package Variant)
MAX2077應用:
Medical Ultrasound Imaging
Sona
圖1.MAX2077功能方框圖
圖2.MAX2077典型應用電路
圖3.MAX2077典型應用電路(續)
