General Description

The MAX2078 octal-channel ultrasound front-end is a fully integrated bipolar, high-density octal-channel ultra sound receiver optimized for low cost, high-channel count, high-performance portable and cart-based ultra sound systems. The easy-to-use IC allows the user to achieve high-end 2D, PW, and CW Doppler (CWD) imaging capability using substantially less space and power. The highly compact imaging receiver lineup, including low-noise amplifier (LNA), variable-gain amplifier (VGA), and anti-alias filter (AAF), achieves an ultra-low 2.4dB noise figure at RS = RIN = 200Ω at a very low 64.8mW per channel 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. The bipolar front-end has also been optimized for excellent low-velocity 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.

Features

♦ 8 Full Channels of LNA, VGA, AAF, and CWD

   Mixers in a Small, 10mm x 10mm TQFN Package

♦ Pin Compatible with MAX2077 with LNA, VGA,

   and AAF in 10mm x 10mm TQFN Variant

♦ Ultra-Low Full-Channel Noise Figure of 2.4dB at

   RIN = RS = 200Ω

♦ 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 (234mW per

   Channel in CWD Mode)

♦ Selectable Active Input-Impedance Matching of

   50Ω, 100Ω, 200Ω, and 1kΩ

♦ 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)

♦ Fully Integrated, High Dynamic Range CWD

   Beamformer with Near-Carrier SNR of 154dBc/Hz

   at 1kHz Offset from a 1.25MHz, 200mVP-P Input

   Clutter Signal

Applications

   Medical Ultrasound Imaging

   Sonar