Microchip Technology ADM00732, Руководство пользователя

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HV7358DB1
USER’S GUIDE

2020 Microchip Technology Inc. DS50002951A-page 9
Chapter 1. HV7358 Overview
1.1 INTRODUCTION
The HV7358DB1 Evaluation Board (ADM00732), working with the MUPB002
(ADM00900), provides a demonstration platform to test and characterize the HV7358.
The HV7358 is a 16-channel, 3 level,
±
80V, 1.6A ultrasound transmit beamformer. It is
designed primarily for portable medical ultrasound image applications, but it is applica-
ble to cart-based medical ultrasound systems, as well as NDT applications. The output
MOSFET transistors’ maximum current can be programmed to ±0.3A, ±0.5A, ±1.0A or
±1.6A. Each channel has a T/R switch, RX-damp switch, bleed resistor and diode
clamps to V
PP
and V
NN
.
Internal floating power supplies generate the gate drive voltages required for the TX
output FETs. These supplies function at any V
PP
/V
NN
voltage.
The 200 MHz clock retiming capability provides low jitter in CW, PW and B mode. The
clock synchronization realigns all internal logic clock signals to a master clock, reducing
the various propagation delays caused by any jitter from the external FPGA.
The HV7358 features an internal low jitter PLL clock multiplier for generating the delay
clock for the digital beamformer. The clock input can accept LVDS differential signals
from 30 MHz (min.) to 80 MHz (max.) in the PLL mode and from 30 MHz to 200 MHz
in the non-PLL mode. At 200 MHz, the incremental delay is 5 ns. The clock multiplier
is programmable by x1, x2, x3, x4, x5, x6 and x8. The transmitter outputs are
synchronized with the delay clock to reduce phase noise.
Note: The HV7358DB1 Evaluation Board uses hazardous high voltages.
Use
caution when operating the HV7358DB1.