Microchip Technology HV2918, Руководство пользователя

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HV2918 ANALOG SWITCH
EVALUATION BOARD
USER’S GUIDE

2020 Microchip Technology Inc. DS500000000A-page 9
Chapter 1. Product Overview
1.1 INTRODUCTION
The HV2918 Analog Switch Evaluation Board (EV19W62A) works with the Microchip
HV MUX Controller Board (ADM00825) to provide no high-voltage bias, low harmonic
distortion, 32-channel, high-voltage analog switch demonstration, including basic
switch on/off operation. The boards also include 2:1 MUX operation to transmit ±100V
high-voltage pulse burst from two built-in MD1822 and TC6320 pulser circuits.
1.2 HV2918 DEVICE SHORT OVERVIEW
The HV2918 device is a no high-voltage bias, low harmonic distortion, 32-channel
(16 2:1 MUX), high-voltage analog switch (with bleed resistors in SW pins). It is
designed to be used in applications requiring high-voltage switching, controlled by
low-voltage control signals, such as medical ultrasound imaging, driving piezoelectric
transducers and in printers. The typical 6

on-resistance analog switch can pass the
analog pulsed signal up to ±2.7A of current, ±100V of voltage and 2.5 µs of pulse width
without high-voltage supplies, such as ±100V. It requires only a +5V single bias voltage
supply of V
DD
and V
LL
for the on/off switch operation. The user can also use +3.3V
instead of +5V in the Logic Voltage, V
LL
, in order to get lower power consumption.
The HV2918 device has a digital serial interface to control the 32 analog switches
individually. The digital interface clock operates up to 66 MHz.
HV2918 has an asymmetric topology to implement small size, compared to other
no high-voltage bias analog switch products. In the asymmetric topology, the SW pin
can pass a high-voltage pulsed signal, applied to the Y pin, when the switch is in the
ON state. When the switch is in the OFF state, high voltage should not be applied to
the SW pin. In medical ultrasound systems, the Y pin is connected to Tx/Rx and the
SW pin is connected to a single piezoelectric transducer element in order to avoid
high-voltage at the SW pin during the switch OFF state.
1.3 HV2918 ANALOG SWITCH EVALUATION BOARD FEATURES
• HV2918 No High-Voltage Bias, Low Harmonic Distortion, 32-Channel,
(16 2:1 MUX), High-Voltage Analog Switch (with Bleed Resistors in SW Pins)
• Designed to work with the Microchip HV MUX Controller Board (ADM00825)
• Two 2:1 MUX with built-in MD1822 and TC6320 Pulsers
• 5 MHz 3-Level High-Voltage Pulse Burst Outputs
• On-Board 330 pF//2.5 k

Dummy Load per SW6, SW7, SW24, SW25 Pins
• Pulser On/Off and Time Domain Control through the PC GUI and the HV MUX
Controller Board