Microchip MD1822DB1 Manual

Microchip Ikke kategoriseret MD1822DB1

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Supertex inc.

www.supertex.com

MD1822DB1

Doc.# DSDB-MD1822DB1

A032913

MD1822 + TC7920: Three Level

High Speed ±100V 2.0A Pulser Demoboard

Demoboard Features

►Ultrasound high voltage & high current RTZ pulser

►MD1822 driving TC7920 with two pairs of MOSFETs

►3-level voltage pulse waveform outputs

►±2.0A source and sink current capability

►40 MHz frequency clock on board

►Programmable logic waveform generation

►JTAG connection for CPLD programming

►Connectors for external clock and signals

►3.3V CMOS logic interface

Applications

►Medical ultrasound imaging

►Piezoelectric transducer drivers

►Material aw detection

►ATE and waveform generator

►Transducer power driver

►Capacitive and MEMS sensor driver

►Ultrasonic NDT detection and sonar ranger

General Description

The MD1822DB1 is a demoboard for the three level ±100V

2.5A pulser chip-set of the MD1822 MOSFET driver and the

TC7920 MOSFET. The demoboard consists of one MD1822

in the 3x3mm 16-lead QFN package driving the TC7920

which has two pairs of high speed and high voltage compli-

mentary P- and N-MOSFETs in in one 4x4mm, 8-lead DFN

package. This circuit is an ideal, cost-optimized, high voltage

and high current RTZ ultrasound transmit pulser.

The CPLD-programmable logic circuit (40 MHz crystal os-

cillator) generates accurately timed high-speed waveforms

on a separate CPL board. Multiple frequency and waveform

combinations can be selected as bipolar pulse waveforms.

An external clock input can be used if the on-board oscil-

lator is disabled. The external trigger input can be used to

synchronize the output waveforms. There are ve push

buttons for selecting demonstration waveform, frequency,

phase, and mode functions. Color LEDs indicate the demo

selection states. Jumpers on the board can select either the

330pF/2.5k on-board load, or user test loads.

Block Diagram

Waveform

Generator

CPLD

+3.3V

OSC

JTAG

EXCLK

EXT

CLKIN

WAVE

FREQ

SEL

CLMP

ENAB

LED1

LED2

PWR

ENA

MOD

2.5k

330pF

XDCR

TC7920

-100V

VNN

+100V

VPP

VSS/VL

MD1822

+12V

VDD/VH

40MHz

EXTRG

INA

INB

INC

IND

Produkt Specifikationer

Mærke:	Microchip
Kategori:	Ikke kategoriseret
Model:	MD1822DB1

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