Microchip MD1822DB1 Manual


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Supertex inc.
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
6
JTAG
EXCLK
EXT
CLKIN
5
WAVE
FREQ
SEL
CLMP
ENAB
LED1
LED2
PWR
ENA
MOD
RL
2.5k
CL
330pF
XDCR
TC7920
-100V
VNN
+100V
VPP
X1
VSS/VL
MD1822
+12V
VDD/VH
40MHz
EXTRG
EN
PE
INA
INB
INC
IND


Produkt Specifikationer

Mærke: Microchip
Kategori: Ikke kategoriseret
Model: MD1822DB1

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