MD1822DB1

Manufacturer Part NumberMD1822DB1
Description
ManufacturerSupertex, Inc.
MD1822DB1 datasheet
 
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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 flaw detection
ATE and waveform generator
Transducer power driver
Capacitive and MEMS sensor driver
Ultrasonic NDT detection and sonar ranger
Block Diagram
+3.3V
EXTRG
EXCLK
40MHz
OSC
CLK
EN
IN
EXT
WAVE
FREQ
SEL
CLMP
ENAB
Supertex inc.
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 five 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.
JTAG
+12V
6
VDD/VH
PE
INC
Waveform
IND
Generator
CPLD
INA
INB
5
VSS/VL
LED1
LED2
MD1822
PWR
ENA
MOD
1235 Bordeaux Drive, Sunnyvale, CA 94089
MD1822DB1
+100V
V
PP
-100V
V
NN
R
L
2.5k
C
L
330pF
TC7920
Tel: 408-222-8888
www.supertex.com
XDCR
X1

MD1822DB1 Summary of contents

  • Page 1

    ... CLMP ENAB Supertex inc. 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 ...

  • Page 2

    ... MD1822DB1 Board and PCB Layout Actual size = 100mm x 70mm Operating Supply Voltages and Current Symbol Parameter VCC Logic supply GND Circuit Ground or 0V VDD MD1822 Positive Supply VPP TC7920 HV positive supply V TC7920 HV negative supply NN Note: * Current limits should be changed according the testing waveform, frequency and duty cycles. ...

  • Page 3

    ... Schematic Diagram Supertex inc. TCK 11 TDO 24 TDI 9 VCC 15 TMS 10 VCC 26 VCC N. N.C. 12 PHASE ENA 7 28 ENABLE PWR 6 29 SEL LED3 5 30 FRE LED2 3 31 WAV 2 LED1 32 GND 25 GND 17 GND 4 ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 3 MD1822DB1 ● Tel: 408-222-8888 ● www.supertex.com ...

  • Page 4

    ... Demo Waveform B (2-Cycle DMP TX1 V NN Demo Waveform C (4.5-Cycle DMP Supertex inc. Demo Waveform A` (8-Cycle) Demo Waveform B` (2-Cycle) Demo Waveform C` (4.5-Cycle) ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 4 MD1822DB1 ● Tel: 408-222-8888 ● www.supertex.com ...

  • Page 5

    ... Demo Waveforms (cont.) Demo Waveform D (8-Cycle w/o Damping DMP Demo Waveform E (16-Cycle w/o Damping DMP Supertex inc. ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 5 MD1822DB1 ● Tel: 408-222-8888 ● www.supertex.com ...

  • Page 6

    ... Test Waveforms Fig 1: Input and output waveforms at V Fig 2: Input and output waveforms at V Supertex inc. = 10V ±70V, Load = 330pF//2.5k 10V ±70V, Load = 330pF//2.5k ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 6 MD1822DB1 ● Tel: 408-222-8888 ● www.supertex.com ...

  • Page 7

    ... Input and output waveforms at V Fig 4: Input to output delay and rise time of output 330pF(103V/13.6ns) = 2.5A. OUT Supertex inc. =10V ±70V, Load = 330pF//2.5k 10V ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 7 MD1822DB1 = ±70V, Load = 330pF//2.5k, NN ● Tel: 408-222-8888 ● www.supertex.com ...

  • Page 8

    ... Logic Power Supply Ground 0V for programming and testing only. Logic Power Supply +3.3V for CPLD programming or testing only. does not assume responsibility for use of devices described, and limits its liability Supertex inc. Supertex inc. 8 MD1822DB1 (website: http//www.supertex.com) Supertex inc. 1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: 408-222-8888 www.supertex.com ...