MD2131 Supertex, Inc., MD2131 Datasheet

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MD2131

Manufacturer Part Number
MD2131
Description
High Speed Ultrasound Beamforming Source Driver
Manufacturer
Supertex, Inc.
Datasheet
Features
Applications
MD2131 Block Diagram
Supertex inc.
High resolution transmitting waveform
Up to 3.0A push-pull source-driving current
230V
Angle vector beamforming I-Q switcher matrix
8-bit apodization DAC and 7.5° angular resolution
Flexible frequency-resolution trade-off
Programmable aperture windowing
250MHz maximum sampling rate
25MHz ultrasound maximum frequency
PWM modulation push-pull current source
Focusing phase adjustment & chirp waveform
Fast SPI interface
2.5V CMOS logic interface
+5.0V single power supply
Low second order harmonic distortions
Medical ultrasound imaging transmit beamforming
High resolution NDT and Sonar phase arrays
HIFU transducer phase arrays beamforming and
focus scanning
Piezoelectric & MEMS transducer waveform drivers
High speed, high voltage, arbitrary waveform
generator
P-P
High Speed Ultrasound Beamforming Source Driver
maximum output, uses two DN2625 FETs
Supertex inc.
SDO
SCK
SDI
EN
CS
QA
QB
LD
IA
IB
DGND
Control
Translator
Latch
Logic
Data
Level
&
AGND
VLL
A
+2.5V
1235 Bordeaux Drive, Sunnyvale, CA 94089
Translator
SIN/COS
VREF
DAC
Table
Level
&
+V
VDD
REF
+5.0V
RFB
I
Q
C3A
C3B
Beamforming
C2A
C2B
Vector
Switch
Matrix
General Description
The MD2131 is a high-speed, arbitrary waveform, push-pull
source driver. It is designed for medical ultrasound imaging and
HIFU beamforming applications. It also can be used in NDT,
Sonar and other ultrasound phase-array focusing beamforming
applications.
The IC circuit consists the CMOS digital logic input circuits, 8-bit
current DAC for the waveform amplitude control and four PWM
current-sources. These current sources are constructed with the
high-speed in-phase and quadrature current-switch matrix and
the built-in sine and cosine angle-to-vector look-up table. The
angular resolution of the vector table is 7.5
range of 48 steps. There are four logic input signals to control the
in-phase and quadrature PWM push-pull current-source’s output
timing, frequency, cycle in the burst and waveform envelope.
The MD2131 output stage is designed to drive two DN2625
depletion N-type MOSFETs as the source-driver. The MOSFET
drains are connected to a center-tap ultrasound frequency
pulse transformer. The secondary winding of the transformer
can connect to the ultrasound piezo or capacitive transducer via
cable and with a good impendence match. The MD2131 has the
high-speed SPI compatible interface to achieve per-scan-line fast
updating the data register for changing the beamforming phase
angles and apodization amplitudes.
KA
KB
C1A
C1B
SUB
Tel: 408-222-8888
GND
PA
PB
D2
+5.0V
+5.0V
D1
+70-100V
DN2625
DN2625
+3.3V
+3.3V
V
PP
www.supertex.com
T1
O
per step with total
XDRC
MD2131

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MD2131 Summary of contents

Page 1

... The secondary winding of the transformer can connect to the ultrasound piezo or capacitive transducer via cable and with a good impendence match. The MD2131 has the high-speed SPI compatible interface to achieve per-scan-line fast updating the data register for changing the beamforming phase angles and apodization amplitudes ...

Page 2

... Bordeaux Drive, Sunnyvale, CA 94089 2 MD2131 40 1 40-Lead QFN (K7) (top view Lot Number YY = Year Sealed MD2131 WW = Week Sealed LLLLLL A = Assembler ID YYWW AAACCC C = Country of Origin = “Green” Packaging 40-Lead QFN (K7) = 2.5V 25°C) REF A Units Conditions 70° µA Standby condition µ ...

Page 3

... V DAC = 85, ns Angle = 2.5V REF ns From and device to device ps --- ns See serial interface timing diagram % See serial interface timing diagram ns See serial interface timing diagram MHz --- dB --- ns 50% to 90% µs 50% to 10% Tel: 408-222-8888 www.supertex.com MD2131 , DD ...

Page 4

... MAX-A/B 0 (254/255)I MAX-A/B 1 (255/255)I MAX-A/B I-Vector (6-bit) Q-Vector (6-bit) COS 111111 111110 101101 000000 -101101 -111111 -101101 -000000 101101 111110 111111 2 Tel: 408-222-8888 www.supertex.com MD2131 LSB OO-A OO-A OO-A OO-A OO-A OO-A/B SIN 000000 001000 101101 111111 101101 000000 -101101 -111111 -101101 ...

Page 5

... In-Phase PWM Waveforms -40 -32 -24 - Sample Number Quadrature PWM Waveforms -40 -32 -24 - Sample Number 1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: 408-222-8888 www.supertex.com MD2131 ...

Page 6

... PA or PB, respectively. Note that the maximum full scale of pulse current port only can be ob- tained at DAC = 255 conditions. is the setting FB 1235 Bordeaux Drive, Sunnyvale, CA 94089 6 MD2131 = 2.5V 50kΩ, α = 45° and IA REF FB Tel: 408-222-8888 www.supertex.com ...

Page 7

... Bypass Cap to KA, 10nF low ESR X7R ceramic cap Notes: 1. Pin # 35 & #36 are VSUB connected to the center thermal pad internally in the package. 2. All bypass capacitors need be very close to the pins Supertex inc. 1235 Bordeaux Drive, Sunnyvale, CA 94089 7 MD2131 Tel: 408-222-8888 www.supertex.com ...

Page 8

... No responsibility is assumed for possible omissions and inaccuracies. Circuitry and specifications are subject to change without notice. For the latest product specifications refer to the ©2011 Supertex inc. All rights reserved. Unauthorized use or reproduction is prohibited. Doc.# DSFP-MD2131 A083111 θ ...

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