Microchip MD0101 Manual de Usario

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2020 Microchip Technology Inc. DS20005916A-page 1
MD0101
Features
Up to ±100V Input Voltage Protection
Low On-Resistance, 15Ω Typical
Integrated Clamp Diodes
Fast Switching Speed
Four Electrically Isolated Channels
No External Supplies Needed
Applications
Medical Ultrasound Imaging
Non-Destructive Testing Applications
Fast Resettable Fuses
High-Side Switches
Data Acquisition
General Description
The MD0101 is a four-channel high-voltage
current-limiting protection device. It is designed to
protect a low-noise receiver from high-voltage transmit
pulses in ultrasound applications and is commonly
referred to as a T/R (transmit-and-receive) switch.
Each channel has three terminals: TX, RX, and R
GND.
The analog switch terminals are TX and RX. RX has
integrated clamping diodes to RGND to protect the
receiver against high voltages. The output voltages will
be clamped by the anti-parallel diodes to RGND at
about ±0.6V.
The MD0101 can be considered as a normally closed
switch with a typical switch resistance of 15Ω, allowing
small signals to pass. Once the voltage drop across the
switch exceeds a nominal value of ±1V, the device
turns off. In the OFF state, the MD0101 can withstand
up to ±100V across its terminals. A small amount of
current (200 µA, typically) is allowed to flow through.
The MD0101 is not limited to just ultrasound
applications. It can also be used as resettable fuses to
protect power lines, for output short-circuit protection,
and for protection of data acquisition instruments. The
MD0101 is available in an 18-lead, 5 x 5 mm DFN
package.
Package Type
18-lead DFN
(Top view)
See Table 2-1 for pin information.
1
2
3
4
5
6
7
8
9
18
17
16
15
14
13
12
11
10
NC
Rx1
RGND1
Rx2
RGND2
Rx3
RGND3
Rx4
RGND4
NC
Tx1
NC
Tx2
NC
Tx3
NC
Tx4
NC
High-Voltage Protection T/R Switch with Clamp Diodes
MD0101
DS20005916A-page 2 2020 Microchip Technology Inc.
Functional Block Diagram
Switch Control
TX RX
RGND
2020 Microchip Technology Inc. DS20005916A-page 3
MD0101
Typical Application Circuit
Transmitter
Piezo
Transducers
RX TX
Receiver
TX
RX High Voltage
Switches
+90V
-90V
T/R Switch
MD0101
Logic
Control
and
Signal
Processing
One of
128 Channels
RGND

Especificaciones del producto

Marca: Microchip
Categoría: No categorizado
Modelo: MD0101

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