Microchip Technology

MD0100 is a high voltage, two terminal, bi-directional, current-limiting protection device. The two terminals are interchangeable. It is designed to protect a low noise receiver from the high voltage transmit pulses in ultrasound applications and is commonly referred to as a T/R (transmit and receive) switch. The MD0100 can be considered as a normally closed switch with a typical switching resistance of 15O that allows small signals to pass. Once the voltage drop across the two terminals exceeds a nominal value of ±2.0V, the device will start to turn off. In the off state, the MD0100 can withstand up to ±100V across its terminals. A small amount of current, typical of 200µA, is allowed to flow through. The applications for the MD0100 are not limited to just ultrasound. It can also be used for resettable fuses to protect power lines, output short circuit protection, and data acquisition. The MD0100 is available in the SOT-89 package as a single channel device for ease of assembly. It is also available in a 4.0x4.0mm 8-Lead DFN package as a two channel device for high density requirements.

MD0105 is a high voltage current limiting protection device. It is designed to protect a low noise receiver from the high voltage transmit pulses in ultrasound applications and is commonly referred to as a T/R (transmit and receive) switch. The MD0105 can be considered as a normally closed switch with a typical switch resistance of 15O, allowing small signals to pass. Once the voltage drop across the two terminals exceeds a nominal value of ±2.0V, the device will start to turn off. In the off state, the MD0105 can withstand up to ±130V across its terminals. A small amount of current, typically 200µA, is allowed to flow through. The MD0105 is not limited to just ultrasound applications. It can also be used for resettable fuses to protect power lines, output short circuit protection, and data acquisition. The MD0105 is available in an 18-Lead 5x5mm DFN package as a four-channel device.

MD1210 is a high speed, dual MOSFET driver. It is designed to drive high voltage P and N-channel MOSFET transistors for medical ultrasound and other applications requiring a high output current for a capacitive load. The high-speed input stage of the MD1210 can operate from 1.2V to 5.0V logic interface with an optimum operating input signal range of 1.8V to 3.3V. An adaptive threshold circuit is used to set the level translator switch threshold to the average of the input logic 0 and logic 1 levels. The input logic levels may be ground referenced, even though the driver is putting out bipolar signals. The level translator uses a proprietary circuit, which provides DC coupling together with high-speed operation. VDD1, VDD2, and VH should be connected to the positive supply voltage, and VSS1, VSS2, and VL should be connected to 0V or to Ground. The GND pin is the logic control input signal digital ground. The output stage is capable of peak currents of up to ±2.0A, depending on the supply voltages used and load capacitance present. The OE pin serves a dual purpose. First, its logic H level is used to compute the threshold voltage level for the channel input level translators. Secondly, when OE is low, the outputs are disabled, with the A output high and the B output low. This assists in properly pre-charging the AC coupling capacitors that may be used in series in the gate drive circuit of an external PMOS and NMOS transistor pair.

MD1211 is a high speed dual MOSFET driver. It is designed to drive high voltage N and P-channel MOSFET transistors for medical ultrasound and other applications requiring a high output current for a capacitive load. The high-speed input stage of the MD1211 can operate from 1.8 to 5.0V logic interface with an optimum operating input signal range of 1.8 to 3.3V. The level translator uses a proprietary circuit, which provides DC coupling together with high-speed operation.

MD1711 is an IC for a two-channel, 5-level, high voltage and high speed transmitter driver. It is designed for medical ultrasound imaging applications, but can also be used for metal flaw detection, Non-Destructive Testing (NDT), and for driving piezoelectric transducers. The MD1711 is a two-channel logic controller circuit with low impedance MOSFET gate drivers. There are two sets of control logic inputs, one for channel A and one for channel B. Each channel consists of three pairs of MOSFET gate drivers. These drivers are designed to match the drive requirements of TC6320. The MD1711 drives six TC6320s. Each pair consists of an N-channel and a P-channel MOSFET. They are designed to have the same impedance and can provide peak currents of over 2.0amps.

MD1712 is a two-channel, five-level, high voltage and high speed transmitter driver IC. It is designed for medical ultrasound imaging applications, but can also be used for metal flaw detection, Non-Destructive Testing (NDT), and for driving piezoelectric transducers. The MD1712 is a two-channel logic controller circuit with low impedance MOSFET gate drivers. There are two sets of control logic inputs, one for channel A and one for channel B. Each channel consists of three pairs of MOSFET gate drivers. These drivers are designed to match the drive requirements of TC6320. The MD1712 drives six TC6320s. Each pair consists of an N-channel and a P-channel MOSFET. They are designed to have the same impedance and can provide peak currents of over 2.0amps.

MD1715, paired with TC8020, forms a two channel, five level, high voltage, high speed transmit pulser chip set. The chip set is designed for medical ultrasound imaging applications, but can also be used for metal flaw detection, Non-Destructive Testing (NDT), and piezoelectric transducer drivers. The MD1715 is a two channel logic controller circuit with 12 low impedance MOSFET gate drivers. There are two sets of control logic inputs, one each for channels A and B. Each channel consists of three pairs of MOSFET gate drivers. These drivers are designed to match the drive requirements of TC8020. The TC8020 is the output stage of the pulser, with six pairs of MOSFETs. Each pair consists of a P-channel and an N-channel MOSFET. They are designed to have the same impedance and can provide typical peak currents of ±3.5A at 200V.

The MD1730 is an 8-channel ultra-low phase noise CW transmitter with integrated beamformer. It is designed for medical ultrasound imaging systems requiring high-performance CW Doppler mode. The MD1730 has a dedicated signal path designed to minimize phase noise to the output. In addition, it has a high-speed SPI interface that enables CW beamforming features. The outputs of the MD1730 can swing up to ±8V and each output has a separate programmable phase delay. Additionally, by programming the internal frequency divider register, the MD1730 can output different CW frequencies from a single clock source. For instance, when the input clock frequency is 160 MHz and the frequency divider is set to 16, an output CW frequency of 5 MHz can be obtained with a phase delay step size of 6.25 ns, which translates to an angular resolution of 11.25 degrees.