Supertex inc. MD1711DB2 MD1711 + TC6320 Demoboard Five-Level, Dual Channel ±100V 2.0A RTZ Pulser Features General Description ►► Five-level, dual-channel ultrasound transmitter ►► MD1711 driving six TC6320 HV MOSFETs ►► Design for RTZ waveforms outputs ►► Low second harmonic distortion ►► Dual 0 to +/-100V peak to peak voltage supply ►► ±2.0 A source and sink current capability ►► SMA connectors for external clock and signals ►► 1.8 to 3.3V CMOS logic interface The MD1711DB2 demoboard is as a five-level, dual-channel, +/-100V, 2.0A, return-to-zero pulser. It can directly drive two 50 or 75Ω impedance transducers for 1.0MHz to 20MHz medical ultrasound imaging or NDT applications. The MD1711DB2 consists of one MD1711 in a 48-Lead LQFP package driving six TC6320 complementary high voltage MOSFET pairs in 8-Lead SOIC packages. The external logic signal connector, J13, connects all the input control signals of the MD1711 to the user’s logic control source via a short ribbon cable. In typical two-, three- or five-level bipolar pulsing, PW or CW waveforms can be generated by the proper input control signal listed below. Jumpers are provided for the output, such that it can drive either the on-board RC load 220pF capacitor in parallel with a 1.0KΩ resistor or with an external load of cable to the user’s ultrasound testing transducer. Applications ►► ►► ►► ►► ►► ►► Medical ultrasound imaging Ultrasonic NDT inspection Piezoelectric transducer drivers ATE and waveform generator PZT transducer drivers Capacitive and MEMS sensor driver Block Diagram +100V DVDD2 1.0µF 10nF DVDD1 DVDD2 DVDD2 10nF AVDD1 -100V 1.0µF +50V DVDD1 1.0µF XDCR-A 10nF DVDD1 POSA / POS1A 10nF NEGA / NEG1A -50V 1.0µF HVEN1A / POS2A HVEN2A / NEG2A CLAMPA VSS DVDD1 VLL SEL EN Control Logic and Level Translate +100V DVDD2 1.0µF 10nF DVDD2 POSB / POS1B -100V 10nF NEGB / NEG1B 1.0µF HVEN1B/ POS2B HVEN2B / NEG2B +50V DVDD1 1.0µF CLAMPB XDCR-A 10nF DVDD1 -50V 10nF 1.0µF AVSS DVSS AGND DGND VSS DVDD1 Supertex MD1711 Doc.# DSDB-MD1711DB2 B032114 Supertex TC6320 Supertex inc. www.supertex.com MD1711DB2 Demo Waveform A SEL = 1 EN POS1 NEG1 EN1A EN2A CLAMP VPP1 HVOUT VPP2 VNN2 VNN1 Demo Waveform B SEL = 0, CLAMP = 0 EN POS1 NEG1 EN1A EN2A VPP1 VPP2 HVOUT VNN2 VNN1 Demo Waveform C SEL = 1 EN POS1 NEG1 EN1A EN2A CLAMP Doc.# DSDB-MD1711DB2 B032114 VPP1 VPP2 HVOUT VNN1 VNN2 2 Supertex inc. www.supertex.com D9A J13 MH4 DVDD1 D12A +3.3V/-12V/+12V TP 11 + C33 10 16V C31 10 16V D12B D15B C43 + 10 16V (+5V) DVDD2 TP 12 TP16 TP17 D15A (+10V) DVDD1 2 4 6 8 10 12 14 16 18 20 22 24 MH1 HEADER 12X2 1 3 5 7 9 11 13 15 17 19 21 23 J10 (-10V) DVSS TP15 D9B VCC DVDD1 C10 0.22 VCC MH3 C1 0.22 FB1 C37 10µ 100V D13 B1100 -13 TP 18 TP 6 TP 7 TP 8 TP 9 TP 10 TP 1 TP 2 TP 3 TP 4 TP 5 DVDD 1 J11 POSB NEGB EN1B EN2B CLMPB POSA NEGA EN1A EN2A CLMPA EN SEL AGND AVDD1 46 +/-12 to 100 VPP1&VNN1 VPP1 C21 0.22 12 11 10 9 8 1 2 3 4 5 47 13 7 6 C11 0.22 45 1 DVS S2 C4 0.22 DVDD 2 C7 0.22 C34 1.0µ 100V D10 B1100 -13 VNN1 FB2 2 C22 0.22 C12 0.22 U1 MD1711 DVDD 11 29 17 27 20 24 22 32 44 +/-12 to 100 VPP2 & VNN2 C38 1.0µ 100V VNN2 C40 1.0µ 100V J12 41 34 DVDD 2 C25 0.22 ONB3 OPB3 ONB2 OPB2 ONB1 OPB1 ONA3 OPA3 ONA2 OPA2 37 39 D11 B1100 -13 VPP2 DVDD 1 C24 0.22 OPA1 C13 0.22 ONA1 DVDD 1 D14 B1100 -13 C23 0.22 DVSS AV SS 1 AV SS 2 AV SS 3 VL L DVSS 35 DG ND4 14 15 48 31 DVDD 13 VCC 36 DVDD 23 DVDD 24 DG ND1 DG ND2 DG ND3 18 26 30 TP19 NC2 NC1 23 DVDD 12 40 38 43 DG ND5 DVS S1 16 42 DVDD 15 28 3 19 33 DVDD 14 DVDD 21 DVDD 22 MH2 + Doc.# DSDB-MD1711DB2 B032114 21 25 C41 10n 200V C35 10n 200V C29 10n 200V C27 10n 200V C17 10n 200V C14 10n 200V C3 10n 200V C1 10n 200V 2 4 2 4 2 4 2 4 2 4 2 4 P P P P P P N TC6320 U8 N TC6320 U7 N TC6320 U6 N TC6320 U5 N TC6320 U4 N TC6320 U3 VNN2 1 8 7 5 6 3 VPP2 VNN1 1 8 7 5 6 3 VPP1 1 8 7 5 6 3 1 8 7 5 6 3 VNN2 1 8 7 5 6 3 VPP2 1 VNN1 8 7 6 5 3 VPP1 C42 1.0µ 100V C36 1.0µ 100V C32 1.0µ 100V C8 1.0µ 100V C19 1.0µ 100V C16 1.0µ 100V C5 1.0µ 100V C2 1.0µ 100V TP21 J4 J2 D8 MMBD3004BRM C30 220p 250V TP23 J4 J8 D7 MMBD3004BRM C18 220p 250V D6 MMBD3004BRM TP22 R17 1KΩ 1W R7 200Ω R7 1KΩ 1W R6 200Ω TP20 J9 XDCR-B J3 XDCR-A MD1711DB2 Schematic Diagram Supertex inc. www.supertex.com MD1711DB2 Board Layout Power Supply Voltages and Current Limit Settings Sym Parameter Min Typ Max Units Suggested Current Limit VSS Negative drive supply -12 -10 -8.0 V 10mA VDD1 Positive drive supply 8.0 10 12.6 V 50mA VDD2 Positive drive supply 4.75 5.0 12.6 V 10mA VCC Logic Supply MD1711 VLL 1.8 3.3 5.5 V 5.0mA (not including to J13-1, if any) VPP1 TC6320 HV positive supply 0 - 100 V 1.5mA VNN1 TC6320 HV negative supply -100 - 0 V 1.5mA VPP2 TC6320 HV positive supply 0 - 100 V 1.5mA VNN2 TC6320 HV negative supply -100 - 0 V 1.5mA Voltage Supply Power-Up Sequence 1 VCC +1.8V to +3.3V positive logic voltage for VCC and VLL 2 VDD1 +10V positive drive voltage for DVDD1 3 VDD2 +5.0V positive drive voltage for DVDD2 4 VSS 5 VPP1/VNN1 0 to +/-100V 1st positive and negative high voltage 6 VPP2/VNN2 0 to +/-100V 2nd positive and negative high voltage Doc.# DSDB-MD1711DB2 B032114 -10V negative bias voltage for DVSS and AVSS 4 Supertex inc. www.supertex.com MD1711DB2 Testing MD1711DB2 Ultrasound Pulser Power supply voltages and current limit settings to start the power-up sequence are listed above. Power-down is the reverse of the power-up sequence. Use a high-impendence oscilloscope probe for all on-board test points. There are two 5:1 voltage attenuators on-board (R6 and R16 are 200Ω) that are designed to connect the high voltage output J3 and J9 SMA connectors via a 50Ω coaxial cable to the oscilloscope (50Ω input) directly. If one needs to connect the J3 or J9 SMA connectors to a testing transducer with a coaxial cable of 50/75Ω, in order to prevent circuit damage due to long cable line reflection, a proper in-series resistor of 40 to 67Ω revise-termination should be considered on R6 or R16, with the impedance matching the cable and transducer load impedances. The TC6320’s output impedance is about 8.0Ω. It is important to have the protective Schottky diodes on the MD1711 and the TC6320 pulser circuit PCB on each voltage-rail, just like this demoboard. Only one set of diodes is required per board if multiple pulser channels are on the same PCB. The IC substrate of the MD1711 is internally connected to the AVSS pin. While powering up a multi-voltage rail CMOS chip, one must usually turn one of the substrate bias voltages first, in order to prevent CMOS latch-up. However, with the Schottky diodes on-board, specifically the D9, D12 and D15 diodes, the MD1711 is allowed to power-on the VCC +3.3V first, to establish the CPU and FPGA, etc. and get the digital circuit working first, then power-on the AVSS/ DVSS, AVDD/DVDD and VPP/VNN, etc., with the inactive input logic known-state. If an external cable load is used, disconnect the on-board load (220pF // 1.0KΩ) by removing both jumpers on J2 or J8 (1-3) & (2-4), then place one jumper at J2 or J8 (1-2) position. Any overloaded outputs, including shorter pulse duty cycles, longer pulse durations or higher CW voltages (>12V) could damage the IC or MOSFETs. Use a ribbon cable to connect the input logic signal connector, J13. Ground pins 3, 5-23 of J13 on the digital logic DGND of the signal generator side. Logic supply voltage VCC must equal the VLL of MD1711. It is usually 1.8, 2.5 or 3.3V DC. Supertex inc. does not recommend the use of its products in life support applications, and will not knowingly sell them for use in such applications unless it receives an adequate “product liability indemnification insurance agreement.” Supertex inc. does not assume responsibility for use of devices described, and limits its liability to the replacement of the devices determined defective due to workmanship. 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 Supertex inc. (website: http//www.supertex.com) Supertex inc. ©2014 Supertex inc. All rights reserved. Unauthorized use or reproduction is prohibited. Doc.# DSDB-MD1711DB2 B032114 5 1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: 408-222-8888 www.supertex.com