MD1711DB2 Supertex, MD1711DB2 Datasheet - Page 5

• Manufacturer Part Number: MD1711DB2
• Manufacturer: Supertex

Specifications of MD1711DB2

• Lead Free Status / Rohs Status: Supplier Unconfirmed

Voltage Supply Power-Up Sequence
Testing MD1711DB2 Ultrasound Pulser
Power supply voltages and current limit settings to start the
power-up sequence are listed above. Power-down is the re-
verse of the power-up sequence.
It is important to have the protective Schottky diodes on the
MD1711 and the TC6320 pulser circuit PCB on each volt-
age-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 con-
nected to the AVSS pin. While powering up a multi-voltage
rail CMOS chip, one must usually turn one of the substrate
bias voltages fi rst, in order to prevent CMOS latch-up. How-
ever, with the Schottky diodes on-board, specifi cally the D9,
D12 and D15 diodes, the MD1711 is allowed to power-on the
VCC +3.3V fi rst, to establish the CPU and FPGA, etc. and
get the digital circuit working fi rst, then power-on the AVSS/
DVSS, AVDD/DVDD and VPP/VNN, etc., with the inactive
input logic known-state.
Use a ribbon cable to connect the input logic signal con-
nector, 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 1.8V, 2.5V
or 3.3V DC.
(The package drawing(s) in this data sheet may not refl ect the most current specifi cations. For the latest package outline
information go to http://www.supertex.com/packaging.html.)
MD1711DB2
112607
1
2
3
4
5
6
VPP1/VNN1
VPP2/VNN2
VDD1
VDD2
VCC
VSS
+1.8V to +3.3V positive logic voltage for VCC and VLL
+10V positive drive voltage for DVDD1
+5.0V positive drive voltage for DVDD2
-10V negative bias voltage for DVSS and AVSS
0 to +/-100V 1st positive and negative high voltage
0 to +/-100V 2nd positive and negative high voltage
5
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 pre-
vent circuit damage due to long cable line refl ection, a prop-
er 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.
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.
MD1711DB2