MD1821 Supertex, Inc., MD1821 Datasheet

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MD1821

Manufacturer Part Number
MD1821
Description
High Speed, Four Channel Mosfet Driver With Inverting Outputs
Manufacturer
Supertex, Inc.
Datasheet
Features
Applications
Typical Application Circuit
Supertex inc.
Inverting MOSFET driver
6.0ns rise and fall time
2.0A peak output source/sink current
1.8 to 5.0V input CMOS compatible
5.0 to 10V total supply voltage
Smart logic threshold
Low jitter design
Four matched channels
Drives two P- and two N-channel MOSFETs
Outputs can swing below ground
Low inductance, quad flat no-lead package
High performance, thermally enhanced
packaging
Medical ultrasound imaging
Piezoelectric transducer drivers
Nondestructive evaluation
PIN diode driver
CCD Clock driver/buffer
High speed level translator
High Speed, Four Channel MOSFET Driver with Inverting
Supertex inc.
Logic Inputs
3.3V CMOS
#1
#2
+PLS1
+PLS2
ENAB
-PLS1
-PLS2
0.22µF
1235 Bordeaux Drive, Sunnyvale, CA 94089
PE
INA
INB
INC
IND
+10V
GND
VDD
Supertex
MD1821
VSS
General Description
The Supertex MD1821 is a high speed, four channel MOSFET driver
designed to drive high voltage P- and N-channel MOSFETs for medical
ultrasound applications and other applications requiring a high output
current for a capacitive load. The high-speed input stage of the MD1821
can operate from a 1.8 to 5.0V logic interface with an optimum operating
input signal range of 1.8 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.
The output stage of the MD1821 has separate power connections
enabling the output signal L and H levels to be chosen independently
from the supply voltages used for the majority of the circuit. As an
example, the input logic levels may be 0 and 1.8V, the control logic
may be powered by +5.0 and -5.0V, and the output L and H levels may
be varied anywhere over the range of -5.0 to +5.0V. The output stage
is capable of peak currents of up to ±2.0A, depending on the supply
voltages used and load capacitance present. The PE pin serves a dual
purpose. First, its logic H level is used to compute the threshold voltage
level for the channel input level translators. Second, when PE is low, the
outputs are disabled, with the A & C output high and the B & D output
low. This assists in properly precharging the AC coupling capacitors
that may be used in series in the gate drive circuit of an external PMOS
and NMOS transistor pair.
Outputs
VH
VL
OUTC
OUTD
OUTA
OUTB
+10V
0.47µF
10nF
10nF
10nF
10nF
Supertex
Supertex
TC6320
TC6320
Tel: 408-222-8888
+100V
-100V
+100V
-100V
1.0µF
1.0µF
1.0µF
1.0µF
To
Piezoelectric
Transducer #1
To
Piezoelectric
Transducer #2
www.supertex.com
MD1821

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MD1821 Summary of contents

Page 1

... P- and N-channel MOSFETs for medical ultrasound applications and other applications requiring a high output current for a capacitive load. The high-speed input stage of the MD1821 can operate from a 1.8 to 5.0V logic interface with an optimum operating input signal range of 1.8 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 ...

Page 2

... DD -4.0 V --- DD - µA No input transitions µ input transitions µ One channel on at 5.0Mhz, No load - 0.3 V For logic inputs INA, INB, INC, and IND 1.0 µA 1.0 µA 5.25 V 0.3 V For logic input PE - KΩ ● Tel: 408-222-8888 ● www.supertex.com MD1821 ...

Page 3

... C O Output OUTA OUTC ● Tel: 408-222-8888 ● www.supertex.com MD1821 OUTB OUTD ...

Page 4

... VDD Level INB Shifter VSS VDD Level INC Shifter VSS VDD Level IND Shifter SUB GND VSS ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 4 OUTA OUTB OUTC OUTD VL VH OUT OUTB VL VH OUTC VL VH OUTD VL ● Tel: 408-222-8888 ● www.supertex.com MD1821 ...

Page 5

... GND to PE, where PE is 1.8 to 5.0V. Good trace practices should be followed corresponding to the desired operating speed. The internal circuitry of the MD1821 is capable of operating up to 100MHz, with the primary speed limitation being the loading effects of the load capacitance. Because of this speed and the high transient currents that result with capacitive loads, the bypass capacitors should be as close to the chip pins as possible ...

Page 6

... Pin Description MD1821 Delay vs Temperature PLH PHL 4 3 -50 0 Temperature ( MD1821 Delay PLH 6 t PHL Voltage (V) DD Pin Description Pin # Function 1 INB 2 VDD 3 VSS 4 INC 5 IND 6 GND OUTC 9 OUTD 10 ...

Page 7

... 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 ©2010 Supertex inc. All rights reserved. Unauthorized use or reproduction is prohibited. Doc.# DSFP-MD1821 A110110 e Note 1 (Index Area ...

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