HV2221
Low Charge Injection, 8-Channel,
Unipolar, Negative High Voltage, Analog Switch
Features
►
►
►
►
►
►
►
►
►
►
►
►
Low on-resistance, 14
Ω
max.
HVCMOS technology for high performance
3.3 or 5.0V CMOS input logic level
20MHz data shift clock frequency
Very low quiescent power dissipation - 10µA
Low parasitic capacitance
DC to 10MHz analog signal frequency
-60dB typical off-isolation at 5MHz
CMOS logic circuitry for low power
Excellent noise immunity
Cascadable serial data register with latches
Flexible operating supply voltages
General Description
The Supertex HV2221 is a low charge injection, 8-channel, unipolar,
negative high voltage, analog switch integrated circuit (IC) intended
for use in applications requiring high voltage switching controlled
by low voltage control signals, such as NDT ultrasound flaw
detection, medical ultrasound imaging, piezoelectric transducer
drivers, and printers.
Data is input into an 8-bit shift register that can then be retained
in an 8-bit latch. To reduce any possible clock feed-through noise,
the latch enable bar should be left high until all bits are clocked in.
Data is clocked in during the rising edge of the clock.
Using HVCMOS technology, this device combines high voltage
bilateral DMOS switches and low power CMOS logic to provide
efficient control of high voltage analog signals.
Applications
►
►
►
►
►
NDT metal flaw detection
Medical ultrasound imaging
Piezoelectric transducer drivers
Inkjet printer heads
Optical MEMS modules
Block Diagram
LATCHES
D
LE
CLR
LEVEL
SHIFTERS
OUTPUT
SWITCHES
SW0
CLK
D
LE
CLR
SW1
DIN
8-BIT
SHIFT
REGISTER
D
LE
CLR
SW2
DOUT
D
LE
CLR
SW6
D
LE
CLR
SW7
VDD GND
LE
CLR
VNN VPP
SUPERTEX [ Supertex, Inc ]
