HV220/HV20220/HV20320
Low Charge Injection
8-Channel High Voltage Analog Switches
Features
HVCMOS
®
technology for high performance
Very low quiescent power dissipation – 10µA
Output on-resistance typically 22 ohms
Low parasitic capacitances
DC to 10MHz analog signal frequency
-60dB typical output off isolation at 5MHz
CMOS logic circuitry for low power
Excellent noise immunity
On-chip shift register, latch and clear logic circuitry
Flexible high voltage supplies
General Description
These devices are low charge injection 8-channel high-voltage
analog switch integrated circuits (ICs) intended for use in
applications requiring high voltage switching controlled by low
voltage control signals, such as ultrasound imaging and print-
ers. Input data is shifted into an 8-bit shift register which can
then be retained in an 8-bit latch. To reduce any possible clock
feed-through noise, Latch Enable Bar (LE) should be left high
until all bits are clocked in. Using HVCMOS technology, these
switches combine high voltage bilateral DMOS switches and
low power CMOS logic to provide efficient control of high voltage
analog signals.
These ICs are suitable for various combinations of high voltage
supplies, e.g., V
PP
/V
NN
: +50V/–150V, or +100V/–100V.B
Applications
Medical ultrasound imaging
Piezoelectric transducer drivers
Block Diagram
D
IN
LATCHES
D
LE
CL
LEVEL
SHIFTERS
OUTPUT
SWITCHES
SW0
D
LE
CL
CLK
D
LE
CL
SW1
SW2
8-Bit
Shift
Register
D
LE
CL
SW3
D
LE
CL
SW4
D
LE
CL
SW5
D
OUT
D
LE
CL
SW6
D
LE
CL
SW7
V
DD
LE
CL
V
NN
V
PP
SUPERTEX [ Supertex, Inc ]
