HV2818/HV2918
No High-Voltage Bias, Low Harmonic Distortion,
32-Channel, High-Voltage Analog Switch
Features
• 32-channel (16 2:1 MUX) High-Voltage Analog
Switch
• Only +5V Bias Supply Required
• 3.3V and 5V CMOS Input Logic Level
• Asymmetric Switch Topology for Small Size
• 66 MHz Data Shift Clock Frequency
• Low-Parasitic Capacitance
• Low Harmonic Distortion
• DC to 50 MHz Analog Small-Signal Frequency
• 200 kHz to 50 MHz Large Signal Frequency
• -70 dB Typical Off Isolation at 5.0 MHz
• Excellent Noise Immunity
• Cascadable Serial Data Register with Latches
• Integrated Bleed Resistors on the SW Outputs
(HV2918 only)
General Description
The HV2818/HV2918 are low harmonic distortion, low
charge injection, 16 2:1 multiplexer/demultiplexer, high
-voltage analog switches without high-voltage bias
supplies. They are intended for use in applications
requiring high-voltage switching controlled by low-
voltage control signals, such as medical ultrasound
imaging, driving piezoelectric transducers and
printers.
The HV2818/HV2918 are pin-to-pin compatible to
high-voltage bias HV2801/HV2901, except for bias
voltage pins. HV2818/HV2918 are available in a 64-
pin, 9 x 9 mm QFN package. HV2818/HV2918 have
asymmetric topology to implement a small size in low
voltage bias high-voltage switches while keeping
performance such as peak current. The SW pin can
pass high-voltage pulsed signals when the switch is
ON. During the OFF state, high-voltage should not be
applied to the SW pin due to its asymmetric topology.
In medical ultrasound systems, the Y pin should be
connected to the AFE (analog front end) and the SW
pin should be connected to a single piezoelectric
transducer element to avoid high-voltage in the SW
pin during the switch OFF state.
HV2818 and HV2918 are identical, except for bleed
resistors at SW pins. HV2818 does not have the bleed
resistors at SW pins like HV2801. HV2918 has the
bleed resistors at SW pins like HV2901. The bleed
resistors eliminate possible voltage build-up on
capacitive loads such as piezoelectric transducers.
The ON/OFF state of the 32 switches is programmed
individually through a digital serial interface.
The devices only need a +5V low voltage bias supply.
However, all of the analog switches can pass up to
±100V high-voltage pulsed signals. Like other low
voltage bias switches, the HV2818/HV2918 cannot
pass high-voltage DC signals. They can only pass high
-voltage pulsed signals up to 2.5
μs
pulse width.
These devices have typical 6Ω ON resistance and
50 MHz bandwidth for small signals.
Applications
• Medical Ultrasound Imaging
• Non-Destructive Testing (NDT) Metal Flaw
Detection
• Piezoelectric Transducer Drivers
• Inkjet Printer Head
• Optical MEMS Modules
2020 Microchip Technology Inc.
DS20006375A-page 1
HV2818/HV2918
Package Type
HV2818/HV2918
9 x 9 x 0.9 mm VQFN
(TOP VIEW)
64
1
EP
*Includes Exposed Thermal Pad (EP); see
Table 2-1.
Functional Block Diagram
Latches
D
LE
CLR
D
LE
CLR
D
LE
CLR
CLK
D
LE
CLR
Level
Shifters
Output
Switches
Bleed
Resistors
SW0
Y01
SW1
SW2
Y23
D
IN
32-Bit
Shift
Register
SW3
D
OUT
D
LE
CLR
D
LE
CLR
SW30
Y3031
SW31
V
LL
DGND
LE CLR
V
DD
GND
R
GND
HV2918 has bleed resistor at SWx pins
DS20006375A-page 2
2020 Microchip Technology Inc.
HV2818/HV2918
1.0
ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings †
Logic Supply Voltage (V
LL
) .......................................................................................................................... -0.5V to 6.6V
Positive Supply Voltage (V
DD
)...................................................................................................................... -0.5V to 6.6V
Logic Input Voltage (V
IN
)......................................................................................................................-0.5V to V
LL
+0.3V
Analog Signal Voltage Y Pin (V
Y
)..............................................................................................................-110V to +110V
Analog Signal Voltage SW Pin (V
SW
) when Switch ON ............................................................................-110V to +110V
Analog Signal Voltage SW Pin (V
SW
) when Switch OFF ................................................................................. -2V to +2V
Peak Analog Signal Current/Channel (I
PK
) ................................................................................................................2.7A
† Notice:
Stresses above those listed under Maximum Ratings may cause permanent damage to the device. This is
a stress rating only and functional operation of the device at those or any other conditions above those indicated in the
operational sections of this specification is not intended. Exposure to maximum rating conditions for extended periods
may affect device reliability.
Note 1:
Devices are ESD-sensitive. Handling precautions are recommended.
RECOMMENDED OPERATING CONDITIONS
Parameters
Logic Supply Voltage
Positive Supply Voltage
Analog Signal Voltage Y Pin
Peak-to-Peak
High-Level Input Voltage
Low-Level Input Voltage
Note 1:
2:
3:
Sym.
V
LL
V
DD
V
Y
V
IH
V
IL
Min.
3
4.5
-100
0.9V
LL
0
Typ.
—
—
—
—
—
Max.
5.5
6.3
100
V
LL
0.1V
LL
Units
V
V
V
V
V
Conditions
Power up/down sequence is V
LL
first and then V
DD
. Powered-down sequence is reverse of power-up.
V
Y
and V
SW
must be within V
DD
and GND or floating during power-up/down transition.
Rise and fall times of power supplies, V
LL
and V
DD
should be greater than 1.0 ms.
DC ELECTRICAL CHARACTERISTICS
Unless otherwise specified, V
DD
=+5V, V
LL
=+5V, T
A
= 25
°C
.
Boldface
specifications apply over the full operating tem-
perature range.
Parameters
Small-Signal Switch
On-Resistance
Small Signal Switch
On-Resistance Matching
Large signal switch
ON-resistance
Value of Output Bleed Resistor
(HV2918 only)
Sym.
R
ONS
ΔR
ONS
R
ONL
R
INT
Min.
—
—
—
—
20
—
Switch Off Leakage per SW Pin
I
SOL
—
—
3
μA
Typ.
6
6
—
5
35
—
Max.
9
9
20
—
50
3
Units
Ω
Ω
%
Ω
kΩ
μA
I
SIG
= 5 mA
I
SIG
= 200 mA
I
SIG
= 5 mA,
V
SIG
= 90V, R
LOAD
= 80Ω [Note
1]
Output switch to RGND
I
RINT
= 20
μA
V
SIG
= +100V, 500
μs
pulse,
See
Figure 3-1
V
SIG
= -100V, 100μs pulse,
See
Figure 3-1
[Note
1]
Conditions
Note 1:
Specification is obtained by characterization and is not 100% tested.
2:
Design guidance only.
2020 Microchip Technology Inc.
DS20006375A-page 3
HV2818/HV2918
DC ELECTRICAL CHARACTERISTICS (CONTINUED)
Unless otherwise specified, V
DD
=+5V, V
LL
=+5V, T
A
= 25
°C
.
Boldface
specifications apply over the full operating tem-
perature range.
Parameters
Sym.
Min.
—
Switch Off Bias per Y Pin
—
I
SOB
Switch Off Bias per SW Pin
—
—
3
—
3
mA
Typ.
—
Max.
3
Units
μA
Conditions
V
SIG
= +100V, 500
μs
pulse,
See
Figure 3-2
V
SIG
= -100V, 100
μs
pulse,
See
Figure 3-2
[Note
1]
HV2818
μA
V
SIG
= +300 mV,-300 mV,
See
Figure 3-3
HV2918
Switch Off Bias of All SW Pins
DC Offset Switch Off
DC Offset Switch On
Quiescent V
DD
Supply Current
Quiescent V
LL
Supply Current
Switch Output Peak Current
Output Switching Frequency
Average V
DD
Supply Current
Average V
LL
Supply Current
Data Out Source Current
Data Out Sink Current
Logic Input Capacitance
V
OS
—
—
—
—
—
—
2
—
—
—
10
10
-
—
1
1
—
—
—
2.7
—
7
1.3
—
—
8
10
10
10
10
10
10
—
50
10
2.5
—
—
—
mV
μA
μA
μA
A
kHz
mA
mA
mA
mA
pF
μA
V
SIG
= +300 mV,-300 mV,
See
Figure 3-3
R
LOAD
= 50 kΩ (HV2818),
No load (HV2918)
See
Figure 3-4
All switches OFF
All switches ON, V
SW
= 1V
All logic inputs are static
V
SIG
duty cycle <0.1% [Note
1]
Duty cycle = 50% [Note
1]
All output switches are turning ON
and OFF at 50 kHz with no load
f
CLK
= 5.0 MHz
V
OUT
= V
LL
- 0.7V
V
OUT
= 0.7V
[Note
2]
I
DDQ
I
LLQ
I
SW
f
SW
I
DD
I
LL
I
SOR
I
SINK
C
IN
Note 1:
Specification is obtained by characterization and is not 100% tested.
2:
Design guidance only.
AC ELECTRICAL CHARACTERISTICS
Unless otherwise specified, V
DD
=+5V, V
LL
=+5V, T
AMB
= 25
°C
.
Boldface
specifications apply over the full operating
temperature range.
Parameters
Setup Time before LE Rises
Time Width of LE
Clock Delay Time to Data Out
Time Width of CLR
Sym,
t
SD
t
WLE
t
DO
t
WCLR
Min.
25
12
—
55
Typ.
—
—
—
—
Max.
—
—
13.5
—
Units.
ns
ns
[Note
1]
[Note
1]
Conditions
ns
ns
[Note
1]
Note 1:
Specification is obtained by characterization and is not 100% tested.
2:
Design guidance only.
DS20006375A-page 4
2020 Microchip Technology Inc.
HV2818/HV2918
AC ELECTRICAL CHARACTERISTICS (CONTINUED)
Unless otherwise specified, V
DD
=+5V, V
LL
=+5V, T
AMB
= 25
°C
.
Boldface
specifications apply over the full operating
temperature range.
Parameters
Setup Time Data to Clock
Hold Time Data from Clock
Clock Frequency
Clock Rise and Fall Times
Turn-On Time
Turn-Off Time
Input Large-Signal Pulse Width
Maximum V
SIG
Slew Rate
Analog Small-Signal Frequency
Sym,
t
SU
t
H
f
CLK
t
R
, t
F
t
ON
t
OFF
t
PW
dv/dt
f
BWS
Min.
1.5
1.5
—
—
—
—
—
—
—
—
Off Isolation Y to SW
—
K
O
—
Off Isolation SW to Y
—
Switch Crosstalk
Off Capacitance SW to GND
Off Capacitance Y to GND
On Capacitance SW to GND
On Capacitance Y to GND
Output Voltage Spike at SW
C
SG(ON)
+V
SPK
-V
SPK
+V
SPK
-V
SPK
QC
K
CR
C
SG(OFF)
—
—
—
—
—
—
-10
—
-10
—
—
—
Second Harmonic Distortion
HD2
—
-63
—
dBc
-70
-70
4
21
22
22
—
—
—
—
50
100
-65
-75
-60
—
—
—
—
40
—
40
—
—
—
—
pC
pC
dBc
mV
pF
mV
dB
pF
-65
-60
dB
-70
-65
Typ.
—
—
—
—
—
—
—
—
50
-65
Max.
—
—
66
50
5
5
2.5
20
—
-60
dB
Units.
ns
ns
MHz
ns
μs
V
SIG
= 5V, R
LOAD
= 550Ω
See
Figure 3-5
V
PULSE
= 0V to ±100V.
Measured at 90% amplitude.
See
Figure 3-6
[Note
1]
[1]
[1]
f = 5.0 MHz, 1.0 kΩ//15 pF load.
See
Figure 3-7
[Note
1]
f = 5.0 MHz, 50Ω load.
See
Figure 3-7
[Note
1]
f = 5.0 MHz, 1.0 kΩ//15 pF load.
See
Figure 3-8
[Note
1]
f = 5.0 MHz, 50Ω load.
See
Figure 3-8
[Note
1]
f = 5.0 MHz, 50Ω load.
See
Figure 3-9
[Note
1]
V
SIG
= 50 mV @1 MHz, no load,
both SW OFF [Note
1]
V
SIG
= 50 mV@1 MHz, no load,
one SW ON, one SW OFF
[Note
1]
R
LOAD
= 50Ω. See
Figure 3-10
[Note
1]
R
LOAD
= 50Ω. See
Figure 3-10
[Note
1]
See
Figure 3-11
[Note
1]
See
Figure 3-11
[Note
1]
V
SIG
= 1.5
V
PP
@5 MHz, 50Ω
load [Note
1]
V
SIG
= 1.5
V
PP
@5 MHz,
1 kΩ//15 pF load [Note
1]
[Note
1]
[Note
1]
50% duty cycle, f
DIN
= (1/2)f
CLK
,
C
DOUT
= 20 pF [Note
1]
Conditions
μs
V/ns
MHz
Output Voltage Spike at Y
Charge Injection at SW
Charge Injection at Y
Note 1:
Specification is obtained by characterization and is not 100% tested.
2:
Design guidance only.
2020 Microchip Technology Inc.
DS20006375A-page 5
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