HV256
32-Channel High Voltage
Amplifier Array
Features
►
►
►
►
►
►
►
►
►
32 independent high voltage amplifiers
300V operating voltage
295V output voltage
2.2V/µs typical output slew rate
Adjustable output current source limit
Adjustable output current sink limit
Internal closed loop gain of 72V/V
12MΩ feedback impedance
Layout ideal for die applications
General Description
The Supertex HV256 is a 32-channel, high voltage, amplifier
array integrated circuit. It operates on a single high voltage
supply, up to 300V, and two low voltage supplies, V
DD
and V
NN
.
The input voltage range is from 0 to 4.096V. The internal closed
loop gain is 72V/V, giving an output voltage of 295V when
4.096V is applied. Input voltages of up to 5.0V can be applied,
but will cause the output to saturate. The maximum output
voltage swing is 5.0V below the V
PP
high voltage supply. The
outputs can drive capacitive loads of up to 3000pF.
The maximum output source and sink current can be adjusted
by using two external resistors. An external R
SOURCE
resistor
controls the maximum sourcing current and an external R
SINK
resistor controls the maximum sinking current. The current
limit is approximately 12.5V divided by the external resistor
value. The setting is common for all 32 outputs. A low voltage
silicon junction diode is made available to help monitor the die
temperature.
Applications
►
MEMS (microelectromechanical systems) driver
►
Piezoelectric transducer driver
►
Optical crosspoint switches (using MEMS
technology)
Typical Application Circuit
Micro
Processor
DAC
DAC
DAC
DAC
HV256
V
IN
0
VDD
VPP
HV
OUT
0
HV
OUT
1
y
x
y
x
V
IN
1
V
IN
2
V
IN
3
HV
OUT
2
High Voltage
Op-Amp
Array
HV
OUT
3
MEMS
Array
DAC
V
IN
30
V
IN
31
R
SOURCE
R
SINK
DAC
HV
OUT
30
HV
OUT
31
AGND
VNN
●
1235 Bordeaux Drive, Sunnyvale, CA 94089
●
Tel: 408-222-8888
●
www.supertex.com
HV256
Ordering Information
Device
HV256
20.00x14.00mm body
3.15mm height (max)
0.65mm pitch
3.20mm footprint
Pin Configuration
80
51
50
81
100-Lead MQFP
HV256FG-G
-G indicates package is RoHS compliant (‘Green’)
100
1
31
100-Lead MQFP (FG)
30
100-Lead MQFP
(top view)
(top view)
Absolute Maximum Ratings
Parameter
V
PP
, High voltage supply
AV
DD
, Analog low voltage positive supply
DV
DD
, Digital low voltage positive supply
AV
NN
, Analog low voltage negative supply
DV
NN
, Digital low voltage negative supply
Logic input voltage
V
SIG
, Analog input signal
Storage temperature range
Maximum junction temperature
Value
310V
8.0V
8.0V
-7.0V
-7.0V
-0.5V to DV
DD
0V to 6.0V
-65°C to 150°C
150°C
Product Marking
Top Marking
HV 256F G
LLLLLLLLLL
Y YW W
CCCCCCCC AAA
YY = Year Sealed
WW = Week Sealed
L = Lot Number
C = Country of Origin
A = Assembler ID
= “Green” Packaging
100-Lead MQFP (FG)
Absolute Maximum Ratings are those values beyond which damage to the
device may occur. Functional operation under these conditions is not implied.
Continuous operation of the device at the absolute rating level may affect
device reliability. All voltages are referenced to device ground.
Operating Conditions
Sym
V
PP
V
DD
V
NN
I
PP
I
DD
I
NN
T
J
Parameter
High voltage positive supply
Low voltage positive supply
Low voltage negative supply
V
PP
supply current
V
DD
supply current
V
NN
supply current
Operating temperature range
Min
125
6.0
-4.5
-
-
-6.0
-10
Typ
-
-
-
-
-
-
-
Max
300
7.5
-6.5
0.8
5.0
-
85
Units
V
V
V
mA
mA
mA
°C
Conditions
---
---
---
V
PP
= 300V, All HV
OUT
= 0V No load
V
DD
= 6.0V to 7.5V
V
NN
= -4.5V to -6.5V
---
●
1235 Bordeaux Drive, Sunnyvale, CA 94089
●
Tel: 408-222-8888
●
www.supertex.com
2
HV256
Electrical Characteristics
(over operating conditions, unless otherwise specified
Sym
HV
OUT
V
IN
V
INOS
SR
BW
A
O
A
V
R
FB
C
LOAD
I
SOURCE
I
SINK
R
SOURCE
R
SINK
CT
DC
PSRR
Parameter
HV
OUT
voltage swing
Input voltage range
Input voltage offset
HV
OUT
slew rate rise
HV
OUT
slew rate fall
HV
OUT
-3dB channel bandwidth
Open loop gain
Closed loop gain
Feedback resistance from HV
OUT
to ground
HV
OUT
capacitive load
HV
OUT
sourcing current limiting range
HV
OUT
sinking current limiting range
External resistance range for setting
maximum current source
External resistance range for setting
maximum current sink
DC channel to channel crosstalk
Power supply rejection ratio for V
PP
, V
DD
, V
NN
Parameter
Peak inverse voltage
Forward diode drop
Forward diode current
V
F
temperature coefficient
Min
0
0
-
-
-
-
70
68.4
9.6
0
385
385
25
25
-80
-40
Typ
-
-
-
2.2
2.0
4.0
100
72
12
-
550
550
-
-
-
-
Max
V
PP
-5.0
5.0
±50
-
-
-
-
75.6
-
3000
715
715
250
250
-
-
Units
V
V
mV
V/µs
V/µs
KHz
dB
V/V
MΩ
pF
µA
µA
KΩ
KΩ
dB
dB
Conditions
---
---
Input referred
No load
No load
V
PP
= 300V
---
---
---
---
R
SOURCE
= 25KΩ
R
SINK
= 25KΩ
---
---
---
---
Temperature Diode
Sym
PIV
V
F
I
F
T
C
Min
-
-
-
-
Typ
-
0.6
-
-2.2
Max
5.0
-
100
-
Units
V
V
µA
mV/°C
Conditions
cathode to anode
I
F
= 100µA, anode to
cathode at T
A
= 25°C
anode to cathode
anode to cathode
●
1235 Bordeaux Drive, Sunnyvale, CA 94089
●
Tel: 408-222-8888
●
www.supertex.com
3
HV256
HV256 Block Diagram
BYP-VPP
BYP-VDD
BYP-VNN
To internal VPP bus
To internal VDD bus
To internal VNN bus
RSOURCE
Output Current Source
Limiting for all HVOUT
Output Current Sink
Limiting for all HVOUT
RSINK
VPP
VDD
VDD
VPP
VDD
VPP
GND
VNN
Anode
Cathode
●
1235 Bordeaux Drive, Sunnyvale, CA 94089
●
Tel: 408-222-8888
●
www.supertex.com
4
+
V
IN
31
+
V
IN
1
+
V
IN
0
HV
OUT
0
VNN
-
-
-
71R
R
HV
OUT
1
VNN
71R
R
HV
OUT
31
71R
R
HV256
Power Up/Down Issues
External Diode Protection
The device can be damaged due to improper power up / down
sequence. To prevent damage, please follow the acceptable power
up / down sequences, and add two external diodes as shown in
the diagram on the right. The first diode is a high voltage diode
across VPP and VDD, where the anode of the diode is connected
to VDD and the cathode of the diode is connected to VPP. Any low
current, high voltage diode, such as a 1N4004, will be adequate.
The second diode is a Schottky diode across VNN and DGND,
where the anode of the Schottky diode is connected to VNN, and
the cathode is connected to DGND. Any low current Schottky diode
such as a 1N5817 will be adequate.
External Diode Protection Connection
VDD
1N4004 or similar
VPP
DGND
1N5817 or similar
VNN
Acceptable Power Up Sequences
The HV256 can be powered up with any of the following sequences
listed below.
1) VPP 2) VNN 3) VDD 4) Inputs and Anode
1) VNN 2) VDD 3) VPP 4) Inputs and Anode
1) VDD & VNN 2) Inputs 3) VPP 4) Anode
The HV256 needs all power supplies to be fully up and all channels
refreshed with V
SIG
= 0V to force all high voltage outputs to 0V.
Before that time, the high voltage outputs may have temporary
voltage excursions above or below GND level depending on
selected power up sequence. To minimize the excursions:
1. The VDD and VNN power supplies should be applied at the
same time (or within a few nanoseconds).
Suggested VPP ramp up speed should be 10msec or longer and
ramp down to be 1msec or longer.
Suggested Power Up/Down Sequence
Acceptable Power Down Sequences
The HV256 can be powered down with any of the following
sequences listed below.
1) Inputs and Anode 2) VDD 3) VNN 4) VPP
1) Inputs and Anode 2) VPP 3) VDD 4) VNN
1) Anode 2) VPP 3) Inputs 4) VNN & VDD
Recommended Power Up/Down Timing
300V
VPP
VDD
VNN
VIN
HVOUT
Gnd +/- V offset X 72
0V
6.5V
0V
0V
-5.5V
0V
0V
HV
OUT
Level at Power Up
VPP
VDD
VNN
Power Up Sequence
VNN Before VDD
0V
VDD Before VNN
VPP
VDD
VNN
HVOUT
0V
6.5V
0V
0V
-5.5V
6.5V
0V
0V
-5.5V
HVOUT
0V
-5.5V
6.5V
0V
●
1235 Bordeaux Drive, Sunnyvale, CA 94089
●
Tel: 408-222-8888
●
www.supertex.com
5
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