Microchip HV257DB2 Manual


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Supertex inc.
Supertex inc.
www.supertex.com
HV257DB2
Doc.# DSDB-HV257DB1
B032114
General Description
The Supertex HV257DB2 is a 32-Channel, 295V, sample
and hold amplier array with a nominal gain of 72V/V. The
purpose of the HV257DB2 is to provide a means to easily
evaluate the Supertex HV257FG device. A high voltage
supply, VPP
, and four low voltage supplies, AVDD and DVDD,
AVNN and DVNN, are required. Referring to the demo board
drawing shown below, the logic and VSIG connections are
on the left, the high voltage outputs are on the bottom, and
the supplies are on the right. Please follow the power up/
down sequence to avoid damaging the device.
High Voltage Sample and Hold Amplier Array
Specications
Parameter Value
VPP
, High voltage supply: 300V
AVDD / DVDD, Low voltage positive supply 6.0 to 7.5V:
AVNN / DVNN, Low voltage negative supply -4.5 to -6.5V:
VSIG, Input signal range 0 to 5.0V:
HVOUT, Output voltage swing 0 to 295V
AV
, Closed loop gain 72V/V ±5%
SR, Output slew rate into 100pF load 2.0V/µs
Power Up/Down Sequence
The device can be damaged due to improper power up/down
sequence. To prevent damage, please follow the acceptable
power up/down sequences. Two external diodes, D1 and
D2, are added in the demo board to prevent damage dur-
ing power Up/Down. The rst diode is a high voltage diode
across VPP and AVDD. Any low current high voltage diode can
be used. The second diode can be any low voltage schottky
diode across AVNN and GND.
Acceptable Power Up Sequences
1) VPP 2) VNN 3) VDD 4) Inputs & Anode
or
1) VNN
2) VDD 3) VPP 4) Inputs & Anode
Acceptable Power Down Sequences
1) Inputs & Anode 2) VDD 3) VNN 4) VPP
or
1) Inputs & Anode 2) VPP 3) VDD 4) VNN
Inputs and Outputs
The output of the HV257FG will swing from 0 to 295V. The
internal closed loop gain is set at 72V/V. An input voltage of
4.096V will give an output of 295V. Input voltages of up to
5.0V can be applied but will cause the amplier to saturate.
When EN is high, the addressed output, determined by A0 to
A4, will be sampling the input signal VSIG. When EN is low,
all the internal sampling switches are open.
The output current source and sink for all 32 channels can
be adjusted using R1 and R2. The limit is approximately
12.5V divided by the resistor value. The demo board uses
24.9kΩ for ±500µA limiting.
Temperature Diode
The HV257FG has an integrated silicon diode to help moni-
tor the die temperature if desired. Pin 95 is the anode and
pin 96 is the cathode. Pads are available on the board for
these connections.
HV257DB2
DGND
DVDD
DVNN
AGND
No Connect
AVDD
AVNN
VPP
EN
A0
A1
A2
A3
A4
VSIG
VSGND
HVOUT0
HVOUT31
C1
C2
C3
C4
C5
D1
R3
U1
HV257
pin1
C6
C9
C7
C8
R1 R2
D2
C10
Supertex inc.
Board Layout and Connections


Produkt Specifikationer

Mærke: Microchip
Kategori: Ikke kategoriseret
Model: HV257DB2

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