an9505

No. AN9505
Application Note
March 1995
USING THE HI7190 EVALUATION KIT
Authors: David Jarman and John Kornblum
Evaluation Kit Description
Layout and Power Supplies
The HI7190 evaluation kit (evaluation board and evaluation
software) can be used to evaluate the performance of the
HI7190 24-bit sigma delta analog-to-digital converter (ADC).
The evaluation board includes a reference circuit, a crystal,
an oscillator, and digital circuitry used to interface to a personal computer running the evaluation software. The board
also provides a means for the user to supply an external reference and an external clock.
The HI7190 evaluation board consists of 4 layers laid out to
optimize performance of the ADC. The figures at the end of
this document include the various layers of the board and
their layout, a list of the board components, and schematics.
Users should feel free to copy this layout for use in their
applications.
The power supplies are provided to the board via the edge
connector located at the top of the board. It is recommended
that twisted pair wires be used to connect the power supplies to the connector and that analog and digital grounds be
tied together back at the power supplies. The separate supplies are necessary to keep the digital noise from coupling
into the analog portions of the circuit. One of the internal layers of the board is the ground plane layer. This layer is
roughly divided in half with one half of the layer being digital
ground and the other half being analog ground. The other
internal layer is the power plane. It is divided into three sections; AVDD, AVSS, and DVDD. Nominal values for the supplies are AVDD = +5V, AVSS = -5V, and DVDD = +5V. In some
cases (for instance if there is a substantial offset between
AGND and DGND) it may be necessary to tie the two
grounds together on the board. Resistors R2, R8, and R9
provide a means of connecting the two ground planes
together through a low impedance.
HI7190 Description
The HI7190 is a 24-bit sigma delta ADC intended for use in
applications such as industrial weight scales, process controls, and process measurement systems. The block diagram shows that the device consists of a programmable gain
instrumentation amplifier (PGIA), a second order sigma delta
modulator, a digital filter, a clock generator, and digital control and interface circuitry.
The input signal applied to the VINHI and VINLO pins comes
into the PGIA where it is gained up by a factor of 1 to 8. The
resulting signal is then passed into the oversampling second
order sigma delta modulator for A/D conversion and noise
shaping. The output of the modulator is a serial bit stream of
“1”s and “0”s whose code density is a direct indication of the
value of the input to the modulator. This bit stream is then
input to the digital filter where it is band limited and decimated down to a lower frequency. The digital filter is also
used (along with the PGIA) to implement gains up to 128.
The clock generator and digital control circuits direct the
internal conversion process while the serial interface unit
provides access to the device from the outside world. For a
detailed description of the operation of the converter, please
refer to the HI7190 data sheet.
A prototype area is provided on the left side of the board.
This area has a small section of analog ground plane in the
center and may be useful for input signal conditioning before
the HI7190.
Reference Circuit
The reference inputs of the HI7190, VRHI and VRLO, provide
a differential reference input capability. The reference inputs
provide a high impedance dynamic load similar to the analog
inputs. For proper circuit operation these pins must be driven
by low impedance circuitry. Reference noise outside of the
band of interest will be removed by the on chip digital filter
but excessive reference noise inside the band of interest will
degrade performance of the HI7190.
Hardware Description
The HI7190 evaluation board provides the user with a very simple way of interfacing to and evaluating the Intersil HI7190
sigma delta ADC. The board features a reference voltage generator, a crystal oscillator, and digital line drivers and receivers
for interfacing to a PC running the evaluation software. The
board consists of 4 layers with separate analog and digital
ground planes for obtaining optimum noise performance.
Copyright
The actual reference voltage is given by VREF = VRHI - VRLO.
The VRLO pin is hard wired to analog ground on the evaluation board which means that VREF = VRHI. The nominal reference voltage for the HI7190 is 2.5V. Larger values of VREF
© Intersil Corporation 1995
1
Application Note 9505
HI7190 Functional Block Diagram
VRHI
AVDD
VRLO
REFERENCE
INPUTS
TRANSDUCER
BURN-OUT
CURRENT
(100nA)
∑−∆
MODULATOR
PGIA
VINHI
∑
VINLO
∫
∫
∑
DIGITAL FILTER
1
1-BIT
D/A
VCM
CONTROL AND SERIAL INTERFACE UNIT
SERIAL INTERFACE
UNIT
CONTROL REGISTER
CLOCK
GENERATOR
OSC1
OSC2
DRDY RESET SYNC
CS
MODE
SCLK
SDIO
HI7190 Evaluation Board Block Diagram
CRYSTAL
OSCILLATOR
EXTERNAL
CLOCK
AIN+
CRYSTAL
AIN-
VINHI
OSC1
VINLO
OSC2
ON BOARD
REFERENCE
DIGITAL
I/O
VRHI
EXTERNAL
VREF
VRLO
VCM
AGND
DGND
HI7190
2
LINE
DRIVERS
AND
RECEIVERS
TO
PC
SDO
Application Note 9505
J1 must be removed from the board when using an external
clocking source and the external clocking source must be
disconnected from the board when using either of the on
board clocking methods. When J1 is in the right most position the 10MHz crystal oscillator is selected and when J1 is
in the left most position the combination 10MHz crystal and
on chip oscillator clocking method is selected. The external
clock can be used from a minimum frequency of 1MHz up to
a maximum frequency of 10MHz.
can be used without degradation in performance. Smaller
values of VREF can also be used but performance will be
degraded since the system noise becomes larger relative to
the LSB size.
The jumper JP2 controls whether the VRHI pin of the HI7190
is connected to an external reference, which connects to the
VREF SMA pad, or to the on board reference which is preset
to 2.5V. If JP2 is in the far right position VRHI is connected to
the on board low noise reference and when JP2 is in the far
left position VRHI is connected to the external reference. If an
external reference is used it is recommended that a twisted
pair wire be used and soldered directly to the SMA pad on
the evaluation board. The potentiometer R1 can be used to
vary the on board reference voltage. Please note that the
specifications for the HI7190 are tested with VRHI set to
2.5V. VRHI must always be greater than VRLO for proper
operation of the device.
For the best noise performance the crystal should be
removed from the board when using the crystal oscillator
and vice versa. Both the crystal and crystal oscillator should
be removed when using an external clock.
Digital Inputs/Outputs
The digital input and output pins of the HI7190 are interfaced
through line drivers and receivers to the 25 pin D connector at
the right edge of the board. These pins are activated and deactivated by the evaluation software which controls the functionality of the HI7190. Please refer the HI7190 data sheet for a
detailed description of the functionality of these pins.
Analog Inputs
The analog input on the HI7190 is a fully differential input with
programmable gain capabilities. The input accepts both unipolar and bipolar input signals and gains range from 1 to 128.
The user must pay careful attention to the input driver and/or
input filter circuitry as the input sampling rate (or modulator
clock rate) varies with the selected PGIA gain, and the input
impedance is dependent upon the modulator clock rate.
Please refer to the data sheet for more information.
U5 on the evaluation board is an “open socket” which is
used in conjunction with the test modes of the HI7190 for
Intersil internal testing and evaluation.
Software Description
The software provided with the HI7190 evaluation kit allows
the user to operate the device in many of the various modes
the part supports. The software is menu driven for ease of
use. The simplified flow diagram shown in Figure 1 gives a
good feel for the structure of the software. Every menu
allows access to all other menus.
The analog inputs come onto the board via the SMA pads
labeled AIN+ and AIN-. Once again it is recommended that
twisted pair wire be used to drive the positive and negative
analog inputs.
Common Mode Input
The jumper JP1 is provided to allow the VCM pin to be tied to
either analog ground (upper position), or VRHI (lower position). The input voltage for VCM should always be set at the
midpoint between AVDD and AVSS. So if AVDD = +5V and
AVSS = -5V, VCM should be at analog ground. Please note
the HI7190 is specified for AVDD = +5V and AVSS = -5V operation only.
MAIN MENU
READ
MENU
CHANGE MODE
MENU
RESET
DUT
Clock Input
The master clock into the HI7190 can be supplied by either a
crystal connected between the OSC1 and OSC2 pins or a
CMOS compatible clock signal connected to the OSC1 pin.
The input sampling frequency, modulator clock frequency, filter -3dB frequency, output update rate, and calibration times
are all directly related to the master clock frequency, fOSC.
For example, if a 1MHz clock is used instead of a 10MHz
clock, what is normally a 10Hz conversion rate becomes a
1Hz conversion rate. Lowering the clock frequency will also
lower the power supply currents. Please note that the
HI7190 specifications are written for a 10MHz clock only.
WRITE
MENU
EXIT
PROGRAM
FIGURE 1. SIMPLIFIED SOFTWARE FLOW CHART
The Main Menu appears after invoking the HI7190 evaluation software. This menu is the gateway to other menus that
allow the user to communicate with the HI7190.
Main Menu:
s
Reset DUT
c
Change Mode Menu
w Write Menu
The HI7190 evaluation board allows for the HI7190 master
clock to be supplied externally, generated by the on board
crystal oscillator, or generated by an on board crystal used in
conjunction with the on chip oscillator circuitry. The jumper
3
r
Read Menu
x
Exit
Application Note 9505
s
Entering s from the Main Menu sends an active low reset
signal to the HI7190 which initializes the HI7190.
c
Entering c from the Main Menu brings the Change Mode
Menu up. The Change Mode Menu allows the user to
custom configure the HI7190 without having to know the
bit positions of the Control Register.
w Entering w from the Main Menu brings the Write Menu
up. The Write Menu allows the user write access to all
writable registers without having knowledge of specific
Instruction Register address details.
r
Entering r from the Main Menu brings the Read Menu up.
The Read Menu allows the user to read all registers
without having knowledge of specific Instruction Register
address details.
x
Entering x from the Main Menu exits the program.
Change Mode Menu:
5
Entering 5 from the Change Mode Menu initiates a communication cycle with the HI7190 that invokes the System Negative Full Scale Calibration Mode with a notch
frequency of 10Hz. Other operating parameters are offset binary coding, bipolar mode and a gain of one.
Please note, the user should apply the negative full scale
voltage to the HI7190 inputs before issuing this command. Executing this command returns the user to the
Main Menu.
c
Entering c from the Change Mode Menu allows the user
to customize the operational parameters of the HI7190.
The user will be asked a series of questions relating to
HI7190 operation. After completing these questions, the
software compiles the proper data and writes the Control
Register to invoke the desired operating mode. Executing this command returns the user to the Main Menu.
r
Entering r from the Change Mode Menu invokes the
Read Menu.
1
Self Calibration - 10Hz
2
Self Calibration - 2kHz
3
System Offset Calibration - 10Hz
4
System Positive Full Scale Calibration - 10Hz
m Entering m from the Change Mode Menu invokes the
Main Menu.
5
System Negative Full Scale Calibration - 10Hz
x
c
Custom Menu
r
Read Menu
w Entering w from the Change Mode Menu invokes the
Write Menu.
Write Menu:
w Write Menu
m Main Menu
x
Exit Program
1
Entering 1 from the Change Mode Menu initiates a communication cycle with the HI7190 that invokes the Self
Calibration Mode with a notch frequency of 10Hz. Other
operating parameters are offset binary coding, bipolar
mode and a gain of one. Executing this command
returns the user to the Main Menu.
2
Entering 2 from the Change Mode Menu initiates a communication cycle with the HI7190 that invokes the Self
Calibration Mode with a notch frequency of 2kHz. Other
operating parameters are offset binary coding, bipolar
mode and a gain of one. Executing this command
returns the user to the Main Menu.
3
Entering 3 from the Change Mode Menu initiates a communication cycle with the HI7190 that invokes the System Offset Calibration Mode with a notch frequency of
10Hz. Other operating parameters are offset binary coding, bipolar mode and a gain of one. Please note, the
user should apply 0V to the HI7190 inputs before issuing
this command. Executing this command returns the user
to the Main Menu.
4
Entering x from the Change Mode Menu exits the program.
1
Command Register
2
Offset Register
3
Positive Full Scale Register
4
Negative Full Scale Register
m Main Menu
Entering 4 from the Change Mode Menu initiates a communication cycle with the HI7190 that invokes the System Positive Full Scale Calibration Mode with a notch
frequency of 10Hz. Other operating parameters are offset binary coding, bipolar mode and a gain of one.
Please note, the user should apply the positive full scale
voltage to the HI7190 inputs before issuing this command. Executing this command returns the user to the
Main Menu.
4
r
Read Menu
x
Exit Program
1
Entering 1 from the Write Menu invokes a write communication cycle with the Control Register. The user will be
prompted for the data to write. The software requires the
data be entered in hex, most significant to least significant format. The Control Register is 3 bytes. All three
bytes must be entered at the prompt.
2
Entering 2 from the Write Menu invokes a write communication cycle with the Offset Calibration Register. The
user will be prompted for the data to write. The software
requires the data be entered in hex, most significant to
least significant format. The Offset Calibration Register is
3 bytes. All three bytes must be entered at the prompt.
3
Entering 3 from the Write Menu invokes a write communication cycle with the Positive Full Scale Calibration
Register. The user will be prompted for the data to write.
The software requires the data be entered in hex, most
significant to least significant format. The Positive Full
Scale Calibration Register is 3 bytes. All three bytes
must be entered at the prompt.
4
Entering 4 from the Write Menu invokes a write communication cycle with the Negative Full Scale Calibration
Register. The user will be prompted for the data to write.
The software requires the data be entered in hex, most
Application Note 9505
key is touched to abort reads. It is generally not expected
that this register will be read in continuous mode.
significant to least significant format. The Negative Full
Scale Calibration Register is 3 bytes. All three bytes
must be entered at the prompt.
6
m Entering m from the Write Menu invokes the Main Menu.
r
Entering r from the Write Menu invokes the Read Menu.
x
Entering x from the Write Menu exits the program.
Read Menu:
Entering 6 from the Read Menu invokes a read communication cycle with the Negative Full Scale Calibration
Register. The user will be asked if a continuous read is
required. If continuous read is not requested, executing
this command will invoke a single read of the Negative
Full Scale Calibration Register, display the data and
return execution to the Main Menu. If continuous read is
requested, the read executions will continue until any
key is touched to abort reads. It is generally not expected
that this register will be read in continuous mode.
1
Data Output Register, ‘Read Once’
2
Data Output Register, ‘Read Continuous’
3
Command Register
4
Offset Calibration Register
Examples:
5
Positive Full Scale Register
6
Negative Full Scale Register
1. Write 8 (hex) to the Offset Calibration Register and
then read it back. To accomplish this task, choose the
Write Menu option from the Main Menu, choose the Offset Register option from the Write Menu. Enter 000008
at the prompt. The program returns to the Main Menu.
Now select the Read Menu option from the Main Menu,
choose the Offset Register option from the Read Menu.
The user will be prompted to decide upon a single read
or continuous read. Enter n for a single read. The data
read will be displayed on the screen and the program will
return to the Main Menu.
m Main Menu
w Write Menu
x
Exit Program
1
Entering 1 from the Read Menu invokes a read communication cycle with the Data Output Register. The Data
Output Register will be read one time, the data will be
displayed, and the program will return to the Main Menu.
2
Entering 2 from the Read Menu invokes continuous read
communication cycles with the Data Output Register.
Refer to the Software Clarifications section of this document for details on the displayed data. Continuous data
reads will be displayed until any key is pressed. When a
key is pressed, the program returns to the Main Menu.
3
Entering 3 from the Read Menu invokes a read communication cycle with the Control Register. The user will be
asked if a continuous read is required. If continuous read
is not requested, executing this command will invoke a
single read of the Control Register, display the data and
return execution to the Main Menu. If continuous read is
requested, the read executions will continue until any
key is touched to abort reads. It is generally not expected
that this register will be read in continuous mode.
4
Entering 4 from the Read Menu invokes a read communication cycle with the Offset Calibration Register. The
user will be asked if a continuous read is required. If continuous read is not requested, executing this command
will invoke a single read of the Offset Calibration Register, display the data and return execution to the Main
Menu. If continuous read is requested, the read executions will continue until any key is touched to abort reads.
It is generally not expected that this register will be read
in continuous mode.
5
2. Configure the device for bipolar mode, offset binary
coding, 10Hz filter notch frequency, gain of 1, and
conversion mode operation. Select the Change Mode
Menu option from the Main Menu and then the Custom
Menu option from the Change Mode Menu. When
prompted for data coding enter 0 for offset binary. The
next prompt is to enter the notch frequency, enter 10 for
10Hz. Next, the operational mode table is displayed,
choose 0 for conversion mode. The next prompt is for
bipolar/unipolar operation, enter 1 for bipolar mode. The
next screen displays the gain selection table, enter 1 for
gain equal 1. The program determines the data required
to configure the HI7190 as the user specified and
invokes the proper communication cycle. Execution
returns to the Main Menu.
Software Execution
The PORT_ID.DAT file contains the port identification for the
parallel printer port interfacing the HI7190 Evaluation board
to the PC. This file needs to be edited (as discussed in the
HI7190RDME.TXT file) before running the software. The
DOS MSD command can be used to find the printer port
identification.
Loading Software: Copy the four files (7190BTA5.CPP,
7190BTA5.EXE, PORT_ID.DAT, and 7190RDME.TXT) from
the diskette onto your PC hard drive into the directory of your
choice. The file 7190BTA5.CPP is the evaluation software
source code. The file 7190BTA5.EXE is the executable program and 7190RDME.TXT is a README file containing
valuable information. Please read the 7190RDME.TXT file
before continuing.
Entering 5 from the Read Menu invokes a read communication cycle with the Positive Full Scale Calibration
Register. The user will be asked if a continuous read is
required. If continuous read is not requested, executing
this command will invoke a single read of the Positive
Full Scale Calibration Register, display the data and
return execution to the Main Menu. If continuous read is
requested, the read executions will continue until any
5
Application Note 9505
Bypassing Calibration
Executing the Program: Change directory (cd) into the
directory containing the 7190BTA5.EXE file. At the DOS
prompt type 7190BTA5 [return]. The software reminds the
user to apply power to the board before continuing. At this
point the software is menu driven and self explanatory. However, it is important that the user has read the previous section, Software Description, before starting the evaluation.
The HI7190 calibration algorithm can be effectively
bypassed by writing all zeros into the Offset Calibration
Register and 800000 (hex) into the Positive and Negative Full Scale Calibration Registers if operating in bipolar mode. If operation is in unipolar mode write all zeros
into the Offset Calibration Register and 800000 (hex) into
the Positive Full Scale Calibration Register.
Software Clarifications
Display of Data Register in Continuous Mode
Resetting the DUT
Entering 2 from the Read Menu invokes a continuous read
of the Data Register. The following data is displayed: 1)
The binary output stream read from the HI7190, 2) The
binary output stream converted to hex, 3) The binary output stream converted to volts, 4) The mean voltage of the
last 10 conversion results, 5) The maximum voltage result,
6) the minimum voltage result, 7) The difference between
the maximum voltage and minimum voltage, and 8) standard deviation, dynamic range and ENOB, which is
updated in groups of 10 conversions.
Entering s from the Main Menu resets the HI7190 to its
initial state. The initial state of the HI7190 is as follows:
offset binary data coding, notch frequency of 30Hz, Self
Calibration mode, gain = 1, bipolar mode. The burn-out
current and sleep mode bits are inactive. The Serial
Interface configuration is MSB first bit positioning,
descending byte order, bidirectional I/O pin.
Writing the Control Register
Caution should be taken when writing the Control Register via the Write Menu. The least significant byte contains information regarding the Serial Interface
configuration that must be maintained when running the
software provided. To insure proper functionality of the
evaluation software, the Serial Interface must be configured in MSB first mode, descending byte order and bidirectional I/O pin operation. This configuration is
maintained by writing logic zeros into the 3 least significant bits of the Control Register.
NOTE: The CTRL input on the keyboard is used to “normalize” the
statistical output. For example, the maximum voltage is set to 5.5V
and the minimum is set to -5.5V. The maximum/minimum results displayed from then on will include only those conversions read since
“normalization”.
The Dynamic Range and ENOB Equations are as follows:
2
( 2.5 ) ⁄ 2
Dynamic Range = 10log10 -------------------------------------------------------2
2
V RMS – V REFNOISE
Invalid Inputs
Dynamic Range – 1.76
ENOB = -----------------------------------------------------------6.02
Entering invalid inputs at some menu prompts will lock
up the software. Generally a CTL-C will return the user to
the DOS prompt.
V MAX – V MIN
V RMS = ------------------------------------6.6
Notch Frequency Input
V REFNOISE =
When executing from the Custom Menu (of Change
Mode Menu) the notch frequency value must be entered
in decimal. That is, 2kHz is entered as 2000.

– 14 
 4.452 × 10
 (0.275 F N)
F N = Notch Frequency
6
-5V
+5V
C2
C1
0.01µF
7
C3
0.01µF
0.01µF
V-
4
TRIM
VOUT
2
V+
REF
5
6
U2
SMA
SMA2
SMA
+
SMA
SMA4
50
3 2 1
JP2
JMP3
C5
4.7µF AT 10V
VREF
R1
10K
JMP3
R10
JP1
J1 3
2
J2 1
+ C4
4.7µF AT 10V
ANALOG IN-
ANALOG IN+
C11
0.1µF
7
17
18
19
5
4
2
1
3
20
R8
10
10
6
RESET_
DGND
DRDY_
SYNC_
CS_
SD O
SCLK<
SD I/O
MODE
15
HI7190
U1
DVDD
16
3 2 1
J1
JMP3
+
TP1
CON1
1 CLOCK
OUT
10
R9
TP2 TP3 TP4
CON1 CON1 CON1
1
1
1
RESET'
SYNC'
DRDY'
CS'
SDO
SCLK
SDIO
MODE
+5VD
C7
0.01µF
CRYSTAL
Y1
C6
4.7µF AT 10V
CLOCK
SMA
SMA3
R2
14
AGND
AVSS
9
V
8 RHI
VRLO
10 V
CM
12 V
INHI
11 V
INLO
13 AV
DD
XTAL OSC
VCC
8
FOSC
7
DGND
OSC1
U3
OSC2
SMA1
+5VD 14
1B
+5V
2B
3B
4B
5B
6B
7B
-5V
8B
9B
10B
11B
12B
13B
+5VD
14B
15B
16B
17B
18B
19B
20B
21B
22B
CONNECTOR EDGE44AB
1A
2A
3A
4A
5A
6A
7A
-5V
8A
9A
10A
11A
12A
13A
+5VD
14A
15A
16A
17A
18A
19A
20A
21A
22A
+5V
J3
1N4000
D3
1N4000
D2
1N4000
D1
Application Note 9505
8
RESET'
SYNC'
DRDY'
CS'
SDO
SDIO
SCLK
MODE
8
1
5
2
12
U6C
74HC125
10
4
9
13
11
U6D
74HC125
6
U6B
74HC125
U6A
74HC125
3
CON1
1
TP6
3
5
7
9
12
14
16
18
2A4
2A3
2A2
2A1
1A4
1A3
1A2
1A1
2G
1G
74FCT244
2Y4
2Y3
2Y2
2Y1
1Y4
1Y3
1Y2
1Y1
U4
12
JP4
CON2
17
15
13
11
8
6
4
2
19
1
J2
CON2
12
DRDY
10k
R3
+5VD
11
10
9
6
7
8
SOCKET_16
16
15
14
13
12
U5
1
2
3
4
5
13
25
12
24
11
23
10
22
9
21
8
20
7
19
6
18
5
17
4
16
3
15
2
14
1
+5VD
CONNECTOR DB25
OPTION2
CON1
1
TP5
2.7k
R4
2.7k
R5
2.7k
R6
P1
Application Note 9505
Application Note 9505
HI7090 Evaluation Board
COMPONENTS LAYOUT
COMPONENT SIDE
GROUND PLANES
9
Application Note 9505
HI7090 Evaluation Board (Continued)
POWER PLANE
SOLDER SIDE
10
Application Note 9505
HI7190 EVALUATION BOARD COMPONENT LIST
ITEM
QUANTITY
REFERENCE
PART
1
7
C1, C2, C3, C7, C8, C9, C10
0.01µF
2
3
C4, C5, C6
10µF at 16V Tantalum
3
1
C11
0.1µF
4
3
D1, D2, D3
1N4000
5
3
JP1, J1, JP2
JMP3 - Strip 1 x 3
6
2
JP4, J2
CON2 Wire Strap
7
1
J3
Connector Edge 44AB
8
1
P1
Connector DB25
9
1
R1
10K 5%, 1/4Ω
10
3
R2, R8, R9
10 5%, 1/4Ω
11
3
R4, R5, R6
2.7K 5%, 1/4Ω
12
1
R10
49.9 1%, 1/4Ω
13
1
U1
HI7190
14
1
U2
REF (LT1019CN8-2.5)
15
1
U3
XTAL OSC 10MHz
16
1
U4
74HC244 (INTERSIL)
17
1
U6
74HC125 (INTERSIL)
18
1
Y1
Crystal 10MHz
All Intersil semiconductor products are manufactured, assembled and tested under ISO9000 quality systems certification.
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design and/or specifications at any time without
notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate
and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which
may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see web site http://www.intersil.com
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