an1672

Application Note 1672
ISL26134AV28EV1Z Evaluation Board User Guide
General Description
Features
The ISL26134AV28EV1Z provides a means to evaluate the
functionality and performance of the ISL26134 A/D converter.
• Galvanically-isolated USB communication with PC
The board includes an AT90USB162 microcontroller with a
USB interface. The microcontroller interfaces to the ISL26134
ADC via a galvanically-isolated interface and provides serial
communication via USB between the board and the PC.
• On-board voltage reference
Software for the PC provides a GUI (graphical user interface)
that allows the user to perform data capture, and then to
process and plot the results of the time domain analysis, the
histogram analysis, and/or the frequency domain analysis on
the captured data. The GUI also enables the user to save
conversion data from the ADC to a file, or to save the results of
the analyzed conversion data.
Ordering Information
PART NUMBER
ISL26134AV28EV1Z
DESCRIPTION
Evaluation Board
• On-board microcontroller
• Evaluation software
- Time domain analysis
- Noise histogram analysis
- FFT analysis
Hardware
The ISL26134AV28EV1Z evaluation board provides the user a
means of evaluating the ISL26134 Analog-to-Digital Converter
(ADC). The ISL26134 is a high performance 24-bit ADC that
includes a very low noise programmable gain amplifier. The
ISL26134 offers gain selections of 1x, 2x, 64x and 128x. It
offers word rates of 10Sps and 80Sps (clock = 4.9152MHz).
Gain and word rate selections are made by pin function control
through jumper selections.
The board comes with an ISL26134 soldered in place. This can
be removed and an ISL26132 soldered in its place.
FIGURE 1. IMAGE OF THE EVALUATION BOARD FOR THE ISL26134
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CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 2011, 2014. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
Application Note 1672
Evaluation Board Overview
The ISL26134AV28EV1Z evaluation board is segmented into two
sections. These sections are galvanically isolated with a multichannel isolation chip. The ISL26134 ADC and its associated
circuitry (voltage reference and input signal components) are
isolated from the microcontroller-USB interface to the PC. The
ADC and its associated circuitry are powered by a laboratory
supply. The microcontroller with its USB interface is powered
from the USB connection. Galvanic isolation is not necessary in
every application. The purpose of the isolation is to eliminate
noise from the USB ground power connection from affecting the
sensitive measurements made by the ADC when used in the 64X
or 128X gain settings.
The ADC section of the evaluation board has three banana jack
power connections. One of these is AGND which serves as the
power supply ground connection for the ADC segment of the
board. The DVDD jack supplies the digital side of the ADC (3.3V
to 5V). The AVDD jack supplies the analog portion of the ADC (5V)
and powers the voltage reference. The voltage reference is an
Intersil ISL21009BFZ25 2.5V reference. A header is provided to
also use an external voltage reference for the ADC.
The microcontroller provides the USB interface to the PC. A
software GUI is available to communicate with the
microcontroller and provides the means to collect and analyze
data for the ADC.
FIGURE 2. BLOCK DIAGRAM OF THE EVALUATION BOARD FOR THE ISL26134
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Application Note 1672
ADC Section
The Microcontroller Section
The ADC offers different sample rates, gain, and input channel
options. These are selected by setting jumpers on headers
(1 = positive supply; 0 = ground) as shown in the table on the
bottom of Figure 3.
Figure 6 illustrates the microcontroller circuitry. There is a reset
button provided but it is seldom necessary because the
microcontroller has its own power-on reset which will initialize
the microcontroller when the USB interface is connected to a
powered PC. Power for the microcontroller section comes from
the USB interface. The microcontroller circuit includes a DIP
switch and some LEDs. The DIP switch is for future use and its
switch positions are not meaningful to the current application.
The ADC uses a 4.9152MHz crystal operating with an on-chip
amplifier for its clock source. This can be disconnected and an
external clock can be sourced to drive the clock input to the chip.
Alternately, the XTALIN/CLOCK pin can be grounded and the ADC
will operate from an on-chip RC type oscillator.
The board provides a 2.5V reference IC as the voltage reference
for the ADC, or an external voltage can be connected to a
terminal block and selected through jumpers on headers J28 and
J30 as shown in Figure 5. These headers also provide the option
of selecting AVDD and AGND as the inputs to VREF+ and VREFon the ADC.
The evaluation board provides separate terminal connections for
each of the differential signals into the ADC. These terminals are
in shown in Figure 4. Be attentive of the labeling of the
connections and their polarities when connecting external
signals. The channel numbers on the terminal blocks are not in
numeric order and some have their polarities labeled opposite of
others.
Header connector J22 in Figure 4 allows the user to select one of
the following options for the common mode voltage; the 2.5V
voltage reference output, ground (AGND), a voltage generated by
a resistor divider that divides the AVDD supply using two 1kΩ
resistors, or to an voltage determined by the user which must be
connected to the hole next to the header connection labeled FLT
(Floating Input).
The microcontroller circuit includes a header through which the
flash memory on the microcontroller is programmed. A second
header provides a means for the user to monitor the signals
(SCLK and SDO/RDYb — on the J22 header these are labeled as
MOSI and MISO [Master Out, Slave In and Master In, Slave Out]
respectively) from the microcontroller that communicate with the
ADC.
One LED lights up to indicate when power is applied to the USB
interface. A second LED indicates when the microcontroller is
available to collect data from the ADC. The microcontroller
communicates with the ADC via the galvanic isolator chip. The
microcontroller side of the isolator is powered by the voltage
from the USB connection. The USB connection can be powered or
unpowered without regard to the supplies to the ADC side of the
board. There is no power sequence requirement between the two
sections of the board.
Each of the input channels has jumpers to allow the user to
connect the common mode voltage to either the AIN+ or the AINinput. This enables the external circuit to be biased to a common
mode value supplied by the board. If both jumpers are put in
place, the inputs will be shorted to the common mode voltage.
This provides a means for testing the noise performance of the
ADC with its inputs shorted.
The ADC interfaces to the microcontroller through the galvanic
isolators. The ADC side of the isolator chip is powered by the
same supply that powers the DVDD supply of the ADC.
Power from an external supply must be provided to the DVDD
(3.3V to 5V), AVDD (5V) and AGND banana plug connectors for
the ADC portion of the board to function. LEDs will be illuminated
by DVDD and AVDD when they are powered. Note that these
supplies can be applied and removed without regard to whether
the USB interface is connected and powered or not.
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DVDD
AVDD
R4
R1
200
J4
SMA
R3
NO-POP
4
1
AGND
XTALIN/CLOCK
XTALOUT
VREF+
VREF-
20
19 VREF+
VREF-
AIN1+
AIN1-
11
12 AIN1+
AIN1-
AIN2+
AIN2-
18
17 AIN2+
AIN2-
AIN3+
AIN3-
13
14 AIN3+
AIN3-
AIN4+
AIN4-
16
15 AIN4+
AIN4-
ISL26134
A1
A0
SPEED
SCLK
GAIN1
SDO/RDY
GAIN0
3
1
J5
A1
A0
3
3
AGND
AGND
7
AGND
U2
AGND
8
16
A0
25
27
24
28
23
SCLK
OUT1
SDO/RDY
OUT3
GAIN0
A1
A2
A3
A4
EN2/NC
9
15 GND2
GND2
DVDD
VDD1
VDD2
14
13 B1
12 B2
11 B3
B4
10
EN1/NC
GND1
GND1
1
3
4
5
6
SCLK
R36
7
2
8
DVDD
DGND
DVDD
SI8441BB
AGND
R9
10k
J7
2
C13
X7R
2700pF
AGND
J29
1
J3
AGND
DGND
AGND
A1
26
C8
X7R
0.1µF
C6
X7R
0.1µF
SPEED
Y1
4.9152MHz
4
6
DGND
DGND
5
2
AGND
21
J6
2
2
GAIN1
PWDN
U1
ISL26134
1
J1
2
CAP
DVDD
USB_5V
3
10
DVDD
RED
D1
RED
D2
DVDD 1
AVDD
CAP
AVDD
AGND
DVDD
AGND
DVDD
J19
1
2
GAIN1
3
PWDN
GAIN0
3
HDR2X1
AGND
A0
AGND
AGND
A1
CHANNEL
GAIN0
GAIN1
GAIN
SPEED
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0
0
AIN1
0
0
1
0
10
1
0
AIN2
1
0
2
1
80
0
1
AIN3
0
1
64
1
1
AIN4
1
1
128
FIGURE 3. ADC WITH POWER SUPPLY CONNECTIONS, JUMPER SELECTIONS, AND ISOLATOR INTERFACE
DGND
1k
MISO
Application Note 1672
C10
NO-POP
0.1µF
DVDD
J21
DVDD
AGND
AGND
AGND
9
AVDD
J23
C12
X7R
0.1µF
AGND
C1
POLY
0.10µF
200
R2
200
C11
X7R
0.1µF
AVDD
AGND
DVDD
22
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Schematics
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Schematics
(Continued)
AIN1+
C3
X7R
0.01µF
2
AIN1+
1
AIN1-
J9
HDR2X1
C2
X7R
4700pF
J8
CMB
J10
HDR2X1
AGND
AIN1C4
X7R
0.01µF
5
AGND
AIN3+
J15
C15
HDR2X1
X7R
0.01µF
2
AIN3+
C14
X7R
4700pF
J14
CMB
J16
HDR2X1
AGND
AIN3C16
X7R
0.01µF
AGND
AIN4C18
X7R
0.01µF
2
AIN4-
1
AIN4+
J18
HDR2X1
C17
X7R
4700pF
J17
AVDD
CMB
AGND
J20
HDR2X1
AIN4+
C19
X7R
0.01µF
CMB
AGND
J22
HDR4X2
1
2 2.5V
3
4 GND
5
6 RDIV
7
8
2
AIN2-
1
AIN2+
J11
C5
X7R
4700pF
2.5V_VREF
FLT
R20
1k
AIN2J12
C7
HDR2X1
X7R
0.01µF
R19
1k
AGND
CMB
AGND
J13
HDR2X1
AGND
AIN2+
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C9
X7R
0.01µF
AGND
FIGURE 4. ANALOG INPUTS AND COMMON MODE SELECTION SELECTIONS
Application Note 1672
1
AIN3-
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Schematics
(Continued)
AVDD
J28
HDR3X2
AVDD 1
2
VREF+ 3
4
2.5V 5
6
R12
10
VREF+
2.5V_VREF
2
VREF+
6
C28
X7R
0.1µF
1
VREFJ24
GND
VREFGND
R13
10
AGND
U6
AGND
C20
X7R
1µF
1
2
3
4
GND_OR_NC
VIN
DNC
GND
ISL21009BFB825
2.500V
AGND
DNC
DNC
VOUT
TRIM
8
7
6
5
2.5V_VREF
C21
X7R
0.1µF
AGND
FIGURE 5. VOLTAGE REFERENCE AND VOLTAGE REFERENCE SELECTION OPTIONS
VREF-
Application Note 1672
AVDD
J30
HDR3X2
1
2
3
4
5
6
C29
NO-POP
47µF
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Schematics
(Continued)
SCLK
3
MOSI
MISO
CS
USB_5V
USB_5V
J26
HDR4X2
1
2
J27
HDR3X2
4
5
6
MISO
7
8
SCLK
RESET
1
2
3
4
5
6
MOSI
DGND
C27
C25
X7R
X7R
X7R
0.01µF
0.1µF
0.1µF
C26
DGND
USB_5V
USB_5V
7
DGND
R11
47k
LED3
RESET
LED2
LED1
RESET
3
2
4
S1
U3
DGND
USB_5V
24
22
RESET
PC7(INT4/ICP1/CLKO)
PC6(OC.1A/PCINT8)
4
32
27
USB_5V
VBUS
PC5(PCINT9/OC.1B)
VCC
PC4(PCINT10)
AVCC
PC2(PCINT11)
C24
X7R
1µF
PD0(OC.0B/INT0)
PD1(AIN0/INT1)
PD3(TXD1/INT3)
FB1
PD4(INT5)
J25
PWR
DD+
USB
GND
CASE
CASE
PD5(XCK/PCINT12)
DGND
22
R5
29
2
22
R10
3
30
31
4
28
PD6(RTS/INT6)
D+/SCK
PD7(CTS/HWB/T0/INT7)
2
8.000MHz
3
C22
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DGND
DGND
COG
22pF
22pF
DGND
PC5
PC4
PC2
6
7
8
9
PD3
4
5
11
3
6
12
2
7
13
1
8
10
UGND
PB0(SS/PCINT0)
PB2(PDI/MOSI/PCINT2)
XTAL1
PB3(PDO/MISO/PCINT3)
PB4(T1/PCINT4)
PB5(PCINT5)
XTAL2
PB6(PCINT6)
GND
PB7(PCINT7/OC.0A/OC.1C)
14
SW4
SW3
SW2
SW1
SCLK
16
MOSI
17
MISO
18
19
20
21
AT90USB162-16AU
DGND
FIGURE 6. MICROCONTROLLER WITH USB INTERFACE
SW-DIP4
PB0
15
C23
COG
PC6
S2
PB1(SCLK/PCINT1)
1
PC7
UVCC
6
Y2
5
R8
200
D-/SDATA
5
USB-B
26
R7
200
UCAP
PD2(RXD1/AIN1/INT2)
1
23
25
R6
200
CS
PB5
PB6
PB7
DGND
Application Note 1672
1
Application Note 1672
Software
The evaluation board has GUI software available that runs on the
PC. ISL26134AV28EVZ1 evaluation boards manufactured before
June, 2014, use different uC code (Version 5) and a different PC
GUI (Version 1.1). Boards manufactured after June, 2014, use uC
code Version 7 and PC GUI Version 3.
The software (uC code Version 7 and PC GUI Version 3) is
designed to operate under Windows XP or later, including WIN8.
Read “Appendix #1 How to Obtain and Install the GUI Software”
on page 19 to obtain the internet link to download the GUI
software.
Once the PC GUI software is copied onto the PC, click on the
isl261xx_installer_v3.exe file and follow the on screen
instructions to load the software. Note that the software uses the
USB interface to communicate with the evaluation board. The
software uses the USB HID driver that is part of the Windows
operating system so it is not necessary to load any other drivers
for the USB interface.
Running the GUI
Before starting the GUI software, the evaluation board should be
connected to the PC by means of a USB cable.
With the board connected via USB, run the GUI program by
selecting Start → All Programs → Intersil → ISL261XX →
ISL261XX Evaluation Software.
If the software is started before the connection to the board is
made, the GUI will output a message (USB Status: Not
Connected) as shown in Figure 7.
If this occurs, connect the evaluation board to the PC with the
USB cable. The message should automatically change as shown
in Figure 8.
Using the GUI Software
When the GUI software is started and the USB connection is
established, the GUI will present a menu as shown in Figure 8.
The Initialize button is colored red to indicate that it is waiting for
a part number to be chosen in the Device Selection window.
The user must pick a part number from the Device Selection
Window and click on the Initialize button. This causes the
software GUI to be configured to support the selected device. The
ISL2613X number represents the ISL26132 or ISL26134.
Once the Initialize button is clicked with the ISL2613X selection,
the screen will change slightly to indicate the output word rate
options of the ISL2613X ADC. Note that the actual word rate
used by the ADC is selected by a jumper on the evaluation board.
The selection here in the Sample Frequency window only tells the
GUI software which sample rate is to be used for the frequency
axis when graphing the spectrum for the spectral (FFT) plot.
The top line of the menu page has two options, File and About.
The File selection will be discussed after the Time Domain,
Histogram and Frequency Domain windows are selected. When
the GUI is started it sends a command to the evaluation board
and tells the microcontroller to send back the version of the code
that is in the microcontroller. If About is selected, the GUI will
open a window that indicates the version number of the
microcontroller code, and the version of the GUI software, as
shown in Figure 10.
FIGURE 7.
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Application Note 1672
FIGURE 8.
FIGURE 9.
FIGURE 10.
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Application Note 1672
Time Domain Window
The Time Domain window allows the user to collect samples from
the ADC on the evaluation board and display them in the time
domain. The number of samples is initially defaulted at 64, but
can be set in a pull-down window from 1 to 1048576. Realize the
time involved if a large number of samples is requested on an
ADC with a slow sample rate. When the Acquire button is clicked,
the samples will be collected and the samples up to 256 will be
displayed in the graphing window. If greater than 256 samples
are collected, then, after the samples are captured and the first
256 are displayed, the time plot of the entire sample set can be
displayed by clicking on the Pop Out button. Figures 11 and 13
illustrate the capture of 4096 samples. The window in Figure 11
displays only the first 256 samples. Figure 13 illustrates the
results when the Pop Out button has been selected.
FIGURE 11.
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Application Note 1672
Buttons at the top of the plot provide several user graph tool
functions as shown in Figure 12.
Check Box: Allows customization of axis labels/plot title as
shown in the Figure 13.
These are also available in the Histogram and Frequency Domain
windows.
Disk: Saves the plot as an image. When selected, a window will
open that offers several image format options.
House: Zooms to the original zoom scale factor.
Once the data from the ADC has been captured, the data can be
saved to a file. The histogram data and the spectrum data can
also be saved. See “Appendix #2 Data File Formats” on page 19
for a discussion of the formats of the saved files. Note that the
raw data (conversion words from the ADC) files can also be read
back into the GUI once saved or, data collected from another
source can be read into the GUI software for analysis if the proper
data format is used. See “Appendix #2 Data File Formats” for
details.
Left/Right: Goes back/forward 1 zoom command. So if you
zoom in twice and want to go back to the first zoom, you’d click
the left arrow.
Four Points: Moves the axes around.
Magnifying Glass: Zoom box.
Scaling Icon (Up/down/left/right): Changes the size of the plot in
the window. You can scale the graph as large as the border.
FIGURE 12.
FIGURE 13.
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Application Note 1672
FIGURE 14.
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Application Note 1672
Histogram Window
codes that are counted in one bin of the histogram. This number
is defaulted to “1”.
If one clicks on the histogram window after collecting data using
the Time Domain window, the histogram of the time domain
data will be plotted. Alternatively, the Histogram window provides
the user options to set the number of samples to be collected
and to acquire a new sample set based upon this selection. The
Bin Width window allows the user to set the number of converter
When the histogram is plotted, the plot includes markers for the
mean value (red vertical line) and for one standard deviation
from the mean on each side (green dashed lines). Signal
statistics are listed in the plot itself and in the text boxes below
the graph. The Pop Out button shows the graph without the
statistics listed.
FIGURE 15.
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Application Note 1672
Frequency Domain
If the user has collected data in either the Time Domain window
or the Histogram window, and then clicks on the Frequency
Domain menu option, the data will be processed with the FFT
algorithm and the resulting spectral information will be
displayed, as shown in Figure 16. The red lines mark harmonics.
If no signal is present, the software assumes the highest point in
the spectrum is the fundamental. If the log(freq) check box is
checked, the spectral plot will be graphed with the frequency axis
on a Log scale, as shown in Figure 19. If the Grounded Input Test
check box is checked, and data is collected with the input to the
converter shorted, the GUI software will calculate the various
parameters such as SNR (signal-to-noise ratio) by computing the
ratio of an artificial full-scale sine wave to the total noise in the
bandwidth. The Grounded Input Test check box should only be
checked if there is no actual signal input into the converter. Note
that if the Grounded Input Test check box is not checked, the
software will compute parameters such as SNR, by calculating
the ratio of the largest magnitude component in the spectrum
(other than the DC offset) to the noise.
FIGURE 16.
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Application Note 1672
There are several different selectable options in the Frequency
Domain window. The number of samples can be set up to
1048576 using a pull down menu as shown in Figure 17. Note
that the Frequency Domain software must have at least 1024
samples to compute a proper spectral plot.
The software also allows a number of different window functions
to be used. The different windowing options can be selected in
the Windowing pull-down menu as shown in Figure 18. These are
normally used when testing is performed with a sine wave as the
input signal. This same software GUI supports other ADC
platforms (high speed SAR ADCs) where these windowing
options are more commonly used.
Figure 19 illustrates the spectral plot of one data set of 4096
samples. The results of the FFT can be averaged by setting the
Mode radio button option to Ave. and then using the window next
to the “Ave.” button to set the number of data sets to be
averaged. When averaging is performed, the output results of
many FFTs are averaged and produce a spectral plot with
smoothed (averaged) spectrum as shown in Figure 20.
Recall that the spectrum plot data can be saved by clicking on
the File → Save → Spectrum Data option at the top of the
window.
FIGURE 17.
FIGURE 18.
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Application Note 1672
FIGURE 19.
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Application Note 1672
FIGURE 20.
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Application Note 1672
ISL26134AV28EV1Z Bill of Materials
ITEM QTY
REFERENCE
PART NUMBER
MANUFACTURER
DESCRIPTION
1
1
C1
ECH-U1C104JX5
PANASONIC
CAP, 0.10µF, 5%, PPS FILM, 1210
2
4
C2, C5, C14, C17
C0805C472J5RAC
KEMET
CAP, 4700pF, X7R, 0805, 50V, 5%
3
9
C3, C4, C7, C9, C15,
C16, C18, C19, C27
C0805C103J5RAC
KEMET
CAP, 0.01µF, X7R, 0805, 50V, 5%
4
9
KEMET
CAP, 0.1µF, X7R, 0603, 25V, 5%
5
1
C13
C0603C272J5RAC
KEMET
CAP, 2700pF, X7R, 0603, 50V, 5%
6
1
C20
C0603C105K4RACTU
KEMET
CAP, 1µF, X7R, 0603, 16V, 10%
7
2
C22, C23
C0603C220J5GAC
KEMET
CAP, 22pF, COG, 0603, 50V, 5%
8
1
C24
C0805C105J4RAC
KEMET
CAP, 1µF, X7R, 0805, 16V, 5%
C6, C8, C10, C11, C12, C0603C104J3RACTU
C21, C25, C26, C28
9
1
C29
C1210C476M9RACTU
KEMET
CAP, 47µF, 20%, 6,3V, X7R, 1210
10
5
D1, D2, LED1, LED2,
LED3
SML-LX1206IC-TCR
LUMEX OPTO
LED, SMT 3216 , RED
11
1
FB1
MI0805M221R-10
LAIRD - SIGNAL
INTEGRITY
FERRITE CHIP POWER 220 OHM SMD
12
5
J1, J5, J6, J7, J29
TSW-103-07-G-S
SAMTEC
STAKE HEADER, 3x1, 0.1" CTR, GOLD
13
9
J3, J9, J10, J12, J13,
J15, J16, J18, J20
TSW-102-07-G-S
SAMTEC
STAKE HEADER, 2x1, 0.1" CTR, GOLD
5-1814832-1
TYCO
CONNECTOR, SMA, GOLD PLATED
1729128
PHOENIX CONTACT
CONN TERM BLOCK 2POS 5.08MM
111-2223-001
EMMERSON
BINDING POST, GROUNDED TYPE NICKEL
PLATED
TSW-104-07-G-D
SAMTEC
STAKE HEADER, 4x2, 0.1" CTR, GOLD
67068-9000
MOLEX
CONN USB RT ANG RECPT TYPE B WHT
14
1
J4
15
5
J8, J11, J14, J17, J24
16
3
J19, J21, J23
17
2
J22, J26
18
1
J25
19
3
20
6
21
1
R3
22
2
R5, R10
J27, J28, J30
TSW-103-07-G-D
SAMTEC
STAKE HEADER, 3x2, 01." CTR, GOLD
DALE
RES, 200Ω, 0805, 1/10W, 1%. 100ppm
NP-RES-0805
N/A
DO NOT POPULATE
CRCW0805220J
DALE
RES, 22Ω, 0805, 1/10W, 5%, 200ppm
R1, R2, R4, R6, R7, R8 CRCW08052000F
23
1
R9
CRCW0805103J
VISHAY
RES, 10k, 0805, 1/10W, 5%. 200ppm
24
1
R11
CRCW0805473J
DALE
RES, 47k, 0805, 1/10W, 5%, 200ppm
CRCW0805100J
VISHAY
RES, 10Ω, 0805, 1/10W, 5%. 200ppm
CRCW08051001F
DALE
RES, 1k, 0805, 1/10W, 1%. 100ppm
25
2
R12, R13
26
3
R19, R20, R36
27
1
S1
B3F-1000
OMRON
SWITCH. PUSHBUTTON SPST 6x6mm
28
1
S2
5435640-2
TYCO
SWITCH DIP 4POS UNSEALED GOLD
29
1
U1
ISL26134AV28
INTERSIL
PRECISION ADC, TSSOP28 PKG
30
1
U2
SI8441BB
SILICON LABS
DIGITAL ISOLATOR, QUAD CHANNEL,
SOIC16 WIDE BODY PKG
31
1
U3
AT90USB162-16AU
ATMEL
MICROCONTROLLER, USB CONTROLLER,
8-BIT, 16k FLASH, TQFN32 PKG
32
1
U6
ISL21009BFB825
INTERSIL
VOLTAGE REFERENCE, 2.5V, ±0.5%, 3ppm,
SOIC8
33
1
Y1
CMR309T-4.9152MABJ-UT
CITIZEN
CRYSTAL, 4.9152MHz, TUBULAR,
MINIATURE
34
1
Y2
CMR309T-8.000MABJ-UT
CITIZEN
CRYSTAL, 8.000MHz, TUBULAR,
MINIATURE
35
12
881545-2
TE CONNECTIVITY
SHUNT, LP W/HANDLE, 2 POS, 30AU
36
1
UB 12-03
SF CABLES
CABLE, USB 2.0 A MALE TO B MALE, 3FT
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18
NOTES
INSTALL AFTER
WASH PROCESS
AN1672.1
November 17, 2014
Application Note 1672
Appendix #1 How to Obtain and
Install the GUI Software
The following is the address for the ISL26134 product page on
the Intersil web site.
http://www.intersil.com/products/ISL26134
Go to this link to find the tab where the PC GUI software installer
can be downloaded. Note that the software installer does have a
license agreement that will be presented when the software is
loaded onto your PC.
Appendix #2 Data File Formats
The GUI software allows the user to save data from the time
domain (raw data), data from the histogram processing, and
data from the spectrum processing segments of the software. It
also allows raw data (time domain data) files to be read back
into the GUI if they have the proper header and format.
Raw Data
As an example, a time domain collection of only 8 samples has
been collected and saved to a file. The content of the file that is
saved has the following format:
ISL2613X
80.0
24
8
-394
-361
-405
-411
-397
-416
-423
-416
0
0
4
4
7
15
29
47
54
79
84
96
112
107
99
87
71
57
40
14
11
2
3
1
0
Spectrum Data
A data set of 1024 points was collected at a sample rate of
80Sps. The FFT output will produce a spectrum plot with 512
Bins of magnitude data. Only the beginning and ending portion of
the data file has been reproduced here. Note that the Bins start
at 0 frequency and increase to one half the sample rate (40Hz).
Note that the magnitude in dB is the magnitude of the noise in
dB below full-scale rms but it is scaled based upon magnitude/
√BIN, not magnitude/√Hz.
The file has a header that consist of the part number (ISL26134),
the sample rate (80), the number of bits in the conversion word
(24), and the number of samples in the file (8). The header is
followed by the 8 conversions words in signed decimal format.
Histogram Data
A data collection of 1024 data words was collected and the
histogram performed. The histogram data was then saved into a
file. The content of the file has the following format. The
histogram statistics are listed first, followed by the converter
codes and their respective histogram counts.
Signal Statistics
Min: -486
Max: -462
Range: 25
Mean: -472.762
StDv: 3.631
Code
-488
-487
-486
-485
-484
-483
-482
-481
-480
-479
-478
-477
-476
-475
-474
-473
-472
-471
-470
-469
-468
-467
-466
-465
-464
-463
-462
-461
Freq
Magnitude (dB)
0.0
-152.176082921
0.078125
-150.765450438
0.15625
-151.161495054
0.234375
-161.302103964
0.3125
-152.403880548
0.390625
-153.371854853
0.46875
-147.933929413
0.546875
-140.814871676
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
39.375
-158.163736345
39.453125
-186.035243892
39.53125
-162.574730282
39.609375
-161.238997758
39.6875
-160.482611598
39.765625
-157.776276313
39.84375
-156.626469649
39.921875
-158.855304029
All Data (Excel)
The advantage of saving data with this option is that the raw
data, the histogram data, and the spectrum data will all be saved
on separate sheets of the spreadsheet, but the version of Excel
that is supported only allows up to 32k samples.
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AN1672.1
November 17, 2014
Application Note 1672
Load Data Function
The GUI allows raw (time domain) data to be loaded back into the
GUI. Alternately, the user might collect data in another system
and import the conversion word data into the GUI to perform
analysis. To be able to read the data the file must have the proper
header (as discussed in “Raw Data” on page 19 of this appendix).
The header must have a header with a part number (this can be
something other than a chip number), sample rate, number of
bits in the converter, and the number of samples, followed by the
data in decimal format. The largest value of any reading cannot
exceed one half 2n (n = number of bits in the converter). For
example, if the number of bits in the converter is 12, then the
largest reading can be no greater than (212)/2 or 2048.
ISL2613X
80.0
24
8
-394
format
-361
-405
-411
-397
-416
-423
-416
>
>
>
>
>
part number
sample rate
number of bits in the converter
number of data samples in the file
conversion data in signed decimal
Appendix #3 Evaluation Board
Factory Jumper Settings
The photograph in Figure 21 indicates the position of the header
shunts when the board is shipped from the factory.
Header J22 is connected with the 2.5V reference selected as the
common mode voltage.
Headers J9 and J10 are shorted with shunts to connect the
common mode voltage to the AIN1+ and AIN1- signals coming
from the terminal block connector. This effectively shorts both
inputs to channel 1 on the ADC to the common mode voltage and
enables the ADC to be tested with a shorted input. One or both of
these jumpers must be removed if the ADC is to measure a
signal on this channel.
Headers J1 and J5: these are set to select logic 1, A0 = A1 = 0 =>
Channel = 1.
Headers J 29 and J7: These are set to select logic 1,
Gain0 = Gain1 = 1 => => Gain = 128X.
Header J6: Set to select logic 1. Speed = 1 => 80Sps.
Headers J28 and J30: the 2.5V_VREF option is selected on J28.
The AGND option is selected on J30. These enable to 2.5V
voltage reference chip to be the voltage reference for the ADC.
DIP switch: Switches S2-1, S2-2, S2-3 and S2-4 cannot be in the
closed (ON) position. With all four switches in this position the
board is in a factory test mode and will not function properly with
the PC software GUI. If the factory test mode is selected LED3
will be lighted.
FIGURE 21.
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20
AN1672.1
November 17, 2014
Application Note 1672
Appendix #4 Evaluation Board Layout and Component Placement
FIGURE 22. TOP LAYER
FIGURE 23. BOTTOM LAYER
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21
AN1672.1
November 17, 2014
Application Note 1672
Appendix #4 Evaluation Board Layout and Component Placement
(Continued)
FIGURE 24. COMPOSITE OF LAYERS
Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is
cautioned to verify that the Application Note or Technical Brief is current before proceeding.
For information regarding Intersil Corporation and its products, see www.intersil.com
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22
AN1672.1
November 17, 2014
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