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Application Note 9518
( 2.5 ) /2
V RMS = ------------------------------------
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 dis-
played from then on will include only those conversions read since
“normalization”.
The Dynamic Range and ENOB Equations are as follows:
2
2
Dynamic Range =10log 10 ---------------------
V RMS
Dynamic Range -1.76
ENOB = -----------------------------------------------------------
6.02
V MAX – V MIN
6.6
Resetting the DUT
Entering s from the Main Menu resets the HI7188 to its initial
state. The initial state of the HI7188 is as follows: Convert 1 log-
ical channel (physical channel 1, bipolar inputs, gain of 1, con-
version mode), bypass line noise rejection filters. The serial
interface configuration is MSB first bit positioning, descending
byte order, bidirectional I/O Pin. This reset function is also
accessible from the sub-menus as previously described in the
Software Description Section of this document.
Resetting the I/O of DUT
Entering i from the Main Menu resets the HI7188 serial inter-
Helpful Hints
Start with the Con?guration Menu
Novice users should consider reviewing and exercising the
Con?guration Menu picks ?rst. The Con?guration Menu
offers a wide range of functions that allow the user to quickly
program and report on the HI7188 con?guration.
When programming the initial con?guration, use pick 3. This
will prompt for both chip level and channel con?guration
information. After the initial con?guration is complete it is
generally useful to use picks 1 or 2 when making con?gura-
tion revisions. Use of picks 1 or 2 allow chip level or channel
speci?c programming, respectively.
Make use of Con?guration Files
Understand and make use of the con?guration ?le restore
capability. This capability allows the user to “fully” con?gure
the HI7188 with a single command.
Configuration files may be hand crafted with a text editor of
your choice or they may be generated via the Configuration
Menu. Recall that when the HI7188 is configured for a calibra-
tion mode that the CCR bits will return to normal mode auto-
matically. Therefore, it is recommended that when using the
Configuration Menu to generate a configuration file, the user
save the configuration file before executing the command.
face controller. This has no affect on the HI7188 con?gura-
tion, only the synchronization of the serial interface is
affected. As this hardware and software has been tested and
I/O synchronization is automatically maintained, this menu
pick will seldom be used. This serial interface reset function
is also accessible from the sub-menus as previously
described in the Software Description Section of this docu-
ment.
All Intersil semiconductor products are manufactured, assembled and tested under ISO9000 quality systems certi?cation.
Intersil semiconductor products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design and/or specifications at any time with-
out 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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