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3
Analysis Mode
3.1
Switch Functions
3.2
Measurement Modes
v =
2
1
-
24
x
v
REF
A
·
(3)
Analysis Mode
In Analysis mode, the ADS1230REF analyzes code output from the ADS1230 and displays it in different
ways.
Table 3
summarizes the numerous display modes available, together with example displays.
Table 3. Modes and Example Displays
Hex Code
Dec Code
Voltage
ENOB
Raw
1992E9H
+1676001
+499.488M
n/a
RMS
n/a
+5.789
+17.495N
+23.18BIT
Peak-to-Peak
n/a
+31.256
+90.293N
+21.92BIT
Averaged
n/a
+1676001
+499.488M
n/a
The ADS1230REF operates in Analysis mode when the mode switch is set to the ANALYSIS position.
The default Analysis mode is RAW HEX.
To change measurement types, hold down DISP and press MODE. This function cycles through the four
available measurement types. When DISP is released, the newly selected measurement is made. To
change units, press UNIT. This option cycles through the available units for the active measurement type.
This procedure can also be done while DISP is depressed; in that case, the new unit is shown by name
on the display. The measurement modes are described in detail in
Section 3.2
.
The ADS1230 itself can be configured directly from this mode, as described in
Section 3.1
.
NEW BLOCK: Pressing this switch resets the collection process for the RMS, peak-to-peak, and
averaged measurements.
UNIT: Cycles between available units. Not all units are available in all modes.
DISP: When this switch is pressed, the display shows the current measurement mode and unit. While
DISP is still pressed, pressing NEW BLOCK / MODE cycles through the available measurement modes.
CHIP: Holding this switch down allows the settings of the ADS1230 to be changed, using the PARM
(NEW BLOCK) and VAL (UNIT) buttons.
Pressing PARM while DISP is pressed down cycles through the available parameters—gain, data rate,
and active channel.
The gain setting is displayed as
GAIN=
followed by the gain setting. Gains of 64 and 128 are available.
Data rate is shown on the display as
SPD=FAST
or
SPD=SLOW
. See
ADC speed
in the
Parameters
section
for further information.
If any of these parameters are changed during a multisample measurement, the measurement is
restarted.
Raw: In this measurement, codes are read from the ADS1230 and displayed. No processing or analysis is
done on the sample stream. Data can be displayed as hexadecimal codes, decimal codes, or volts.
Voltage is calculated according to
Equation 3
:
Where:
•
A is the converter gain (64 or 128), determined from the programmed gain setting
•
v
REF
is the voltage at the converter reference input
•
x is the ADC decimal code
v
REF
is adjustable from Configuration mode. By default, it is 5V.
SBAU125A – August 2007 – Revised September 2007
ADS1230REF User's Guide
11
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