Analysis Mode; Modes And Example Displays - Texas Instruments ADS1230REF User Manual

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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.
Raw
RMS
Peak-to-Peak
Averaged
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
The ADS1230 itself can be configured directly from this mode, as described in
3.1 Switch Functions
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
for further information.
If any of these parameters are changed during a multisample measurement, the measurement is
restarted.
3.2 Measurement Modes
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
v
x
REF
v =
·
24
2 1 A
-
Where:
•
A is the converter gain (64 or 128), determined from the programmed gain setting
•
v is the voltage at the converter reference input
REF
•
x is the ADC decimal code
v is adjustable from Configuration mode. By default, it is 5V.
REF
SBAU125A – August 2007 – Revised September 2007
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Table 3. Modes and Example Displays
Hex Code Dec Code
1992E9H +1676001
n/a +5.789
n/a +31.256
n/a +1676001
Equation 3:
Voltage
+499.488M
+17.495N +23.18BIT
+90.293N +21.92BIT
+499.488M
Section 3.2.
Section 3.1.
ADC speed in the Parameters
ADS1230REF User's Guide
Analysis Mode
ENOB
n/a
n/a
section
(3)
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