Section 8. Operation
383
The conclusion follows that the common-mode range is not a fixed number, but
instead decreases with increasing differential voltage. For differential voltages
that are small compared to the input limits, common-mode range is essentially
equivalent to Input Limits. Yet for a 5000 mV differential signal, the common-
mode range is reduced to ±2.5 Vdc, whereas Input Limits are always ±5 Vdc.
Consequently, the term Input Limits is used to specify the valid voltage range of
the V+ and V– inputs into the PGIA.
FIGURE 88: PGIA with Input Signal Decomposition
8.1.2.7.2 Voltage Measurement Mechanics
Measurement Sequence
An analog voltage measurement as illustrated in the figure Simplified Voltage
Measurement Sequence
(p. 383),
proceeds as follows:
1. Switch
2. Settle
3. Amplify
4. Integrate
5. A to D (successive approximation)
6. Measurement scaled with multiplier and offset
7.
Scaled value placed in memory
FIGURE 89: Simplified voltage measurement sequence.
Summary of Contents for CR3000 Micrologger
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