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ADC0848CCN Datenblatt(PDF) 11 Page - Texas Instruments

Teilenummer ADC0848CCN
Bauteilbeschribung  ADC0844/ADC0848 8-Bit 關P Compatible A/D Converters with Multiplexer Options
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ADC0844, ADC0848
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SNAS523D – JUNE 1999 – REVISED MARCH 2013
THE ANALOG INPUTS
Analog Differential Voltage Inputs and Common-Mode Rejection
The differential input of these converters actually reduces the effects of common-mode input noise, a signal
common to both selected “+” and “
−” inputs for a conversion (60 Hz is most typical). The time interval between
sampling the “+” input and then the “
−” inputs is ½ of a clock period. The change in the common-mode voltage
during this short time interval can cause conversion errors. For a sinusoidal common-mode signal this error is:
where
fCM is the frequency of the common-mode signal
Vpeak is its peak voltage value
tC is the conversion time
For a 60 Hz common-mode signal to generate a ¼ LSB error (
≈5 mV) with the converter running at 40 μS, its
peak value would have to be 5.43V. This large a common-mode signal is much greater than that generally found
in a well designed data acquisition system.
Table 2. ADC0848 MUX Addressing(1)
MUX Address
Channel
CS
WR
RD
MUX Mode
MA4
MA3
MA2
MA1
MA0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
CH8
AGND
X
L
L
L
L
L
H
+
X
L
L
L
H
L
H
+
X
L
L
H
L
L
H
+
X
L
L
H
H
L
NP
H
+
Differential
X
L
H
L
L
L
H
+
X
L
H
L
H
L
H
+
X
L
H
H
L
L
H
+
X
L
H
H
H
L
H
+
L
H
L
L
L
L
H
+
L
H
L
L
H
L
H
+
L
H
L
H
L
L
H
+
L
H
L
H
H
L
NP
H
+
Single-Ended
L
H
H
L
L
L
H
+
L
H
H
L
H
L
H
+
L
H
H
H
L
L
H
+
L
H
H
H
H
L
H
+
H
H
L
L
L
L
H
+
H
H
L
L
H
L
H
+
H
H
L
H
L
L
H
+
Pseudo-
H
H
L
H
H
L
NP
H
+
Differential
H
H
H
L
L
L
H
+
H
H
H
L
H
L
H
+
H
H
H
H
L
L
H
+
X
X
X
X
X
L
L
Previous Channel Configuration
(1)
X = don't care, NP = negative pulse
Copyright © 1999–2013, Texas Instruments Incorporated
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