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ADC0833 Просмотр технического описания (PDF) - National ->Texas Instruments

Номер в каталогеADC0833 National-Semiconductor
National ->Texas Instruments National-Semiconductor
Компоненты Описание8-Bit Serial I/O A/D Converter with 4-Channel Multiplexer
ADC0833 Datasheet PDF : 20 Pages
1 2 3 4 5 6 7 8 9 10 Next Last
Timing Diagram
Functional Description
1 0 MULTIPLEXER ADDRESSING
The design of the ADC0833 utilizes a sample-data compar-
ator structure which provides for a differential analog input
to be converted by a successive approximation routine
The actual voltage converted is always the difference be-
tween an assigned ‘‘a’’ input terminal and a ‘‘b’’ input ter-
minal The polarity of each input terminal of the pair being
converted indicates which line the converter expects to be
the most positive If the assigned ‘‘a’’ input is less than the
‘‘b’’ input the converter responds with an all zeros output
code
A unique input multiplexing scheme has been utilized to pro-
vide multiple analog channels with software-configurable
single-ended (ground referred) or differential inputs The an-
alog signal conditioning required in transducer-based data
TL H 5607 – 5
acquisition systems is significantly simplified with this type
of input flexibility One converter package can now handle
ground referenced inputs and true differential inputs
A particular input configuration is assigned during the MUX
addressing sequence prior to the start of a conversion The
MUX address selects which of the analog inputs are to be
enabled and whether this input is single-ended or differen-
tial In the differential case it also assigns the polarity of the
channels Differential inputs are restricted to adjacent chan-
nel pairs For example channel 0 and channel 1 may be
selected as a differential pair Channel 0 or 1 cannot act
differentially with any other channel In addition to selecting
differential mode the sign may also be selected Channel 0
may be selected as the positive input and channel 1 as the
negative input or vice versa This programmability is best
illustrated by the MUX addressing codes shown in the fol-
lowing table The MUX address is shifted into the converter
through the DI line
TABLE I MUX Addressing
Single-Ended MUX Mode
Address
SGL
ODD
SELECT
DIF
SIGN
1
0
1
0
0
1
1
0
1
1
1
1
0
1
1
1
1
1
Channel
0
1
2
3
a
a
a
a
COM is internally ties to a GND
Differential MUX Mode
Address
SGL
ODD
SELECT
DIF
SIGN
1
0
0
0
0
1
0
0
1
1
0
1
0
1
0
1
1
1
Channel
0
1
2
3
a
b
a
b
b
a
b
a
9
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