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ManualsBrandsLINEAR TECHNOLOGY ManualsData collecting ICsData acquisition IC - ADC 10 Bit PDIP 8
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15
LTC1091/LTC1092
LTC1093/LTC1094
U
S
A
O
PP
L
IC
AT
I
WU
U
I FOR ATIO
Unipolar Transfer Curve (UNI = 1)
MSB-First/LSB-First (MSBF)
The output data of the LTC1091/LTC1093/LTC1094 is
programmed for MSB-first or LSB-first sequence using
the MSBF bit. When the MSBF bit is a logical one, data will
appear on the D
OUT
line in MSB-first format. Logical zeros
will be filled in indefinitely following the last data bit to
accommodate longer word lengths required by some
microprocessors. When the MSBF bit is a logical zero,
LSB-first data will follow the normal MSB-first data on the
D
OUT
line. (See operating sequence).
Unipolar/Bipolar (UNI)
The UNI bit of the LTC1093/LTC1094 determines whether
the conversion will be unipolar or bipolar. When UNI is a
logical one, a unipolar conversion will be performed on the
selected input voltage. When UNI is a logical zero, a bipolar
conversion will result. The input span and code assign-
ment for each conversion type are shown in the figures
below.
The LTC1091/LTC1092 are permanently configured for
unipolar mode.
0V
1LSB
V
REF
– 2LSB
V
REF
– 1LSB
V
REF
V
IN
0 0 0 0 0 0 0 0 0 1
0 0 0 0 0 0 0 0 0 0
1 1 1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1 1 0
1091-4 AI11
1LSB
V
REF
– 2LSB
V
REF
– 1LSB
V
REF
V
IN
1 1 1 1 1 1 1 1 1 1
0 0 0 0 0 0 0 0 0 1
0 0 0 0 0 0 0 0 0 0
0 1 1 1 1 1 1 1 1 0
0 1 1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1 1 0
1 0 0 0 0 0 0 0 0 1
1 0 0 0 0 0 0 0 0 0
–1LSB
–2LSB
–V
REF
–V
REF
+ 1LSB
1091-4 AI12
OUTPUT CODE
1 1 1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1 1 0
•
•
•
0 0 0 0 0 0 0 0 0 1
0 0 0 0 0 0 0 0 0 0
INPUT VOLTAGE
V
REF
– 1LSB
V
REF
– 2LSB
•
•
•
1LSB
0V
INPUT VOLTAGE
(V
REF
= 5V)
4.9951V
4.9902V
•
•
•
0.0049V
0V
1091-4AI13
Bipolar Transfer Curve (UNI = 0) LTC1093/LTC1094 Only
Unipolar Output Code (UNI = 1)
OUTPUT CODE
0 1 1 1 1 1 1 1 1 1
0 1 1 1 1 1 1 1 1 0
•
•
•
0 0 0 0 0 0 0 0 0 1
0 0 0 0 0 0 0 0 0 0
1 1 1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1 1 0
•
•
•
1 0 0 0 0 0 0 0 0 1
1 0 0 0 0 0 0 0 0 0
INPUT VOLTAGE
V
REF
– 1LSB
V
REF
– 2LSB
•
•
•
1LSB
0V
–1LSB
–2LSB
•
•
•
–(V
REF
) + 1LSB
–(V
REF
)
INPUT VOLTAGE
(V
REF
= 5V)
4.9902V
4.9805V
•
•
•
0.0098V
0V
–0.0098V
–0.0195V
•
•
•
–4.9902V
–5.000V
1091-4AI14
Bipolar Output Code (UNI = 0) LTC1093/LTC1094 Only