Datasheet

11
LTC1293/LTC1294/LTC1296
129346fs
U
S
A
O
PP
L
IC
AT
I
WU
U
I FOR ATIO
MUX ADDRESS
SGL/
DIFF
DIFFERENTIAL CHANNEL SELECTION
00 00 +–
00 01 +–
00 10 +–
00 11 + –
01 00 –+
01 01 –+
01 10 –+
01 11 – +
0 1 2 3 4 5 6 7
Table 1a. LTC1294/6 Multiplexer Channel Selection
MUX ADDRESS
SINGLE-ENDED CHANNEL SELECTION
0 1 2 3 4 5 6 7 COM
00 00 + –
00 01 + –
00 10 + –
00 11
01 00 – +
01 01 – +
01 10 – +
01 11
Table 1b. LTC1293 Channel Selection
0 1 2 3 4 5
MUX ADDRESS
Not Used
Not Used
Not Used
Not Used
Unipolar/Bipolar (UNI)
The UNI bit 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 volt-
age. When UNI is a logical zero, a bipolar conversion will
result. The input span and code assignment for each
conversion type are shown in the figures below:
Unipolar Output Code (UNI = 1)
ODD
SIGN
SELECT
1 0
SGL/
DIFF
SELECT
1 0
ODD
SIGN
10 00 + –
10 01 + –
10 10 + –
10 11 + –
11 00 + –
11 01 + –
11 10 + –
11 11 + –
DIFFERENTIAL CHANNEL SELECTION SINGLE-ENDED CHANNEL SELECTIONMUX ADDRESS
SGL/
DIFF
ODD
SIGN
SELECT
1 0
SGL/
DIFF
ODD
SIGN
SELECT
1 0
0 1 2 3 4 5 COM
10 00 + –
10 01 + –
10 10 + –
10 11
11 00 + –
11 01 + –
11 10 + –
11 11
0V 1LSB
V
REF
–2LSB
V
REF
–1LSB
V
REF
V
IN
0 0 0 0 0 0 0 0 0 0 0 1
0 0 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 1 1 1 1 0
•
•
•
LTC1293 AI03b
OUTPUT CODE
1 1 1 1 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 0 0 1
0 0 0 0 0 0 0 0 0 0 0 0
INPUT VOLTAGE
V
REF
– 1LSB
V
REF
– 2LSB
•
•
•
1LSB
0V
INPUT VOLTAGE
(VREF = 5V)
4.9988V
4.9976V
•
•
•
0.0012V
0V
LT
C
12
93
AI
03a
Unipolar Transfer Curve (UNI = 1)