LTC1863CGN Ver la hoja de datos (PDF) - Linear Technology
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LTC1863CGN Datasheet PDF : 18 Pages
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LTC1863/LTC1867
APPLICATIONS INFORMATION
Analog Input Multiplexer
The analog input multiplexer is controlled by a 7-bit input
data word. The input data word is defined as follows:
SD OS S1 S0 COM UNI SLP
SD = SINGLE/DIFFERENTIAL BIT
OS = ODD/SIGN BIT
S1 = ADDRESS SELECT BIT 1
S0 = ADDRESS SELECT BIT 0
COM = CH7/COM CONFIGURATION BIT
Changing the MUX Assignment “On the Fly”
1st Conversion
2nd Conversion
+
–
{
CH2
CH3
+
–
{
CH4
CH5
CH7/COM
(UNUSED)
–
+
{
CH2
CH3
+
+
{
CH4
CH5
CH7/COM (–)
18637 AI02
Tables 1 and 2 show the configurations when COM = 0,
and COM = 1.
UNI = UNIPOLAR/BIPOLAR BIT
SLP = SLEEP MODE BIT
Examples of Multiplexer Options
4 Differential
+
–
(–)
(+)
{
+
–
(–)
(+)
{
+
–
(–)
(+)
{
+
–
(–)
(+)
{
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7/COM
8 Single-Ended
+
CH0
+
CH1
+
CH2
+
CH3
+
CH4
+
CH5
+
CH6
+
CH7/COM
GND (–)
7 Single-Ended
to CH7/COM
+
CH0
+
CH1
+
CH2
+
CH3
+
CH4
+
CH5
+
CH6
CH7/COM (–)
Combinations of Differential
and Single-Ended
+
–
{
CH0
CH1
–
+
{
CH2
CH3
+
CH4
+
CH5
+
CH6
+
CH7/COM
GND (–)
18637 AI01
Table 1. Channel Configuration (When COM = 0, CH7/COM Pin
Is Used as CH7)
SD OS S1 S0 COM
Channel Configuration
“+”
“–”
0
0
0
0
0
CH0
CH1
0
0
0
1
0
CH2
CH3
0
0
1
0
0
CH4
CH5
0
0
1
1
0
CH6
CH7
0
1
0
0
0
CH1
CH0
0
1
0
1
0
CH3
CH2
0
1
1
0
0
CH5
CH4
0
1
1
1
0
CH7
CH6
1
0
0
0
0
CH0
GND
1
0
0
1
0
CH2
GND
1
0
1
0
0
CH4
GND
1
0
1
1
0
CH6
GND
1
1
0
0
0
CH1
GND
1
1
0
1
0
CH3
GND
1
1
1
0
0
CH5
GND
1
1
1
1
0
CH7
GND
Table 2. Channel Configuration (When COM = 1, CH7/COM Pin
Is Used as COMMON)
Channel Configuration
SD OS S1 S0 COM
“+”
“–”
1
0
0
0
1
CH0
CH7/COM
1
0
0
1
1
CH2
CH7/COM
1
0
1
0
1
CH4
CH7/COM
1
0
1
1
1
CH6
CH7/COM
1
1
0
0
1
CH1
CH7/COM
1
1
0
1
1
CH3
CH7/COM
1
1
1
0
1
CH5
CH7/COM
10
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18637fc
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