ltc1867l Linear Technology Corporation, ltc1867l Datasheet - Page 9

• Manufacturer Part Number: ltc1867l
• Description: Ltc1863l - Micropower, 3v, 12-bit, 8-channel 175ksps Adcs
• Manufacturer: Linear Technology Corporation

APPLICATIO S I FOR ATIO
APPLICATIO S I FOR ATIO
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
UNI = UNIPOLAR/BIPOLAR BIT
SLP = SLEEP MODE BIT
+
–
+
–
+
–
+
–
(
(
(
(
(
(
(
(
–
+
–
+
–
+
–
+
)
)
)
)
)
)
)
)
+
+
+
+
+
+
+
{
{
{
{
7 Single-Ended
4 Differential
to CH7/COM
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7/COM
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7/COM (
Examples of Multiplexer Options
U
U
–
)
U
U
Combinations of Differential
+
–
–
+
+
+
+
+
+
+
+
+
+
+
+
+
{
{
8 Single-Ended
and Single-Ended
W
W
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7/COM
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7/COM
GND (
GND (
–
–
)
)
1863L7L AI01
U
U
Tables 1 and 2 show the configurations when COM = 0,
and COM = 1.
Table 1. Channel Configuration (When COM = 0, CH7/COM Pin
Is Used as CH7)
Table 2. Channel Configuration (When COM = 1, CH7/COM Pin
Is Used as COMMON)
SD
SD
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
+
+
–
–
{
{
OS
OS
Changing the MUX Assignment “On the Fly”
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1st Conversion
CH2
CH3
CH4
CH5
CH7/COM
(UNUSED)
S1
S1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
LTC1863L/LTC1867L
S0
S0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
COM
COM
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
–
+
+
+
{
{
Channel Configuration
Channel Configuration
CH0
CH2
CH4
CH6
CH1
CH3
CH5
CH7
CH0
CH2
CH4
CH6
CH1
CH3
CH5
CH7
CH0
CH2
CH4
CH6
CH1
CH3
CH5
“+”
"+"
2nd Conversion
CH7/COM (
CH2
CH3
CH4
CH5
1863L7L AI02
–
CH7/COM
CH7/COM
CH7/COM
CH7/COM
CH7/COM
CH7/COM
CH7/COM
)
GND
GND
GND
GND
GND
GND
GND
GND
CH1
CH3
CH5
CH7
CH0
CH2
CH4
CH6
“–”
"–"
1863l7lfa
9