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LTC1867IGN Datasheet(PDF) 9 Page - Linear Technology

Part # LTC1867IGN
Description  12-/16-Bit, 8-Channel 200ksps ADCs
PDF  16 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1867IGN Datasheet(HTML) 9 Page - Linear Technology

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LTC1863/LTC1867
9
18637f
APPLICATIO S I FOR ATIO
Examples of Multiplexer Options
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7/COM
GND (
–)
8 Single-Ended
+
+
+
+
+
+
+
4 Differential
+ (–)
+
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7/COM (
–)
7 Single-Ended
to CH7/COM
+
+
+
+
+
+
+
+ (–)
+ (–)
+ (–)
– (+)
– (+)
– (+)
– (+)
GND (
–)
Combinations of Differential
and Single-Ended
+
+
+
+
+
+
–
–
{
{
{
{
{
{
18637 AI01
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7/COM
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7/COM
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
APPLICATIO S I FOR ATIO
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)
Channel Configuration
SD
OS
S1
S0
COM
“+”
“-”
00000
CH0
CH1
00010
CH2
CH3
00100
CH4
CH5
00110
CH6
CH7
01000
CH1
CH0
01010
CH3
CH2
01100
CH5
CH4
01110
CH7
CH6
10000
CH0
GND
10010
CH2
GND
10100
CH4
GND
10110
CH6
GND
11000
CH1
GND
11010
CH3
GND
11100
CH5
GND
11110
CH7
GND
Table 2. Channel Configuration (When COM = 1, CH7/COM Pin
Is Used as COMMON)
Channel Configuration
SD
OS
S1
S0
COM
"+"
"-"
10001
CH0
CH7/COM
10011
CH2
CH7/COM
10101
CH4
CH7/COM
10111
CH6
CH7/COM
11001
CH1
CH7/COM
11011
CH3
CH7/COM
11101
CH5
CH7/COM
Changing the MUX Assignment “On the Fly”
CH7/COM
(UNUSED)
CH7/COM (
–)
1st Conversion
2nd Conversion
+
–
+
–
+
–
+
+
{
{
{
{
CH2
CH3
CH4
CH5
CH2
CH3
CH4
CH5
18637 AI02



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