LTC1090CN Linear Technology, LTC1090CN Datasheet - Page 11

• Manufacturer Part Number: LTC1090CN
• Description: IC DATA ACQUIS SYS 10BIT 20-DIP
• Manufacturer: Linear Technology
• Type: Data Acquisition System (DAS), ADCr

Specifications of LTC1090CN

• Resolution (bits): 10 b
• Sampling Rate (per Second): 30k
• Data Interface: Serial
• Voltage Supply Source: Dual ±
• Voltage - Supply: 5V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Through Hole
• Package / Case: 20-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

APPLICATIO S I FOR ATIO
Unipolar/Bipolar (UNI)
The fifth input bit (UNI) determines whether the conver-
sion will be unipolar or bipolar. When UNI is a logical one,
a unipolar conversion will be performed on the selected
CHANNEL
0,1
2,3
4,5
6,7
4 Differential
+ ( – )
– ( + )
+ ( – )
– ( + )
+ ( – )
– ( + )
+ ( – )
– ( + )
U
LTC1090 • AI04A
U
–V
4,5
6,7
–V
REF
REF
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
Figure 1. Examples of Multiplexer Options on the LTC1090
+1LSB
W
1ST CONVERSION
COM (UNUSED)
+
–
+
–
Changing the MUX Assignment “On the Fly”
LTC1090 • AI04D
OV
CHANNEL
Unipolar Transfer Curve (UNI = 1)
Bipolar Transfer Curve (UNI = 0)
0 0 0 0 0 0 0 0 0 1
0 0 0 0 0 0 0 0 0 0
U
1LSB
0
1
2
3
4
5
6
7
0 1 1 1 1 1 1 1 1 1
0 1 1 1 1 1 1 1 1 0
–2LSB
8 Single Ended
COM ( – )
+
+
+
+
+
+
+
+
–1LSB
LTC1090 • AI04B
5,4
input voltage. When UNI is a logical zero, a bipolar conver-
sion will result. The input span and code assignment for
each conversion type are shown in the figures below.
1 0 0 0 0 0 0 0 0 1
1 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
6
7
1LSB
V
REF
– 2LSB
V
2ND CONVERSION
REF
COM (
–
+
+
+
– 1LSB
–
V
)
REF
LTC1090 • AI04E
Combinations of Differential and Single Ended
V
REF
LTC1090 • AI05
V
– 2LSB
IN
V
REF
– 1LSB
CHANNEL
0,1
2,3
4
5
6
7
V
REF
LTC1090 • AI06
COM (
+
–
–
+
+
+
+
+
V
IN
–
LTC1090 • AI04C
)
LTC1090
11
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