LTC1290CIJ Linear Technology, LTC1290CIJ Datasheet - Page 12

• Manufacturer Part Number: LTC1290CIJ
• Description: 12-BIT SERIAL I/O ADC W/8 CH MUX
• Manufacturer: Linear Technology
• Type: Data Acquisition System (DAS), ADCr

Specifications of LTC1290CIJ

• Resolution (bits): 12 b
• Sampling Rate (per Second): 50k
• Data Interface: Serial, Parallel
• Voltage Supply Source: Dual ±
• Voltage - Supply: ±5V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Through Hole
• Package / Case: *
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

LTC1290
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
12
A
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
PPLICATI
OUTPUT CODE
Unipolar Output Code (UNI = 1)
•
•
•
O
INPUT VOLTAGE
V
V
0 1 1 1 1 1 1 1 1 1 1 1
0 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
REF
REF
U
1LSB
OUTPUT CODE
0V
– 1LSB
– 2LSB
S
•
•
•
•
•
•
I FOR ATIO
U
INPUT VOLTAGE
(V
4.9988V
4.9976V
0.0012V
REF
0V
INPUT VOLTAGE
•
•
•
= 5V)
V
V
LTC1290 • AI04a
W
REF
REF
1LSB
0V
– 1LSB
– 2LSB
•
•
•
0 0 0 0 0 0 0 0 0 0 0 1
0 0 0 0 0 0 0 0 0 0 0 0
0 1 1 1 1 1 1 1 1 1 1 1
0 1 1 1 1 1 1 1 1 1 1 0
Bipolar Transfer Curve (UNI = 0)
Bipolar Output Code (UNI = 0)
INPUT VOLTAGE
U
(V
•
•
•
4.9976V
4.9851V
0.0024V
REF
0V
•
•
•
= 5V)
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
1 1 1 1 1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1 1 1 1 0
1 0 0 0 0 0 0 0 0 0 0 1
1 0 0 0 0 0 0 0 0 0 0 0
•
•
•
1 1 1 1 1 1 1 1 1 1 1 1
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 1 1 1 1 1 1 1 1 1 1 0
1 0 0 0 0 0 0 0 0 0 0 1
1 0 0 0 0 0 0 0 0 0 0 0
OUTPUT CODE
Unipolar Transfer Curve (UNI = 1)
•
•
•
•
•
•
INPUT VOLTAGE
–(V
REF
– (V
–2LSB
–1LSB
) + 1LSB
•
•
•
REF
)
INPUT VOLTAGE
(V
–0.0024V
–0.0048V
–4.9976V
–5.0000V
REF
•
•
•
= 5V)
LTC1290 AI05a
LTC1290 AI05b
V
IN
LTC1290 AI04b
1290fe
V
IN