LTC1290BI LINER [Linear Technology], LTC1290BI Datasheet - Page 6

• Manufacturer Part Number: LTC1290BI
• Description: Single Chip 12-Bit Data Acquisition System
• Manufacturer: LINER [Linear Technology]

LTC1290
TYPICAL PERFOR
PI FU CTIO S
CH0 to CH7 (Pin 1 to Pin 8): Analog Inputs. The analog
inputs must be free of noise with respect to AGND.
COM (Pin 9): Common. The common pin defines the zero
reference point for all single-ended inputs. It must be free
of noise and is usually tied to the analog ground plane.
DGND (Pin 10): Digital Ground. This is the ground for the
internal logic. Tie to the ground plane.
AGND (Pin 11): Analog Ground. AGND should be tied
directly to the analog ground plane.
6
100
10
U
1
Sample-and-Hold Acquisition
Time vs Source Resistance
V
V
T
0V TO 5V INPUT STEP
V
REF
CC
A
IN
100
= 25 C
= 5V
R
= 5V
SOURCE
U
1000
600
900
800
700
500
400
300
200
100
+
0
–50
+
–
R
Input Channel Leakage Current
vs Temperature
SOURCE
–30
1k
AMBIENT TEMPERATURE, T
U
+ ( )
–10
10
W
LTC1290 • TPC11
30
OFF CHANNEL
A
50
U
10k
ON CHANNEL
GUARANTEED
70
CE
A
90 110
( C)
C
1290 • TPC14
HARA TERISTICS
10
9
8
7
6
5
4
3
2
1
0
130
–50
Supply Current (Power Shutdown)
vs Temperature
ACLK OFF DURING
POWER SHUTDOWN
–30
AMBIENT TEMPERATURE, T
–10
C
10
30
V
potential in the circuit. (Ground in single supply applica-
tions.)
REF
ence inputs must be kept free of noise with respect to
AGND.
CS (Pin 15): Chip Select Input. A logic low on this input
enables data transfer.
D
result is shifted out of this output.
50
OUT
–
(Pin 12): Negative Supply. Tie V
70
–
, REF
(Pin 16): Digital Data Output. The A/D conversion
A
90 110
( C)
2.25
1.75
1.50
1.25
1.00
0.50
2.00
0.75
0.25
1290 • TPC12
0
+
0
Noise Error vs Reference Voltage
(Pins 13, 14): Reference Inputs. The refer-
130
LTC1290 NOISE 200 V
REFERENCE VOLTAGE, V
1
200
180
160
140
120
100
80
60
40
20
2
0
Supply Current (Power Shutdown)
vs ACLK
V
CMOS LEVELS
CC
P-P
= 5V
3
1.00
ACLK FREQUENCY (MHz)
REF
(V)
4
1290 • TPC15
–
to most negative
2.00
5
3.00
1290 • TPC13
4.00