8
LTC1091/LTC1092
LTC1093/LTC1094
LTC1092/LTC1093/LTC1094
Reference Current vs Temperature
AMBIENT TEMPERATURE (°C)
–50
REFERENCE CURRENT (mA)
0.6
0.5
0.4
0.3
0.2
0.1
0
50
1091/2/3/4 G28
–25
0
25
75
125100
V
REF
= 5V
AMBIENT TEMPERATURE (°C)
–50
0
INPUT CHANNEL LEAKAGE CURRENT (nA)
100
300
400
500
1000
700
0
25
50 125
1091/2/3/4 G29
200
800
900
600
–25
75
100
ON-CHANNEL
OFF-CHANNEL
GUARANTEED
LTC1093/LTC1094 Input Channel
Leakage Current vs Temperature
PI FU CTIO S
U
UU
LTC1091/LTC1092
CS (Pin 1): Chip Select Input. A logic low on this input
enables the LTC1091/LTC1092.
CH0, CH1/+IN, –IN (Pins 2, 3): Analog Inputs. These
inputs must be free of noise with respect to GND.
GND (Pin 4): Analog Ground. GND should be tied directly
to an analog ground plane.
D
IN
(Pin 5)(LTC1091): Digital Data Input. The multiplexer
address is shifted into this input.
V
REF
(Pin 5)(LTC1092): Reference Input. The reference
input defines
the span of the A/D converter and must be
kept free of noise with respect to AGND.
D
OUT
(Pin 6): Digital Data Output. The A/D conversion
result is shifted out of this output.
CLK (Pin 7): Shift Clock. This clock synchronizes the serial
data transfer.
V
CC
(V
REF
)(Pin 8)(LTC1091): Positive Supply and Refer-
ence Voltage. This pin provides power and defines the
span of the A/D converter. It must be kept free of noise and
ripple by bypassing directly to the analog ground plane.
V
CC
(Pin 8 )(LTC1092): Positive Supply Voltage. This pin
provides power to the A/D converter. It must be kept free
of noise and ripple by bypassing directly to the analog
ground plane.
LTC1093/LTC1094
CH0 to CH5/CH0 to CH7 (Pins 1 to 6/Pins 1 to 8): Analog
Inputs. The analog inputs must be free of noise with
respect to AGND.
COM (Pin 7/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 8/Pin 10): Digital Ground. This is the ground
for the internal logic. Tie to the ground plane.
V
–
(Pin 9/Pin 11): Negative Supply. Tie V
–
to most
negative potential in the circuit. (Ground in single supply
applications.)
AGND (Pin 10/Pin 12): Analog Ground. AGND should be
tied directly to the analog ground plane.
CCHARA TERIST
ICS
UW
AT
Y
P
I
CA
LPER
F
O
R
C
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