LTC1096/LTC1096L
LTC1098/LTC1098L
Micropower Sampling
8-Bit Serial I/O A/D Converters
FEATURES
DESCRIPTION
The LTC®1096/LTC1096L/LTC1098/LTC1098L are
micropower, 8-bit A/D converters that draw only 80μA of
supplycurrentwhenconverting.Theyautomaticallypower
down to 1nA typical supply current whenever they are not
performing conversions. They are packaged in 8-pin SO
packages and have both 3V (L) and 5V versions. These
8-bit,switched-capacitor,successiveapproximationADCs
include sample-and-hold. The LTC1096/LTC1096L have a
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80μA Maximum Supply Current
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1nA Typical Supply Current in Shutdown
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5V Operation (LTC1096/LTC1098)
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3V Operation (LTC1096L/LTC1098L)(2.65V Min)
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Sample-and-Hold
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16μs Conversion Time
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33kHz Sample Rate
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0.5LSꢀ Total Unadjusted Error Over Temp
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Direct 3-Wire Interface to Most MPU Serial Ports and
All MPU Parallel I/O Ports
single differential analog input. The LTC1098/LTC1098L
offer a software selectable 2-channel MUX.
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8-Pin SO Plastic Package
On-chip serial ports allow efficient data transfer to a wide
rangeofmicroprocessorsandmicrocontrollersoverthree
wires.This,coupledwithmicropowerconsumption,makes
remote location possible and facilitates transmitting data
through isolation barriers.
APPLICATIONS
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ꢀattery-Operated Systems
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Remote Data Acquisition
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ꢀattery Monitoring
ꢀattery Gas Gauges
Temperature Measurement
Isolated Data Acquisition
These circuits can be used in ratiometric applications or
with an external reference. The high impedance analog
inputs and the ability to operate with reduced spans (be-
low 1V full scale) allow direct connection to sensors and
transducers in many applications, eliminating the need
for gain stages.
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L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
10μW, S8 Package, 8-Bit A/D
Supply Current vs Sample Rate
Samples at 200Hz and Runs Off a 5V Battery
1000
T
= 25°C
= V
A
1μF
5V
V
= 5V
CC
REF
MPU
100
10
1
(e.g., 8051)
CS/
SHUTDOWN
V
P1.4
P1.3
P1.2
CC
+IN
CLK
ANALOG INPUT
0V TO 5V RANGE
LTC1096
–IN
D
OUT
GND
V
REF
10968 TA01
0.1
1
SAMPLE FREQUENCY, f
10
100
(kHz)
SMPL
10968 TA02
10968fc
1