LTC1096/LTC1096L
LTC1098/LTC1098L
1
10968fc
TYPICAL APPLICATION
DESCRIPTION
Micropower Sampling
8-Bit Serial I/O A/D Converters
The LTC
®
1096/LTC1096L/LTC1098/LTC1098L are
micropower, 8-bit A/D converters that draw only 80μA of
supply current when converting. They automatically power
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, successive approximation ADCs
include sample-and-hold. The LTC1096/LTC1096L have a
single differential analog input. The LTC1098/LTC1098L
offer a software selectable 2-channel MUX.
On-chip serial ports allow effi cient data transfer to a wide
range of microprocessors and microcontrollers over three
wires. This, coupled with micropower consumption, makes
remote location possible and facilitates transmitting data
through isolation barriers.
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.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
FEATURES
APPLICATIONS
n
80μA Maximum Supply Current
n
1nA Typical Supply Current in Shutdown
n
5V Operation (LTC1096/LTC1098)
n
3V Operation (LTC1096L/LTC1098L)(2.65V Min)
n
Sample-and-Hold
n
16μs Conversion Time
n
33kHz Sample Rate
n
±0.5LSB Total Unadjusted Error Over Temp
n
Direct 3-Wire Interface to Most MPU Serial Ports and
All MPU Parallel I/O Ports
n
8-Pin SO Plastic Package
n
Battery-Operated Systems
n
Remote Data Acquisition
n
Battery Monitoring
n
Battery Gas Gauges
n
Temperature Measurement
n
Isolated Data Acquisition
Supply Current vs Sample Rate10μW, S8 Package, 8-Bit A/D
Samples at 200Hz and Runs Off a 5V Battery
5V1μF
ANALOG INPUT
0V TO 5V RANGE
–IN
GND
V
CC
CLK
D
OUT
V
REF
LTC1096
MPU
(e.g., 8051)
P1.4
P1.3
P1.2
+IN
10968 TA01
CS/
SHUTDOWN
SAMPLE FREQUENCY, f
SMPL
(kHz)
0.1
1
SUPPLY CURRENT, I
CC
(μA)
10
100
1000
1 10 100
10968 TA02
T
A
= 25°C
V
CC
= V
REF
= 5V
