LTC2301/LTC2305
1-/2-Channel, 12-Bit ADCs
2
with I C Compatible Interface
FEATURES
DESCRIPTION
The LTC®2301/LTC2305 are low noise, low power, 1-/2-
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12-Bit Resolution
2
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Low Power: 1.5mW at 1ksps, 35μW Sleep Mode
channel,12-bitsuccessiveapproximationADCswithanI C
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14ksps Throughput Rate
compatibleserialinterface.TheseADCsincludeaninternal
reference and a fully differential sample-and-hold circuit
to reduce common-mode noise. The LTC2301/LTC2305
operate from an internal clock to achieve a fast 1.3μs
conversion time.
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Internal Reference
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Low Noise: SNR = 73.5dB
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Guaranteed No Missing Codes
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Single 5V Supply
2
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2-wire I C Compatible Serial Interface with 9
The LTC2301/LTC2305 operate from a single 5V supply
and draw just 300μA at a throughput rate of 1ksps. The
ADC enters nap mode when not converting, reducing the
power dissipation.
Addresses Plus One Global for Synchronization
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Fast Conversion Time: 1.3ꢀs
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1-Channel (LTC2301) and 2-Channel (LTC2305)
Versions
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The LTC2301/LTC2305 are available in small 12-pin
4mm × 3mm DFN and 12-pin MSOP packages. The in-
ternal 2.5V reference further reduces PCB board space
requirements.
Unipolar or Bipolar Input Ranges (Software
Selectable)
Internal Conversion Clock
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Guaranteed Operation from –40°C to 125°C
(MSOP Package)
The low power consumption and small size make the
LTC2301/LTC2305 ideal for battery operated and portable
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12-Pin 4mm × 3mm DFN and 12-Pin MSOP
Packages
2
applications,whilethe2-wireI Ccompatibleserialinterface
makes these ADCs a good match for space-constrained
systems.
APPLICATIONS
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Industrial Process Control
2
12-Bit I C ADC Famly
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Motor Control
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Input Channels
Part Number
1
2
8
Accelerometer Measurements
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LTC2301
LTC2305
LTC2309
Battery Operated Instruments
Isolated and/or Remote Data Acquisition
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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.
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Power Supply Monitoring
BLOCK DIAGRAM
Integral Nonlinearity vs Output Code (LTC2305)
5V
1.00
10μF
V
0.1μF
0.75
AD1
AD0
LTC2301
LTC2305
DD
0.50
0.25
+
+
–
CH0(IN )
ANALOG
INPUT
MUX
12-BIT
SCL
SDA
2
ANALOG INPUT
0V TO 4.096V UNIPOLAR
2.048V BIPOLAR
I C
0.00
SAR ADC
+
PORT
CH1(IN )
–0.25
–0.50
–0.75
–1.00
V
REF
INTERNAL
2.5V REF
2.2μF
PIN NAMES IN PARENTHESES
REFER TO LTC2301
REFCOMP
10μF
0
1024
2048
3072
4096
GND
0.1μF
OUTPUT CODE
23015 TA01a
23015 TA01b
23015f
1