LTC2305_15 Datasheet, PDF (1/26 Pages) Linear Technology – 1-/2-Channel, 12-Bit ADCs with I2C Compatible Interface

LTC2301/LTC2305
1-/2-Channel, 12-Bit ADCs
with I²C Compatible Interface
FEATURES
DESCRIPTION
n _{12-Bit Resolution}
n _{Low Power: 1.5mW at 1ksps, 35μW Sleep Mode}
n _{14ksps Throughput Rate}
n _{Internal Reference}
n _{Low Noise: SNR = 73.5dB}
n _{Guaranteed No Missing Codes}
n _{Single 5V Supply}
n _{2-wire I}²_{C Compatible Serial Interface with 9}
Addresses Plus One Global for Synchronization
n _{Fast Conversion Time: 1.3μs}
n _{1-Channel (LTC2301) and 2-Channel (LTC2305)}
Versions
n _{Unipolar or Bipolar Input Ranges (Software}
Selectable)
n _{Internal Conversion Clock}
n _{Guaranteed Operation from –40°C to 125°C}
(MSOP Package)
n _{12-Pin 4mm × 3mm DFN and 12-Pin MSOP}
Packages
APPLICATIONS
The LTC^®2301/LTC2305 are low noise, low power,
1-/2-channel, 12-bit successive approximation ADCs
with an I²C compatible serial interface. These ADCs include
an internal 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.
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.
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.
The low power consumption and small size make the
LTC2301/LTC2305 ideal for battery operated and portable
applications, while the 2-wire I²C compatible serial interface
makes these ADCs a good match for space-constrained
systems.
n _{Industrial Process Control}
n _{Motor Control}
n _{Accelerometer Measurements}
n _{Battery Operated Instruments}
n _{Isolated and/or Remote Data Acquisition}
n _{Power Supply Monitoring}
12-Bit I²C ADC Family
Input Channels
1
Part Number
LTC2301
2
LTC2305
8
LTC2309
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
BLOCK DIAGRAM
5V
10μF
0.1μF
CH0(IN⁺)
ANALOG INPUT
0V TO 4.096V UNIPOLAR _CH1(IN+₎
±2.048V BIPOLAR
LTC2301
LTC2305
ANALOG
INPUT
MUX
V_DD
+
12-BIT
SAR ADC
–
I²C
PORT
INTERNAL
2.5V REF
AD1
AD0
SCL
SDA
V_REF
2.2μF
PIN NAMES IN PARENTHESES
REFER TO LTC2301
GND
23015 TA01a
0.1μF
Integral Nonlinearity vs Output Code (LTC2305)
1.00
0.75
0.50
0.25
0.00
–0.25
–0.50
–0.75
REFCOMP
10μF
–1.00
0
1024
2048
3072
4096
OUTPUT CODE
23015 TA01b
23015fb
1