Linear Technology LTC2305: 12-bit, 2-ch I²C 14ksps ADC (req DC590) DC1444A-B DC1444A-B 数据表
产品代码
DC1444A-B
LTC2301/LTC2305
1
23015fb
BLOCK DIAGRAM
FEATURES
APPLICATIONS
DESCRIPTION
1-/2-Channel, 12-Bit ADCs
with I
2
C Compatible Interface
The LTC
®
2301/LTC2305 are low noise, low power,
1-/2-channel, 12-bit successive approximation ADCs
with an I
with an I
2
C 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.
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.
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.
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 I
LTC2301/LTC2305 ideal for battery operated and portable
applications, while the 2-wire I
2
C compatible serial interface
makes these ADCs a good match for space-constrained
systems.
systems.
12-Bit I
2
C ADC Family
Input Channels
1
2
8
Part Number
LTC2301
LTC2305
LTC2309
Integral Nonlinearity vs Output Code (LTC2305)
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
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
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.
Technology Corporation. All other trademarks are the property of their respective owners.
23015 TA01a
+
–
12-BIT
SAR ADC
ANALOG
INPUT
MUX
ANALOG INPUT
0V TO 4.096V UNIPOLAR
±2.048V BIPOLAR
I
2
C
PORT
INTERNAL
2.5V REF
0.1μF
10μF
2.2μF
V
REF
REFCOMP
SCL
SDA
AD1
AD0
AD0
CH0(IN
+
)
CH1(IN
+
)
PIN NAMES IN PARENTHESES
REFER TO LTC2301
REFER TO LTC2301
10μF
0.1μF
V
DD
LTC2301
LTC2305
LTC2305
GND
5V
OUTPUT CODE
0
INL (LSB)
1.00
0.75
0.25
–0.25
–0.75
0.50
0.00
–0.50
–1.00
2048
1024
3072
23015 TA01b
4096